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diff --git a/src/third_party/boost-1.69.0/boost/asio/detail/config.hpp b/src/third_party/boost-1.69.0/boost/asio/detail/config.hpp
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+++ b/src/third_party/boost-1.69.0/boost/asio/detail/config.hpp
@@ -0,0 +1,1454 @@
+//
+// detail/config.hpp
+// ~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_DETAIL_CONFIG_HPP
+#define BOOST_ASIO_DETAIL_CONFIG_HPP
+
+#if defined(BOOST_ASIO_STANDALONE)
+# define BOOST_ASIO_DISABLE_BOOST_ARRAY 1
+# define BOOST_ASIO_DISABLE_BOOST_ASSERT 1
+# define BOOST_ASIO_DISABLE_BOOST_BIND 1
+# define BOOST_ASIO_DISABLE_BOOST_CHRONO 1
+# define BOOST_ASIO_DISABLE_BOOST_DATE_TIME 1
+# define BOOST_ASIO_DISABLE_BOOST_LIMITS 1
+# define BOOST_ASIO_DISABLE_BOOST_REGEX 1
+# define BOOST_ASIO_DISABLE_BOOST_STATIC_CONSTANT 1
+# define BOOST_ASIO_DISABLE_BOOST_THROW_EXCEPTION 1
+# define BOOST_ASIO_DISABLE_BOOST_WORKAROUND 1
+#else // defined(BOOST_ASIO_STANDALONE)
+# include <boost/config.hpp>
+# include <boost/version.hpp>
+# define BOOST_ASIO_HAS_BOOST_CONFIG 1
+#endif // defined(BOOST_ASIO_STANDALONE)
+
+// Default to a header-only implementation. The user must specifically request
+// separate compilation by defining either BOOST_ASIO_SEPARATE_COMPILATION or
+// BOOST_ASIO_DYN_LINK (as a DLL/shared library implies separate compilation).
+#if !defined(BOOST_ASIO_HEADER_ONLY)
+# if !defined(BOOST_ASIO_SEPARATE_COMPILATION)
+# if !defined(BOOST_ASIO_DYN_LINK)
+# define BOOST_ASIO_HEADER_ONLY 1
+# endif // !defined(BOOST_ASIO_DYN_LINK)
+# endif // !defined(BOOST_ASIO_SEPARATE_COMPILATION)
+#endif // !defined(BOOST_ASIO_HEADER_ONLY)
+
+#if defined(BOOST_ASIO_HEADER_ONLY)
+# define BOOST_ASIO_DECL inline
+#else // defined(BOOST_ASIO_HEADER_ONLY)
+# if defined(_MSC_VER) || defined(__BORLANDC__) || defined(__CODEGEARC__)
+// We need to import/export our code only if the user has specifically asked
+// for it by defining BOOST_ASIO_DYN_LINK.
+# if defined(BOOST_ASIO_DYN_LINK)
+// Export if this is our own source, otherwise import.
+# if defined(BOOST_ASIO_SOURCE)
+# define BOOST_ASIO_DECL __declspec(dllexport)
+# else // defined(BOOST_ASIO_SOURCE)
+# define BOOST_ASIO_DECL __declspec(dllimport)
+# endif // defined(BOOST_ASIO_SOURCE)
+# endif // defined(BOOST_ASIO_DYN_LINK)
+# endif // defined(_MSC_VER) || defined(__BORLANDC__) || defined(__CODEGEARC__)
+#endif // defined(BOOST_ASIO_HEADER_ONLY)
+
+// If BOOST_ASIO_DECL isn't defined yet define it now.
+#if !defined(BOOST_ASIO_DECL)
+# define BOOST_ASIO_DECL
+#endif // !defined(BOOST_ASIO_DECL)
+
+// Microsoft Visual C++ detection.
+#if !defined(BOOST_ASIO_MSVC)
+# if defined(BOOST_ASIO_HAS_BOOST_CONFIG) && defined(BOOST_MSVC)
+# define BOOST_ASIO_MSVC BOOST_MSVC
+# elif defined(_MSC_VER) && (defined(__INTELLISENSE__) \
+ || (!defined(__MWERKS__) && !defined(__EDG_VERSION__)))
+# define BOOST_ASIO_MSVC _MSC_VER
+# endif // defined(BOOST_ASIO_HAS_BOOST_CONFIG) && defined(BOOST_MSVC)
+#endif // !defined(BOOST_ASIO_MSVC)
+
+// Clang / libc++ detection.
+#if defined(__clang__)
+# if (__cplusplus >= 201103)
+# if __has_include(<__config>)
+# include <__config>
+# if defined(_LIBCPP_VERSION)
+# define BOOST_ASIO_HAS_CLANG_LIBCXX 1
+# endif // defined(_LIBCPP_VERSION)
+# endif // __has_include(<__config>)
+# endif // (__cplusplus >= 201103)
+#endif // defined(__clang__)
+
+// Android platform detection.
+#if defined(__ANDROID__)
+# include <android/api-level.h>
+#endif // defined(__ANDROID__)
+
+// Support move construction and assignment on compilers known to allow it.
+#if !defined(BOOST_ASIO_HAS_MOVE)
+# if !defined(BOOST_ASIO_DISABLE_MOVE)
+# if defined(__clang__)
+# if __has_feature(__cxx_rvalue_references__)
+# define BOOST_ASIO_HAS_MOVE 1
+# endif // __has_feature(__cxx_rvalue_references__)
+# endif // defined(__clang__)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 5)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_MOVE 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 5)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1700)
+# define BOOST_ASIO_HAS_MOVE 1
+# endif // (_MSC_VER >= 1700)
+# endif // defined(BOOST_ASIO_MSVC)
+# if defined(__INTEL_CXX11_MODE__)
+# if defined(__INTEL_COMPILER) && (__INTEL_COMPILER >= 1500)
+# define BOOST_ASIO_HAS_MOVE 1
+# endif // defined(__INTEL_COMPILER) && (__INTEL_COMPILER >= 1500)
+# if defined(__ICL) && (__ICL >= 1500)
+# define BOOST_ASIO_HAS_MOVE 1
+# endif // defined(__ICL) && (__ICL >= 1500)
+# endif // defined(__INTEL_CXX11_MODE__)
+# endif // !defined(BOOST_ASIO_DISABLE_MOVE)
+#endif // !defined(BOOST_ASIO_HAS_MOVE)
+
+// If BOOST_ASIO_MOVE_CAST isn't defined, and move support is available, define
+// BOOST_ASIO_MOVE_ARG and BOOST_ASIO_MOVE_CAST to take advantage of rvalue
+// references and perfect forwarding.
+#if defined(BOOST_ASIO_HAS_MOVE) && !defined(BOOST_ASIO_MOVE_CAST)
+# define BOOST_ASIO_MOVE_ARG(type) type&&
+# define BOOST_ASIO_MOVE_ARG2(type1, type2) type1, type2&&
+# define BOOST_ASIO_MOVE_CAST(type) static_cast<type&&>
+# define BOOST_ASIO_MOVE_CAST2(type1, type2) static_cast<type1, type2&&>
+#endif // defined(BOOST_ASIO_HAS_MOVE) && !defined(BOOST_ASIO_MOVE_CAST)
+
+// If BOOST_ASIO_MOVE_CAST still isn't defined, default to a C++03-compatible
+// implementation. Note that older g++ and MSVC versions don't like it when you
+// pass a non-member function through a const reference, so for most compilers
+// we'll play it safe and stick with the old approach of passing the handler by
+// value.
+#if !defined(BOOST_ASIO_MOVE_CAST)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 1)) || (__GNUC__ > 4)
+# define BOOST_ASIO_MOVE_ARG(type) const type&
+# else // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 1)) || (__GNUC__ > 4)
+# define BOOST_ASIO_MOVE_ARG(type) type
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 1)) || (__GNUC__ > 4)
+# elif defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1400)
+# define BOOST_ASIO_MOVE_ARG(type) const type&
+# else // (_MSC_VER >= 1400)
+# define BOOST_ASIO_MOVE_ARG(type) type
+# endif // (_MSC_VER >= 1400)
+# else
+# define BOOST_ASIO_MOVE_ARG(type) type
+# endif
+# define BOOST_ASIO_MOVE_CAST(type) static_cast<const type&>
+# define BOOST_ASIO_MOVE_CAST2(type1, type2) static_cast<const type1, type2&>
+#endif // !defined(BOOST_ASIO_MOVE_CAST)
+
+// Support variadic templates on compilers known to allow it.
+#if !defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+# if !defined(BOOST_ASIO_DISABLE_VARIADIC_TEMPLATES)
+# if defined(__clang__)
+# if __has_feature(__cxx_variadic_templates__)
+# define BOOST_ASIO_HAS_VARIADIC_TEMPLATES 1
+# endif // __has_feature(__cxx_variadic_templates__)
+# endif // defined(__clang__)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_VARIADIC_TEMPLATES 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1900)
+# define BOOST_ASIO_HAS_VARIADIC_TEMPLATES 1
+# endif // (_MSC_VER >= 1900)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_VARIADIC_TEMPLATES)
+#endif // !defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+// Support deleted functions on compilers known to allow it.
+#if !defined(BOOST_ASIO_DELETED)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_DELETED = delete
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(__clang__)
+# if __has_feature(__cxx_deleted_functions__)
+# define BOOST_ASIO_DELETED = delete
+# endif // __has_feature(__cxx_deleted_functions__)
+# endif // defined(__clang__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1900)
+# define BOOST_ASIO_DELETED = delete
+# endif // (_MSC_VER >= 1900)
+# endif // defined(BOOST_ASIO_MSVC)
+# if !defined(BOOST_ASIO_DELETED)
+# define BOOST_ASIO_DELETED
+# endif // !defined(BOOST_ASIO_DELETED)
+#endif // !defined(BOOST_ASIO_DELETED)
+
+// Support constexpr on compilers known to allow it.
+#if !defined(BOOST_ASIO_HAS_CONSTEXPR)
+# if !defined(BOOST_ASIO_DISABLE_CONSTEXPR)
+# if defined(__clang__)
+# if __has_feature(__cxx_constexpr__)
+# define BOOST_ASIO_HAS_CONSTEXPR 1
+# endif // __has_feature(__cxx_constexr__)
+# endif // defined(__clang__)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 6)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_CONSTEXPR 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 6)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1900)
+# define BOOST_ASIO_HAS_CONSTEXPR 1
+# endif // (_MSC_VER >= 1900)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_CONSTEXPR)
+#endif // !defined(BOOST_ASIO_HAS_CONSTEXPR)
+#if !defined(BOOST_ASIO_CONSTEXPR)
+# if defined(BOOST_ASIO_HAS_CONSTEXPR)
+# define BOOST_ASIO_CONSTEXPR constexpr
+# else // defined(BOOST_ASIO_HAS_CONSTEXPR)
+# define BOOST_ASIO_CONSTEXPR
+# endif // defined(BOOST_ASIO_HAS_CONSTEXPR)
+#endif // !defined(BOOST_ASIO_CONSTEXPR)
+
+// Support noexcept on compilers known to allow it.
+#if !defined(BOOST_ASIO_NOEXCEPT)
+# if !defined(BOOST_ASIO_DISABLE_NOEXCEPT)
+# if defined(BOOST_ASIO_HAS_BOOST_CONFIG) && (BOOST_VERSION >= 105300)
+# define BOOST_ASIO_NOEXCEPT BOOST_NOEXCEPT
+# define BOOST_ASIO_NOEXCEPT_OR_NOTHROW BOOST_NOEXCEPT_OR_NOTHROW
+# elif defined(__clang__)
+# if __has_feature(__cxx_noexcept__)
+# define BOOST_ASIO_NOEXCEPT noexcept(true)
+# define BOOST_ASIO_NOEXCEPT_OR_NOTHROW noexcept(true)
+# endif // __has_feature(__cxx_noexcept__)
+# elif defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_NOEXCEPT noexcept(true)
+# define BOOST_ASIO_NOEXCEPT_OR_NOTHROW noexcept(true)
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
+# elif defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1900)
+# define BOOST_ASIO_NOEXCEPT noexcept(true)
+# define BOOST_ASIO_NOEXCEPT_OR_NOTHROW noexcept(true)
+# endif // (_MSC_VER >= 1900)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_NOEXCEPT)
+# if !defined(BOOST_ASIO_NOEXCEPT)
+# define BOOST_ASIO_NOEXCEPT
+# endif // !defined(BOOST_ASIO_NOEXCEPT)
+# if !defined(BOOST_ASIO_NOEXCEPT_OR_NOTHROW)
+# define BOOST_ASIO_NOEXCEPT_OR_NOTHROW throw()
+# endif // !defined(BOOST_ASIO_NOEXCEPT_OR_NOTHROW)
+#endif // !defined(BOOST_ASIO_NOEXCEPT)
+
+// Support automatic type deduction on compilers known to support it.
+#if !defined(BOOST_ASIO_HAS_DECLTYPE)
+# if !defined(BOOST_ASIO_DISABLE_DECLTYPE)
+# if defined(__clang__)
+# if __has_feature(__cxx_decltype__)
+# define BOOST_ASIO_HAS_DECLTYPE 1
+# endif // __has_feature(__cxx_decltype__)
+# endif // defined(__clang__)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 6)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_DECLTYPE 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 6)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1700)
+# define BOOST_ASIO_HAS_DECLTYPE 1
+# endif // (_MSC_VER >= 1700)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_DECLTYPE)
+#endif // !defined(BOOST_ASIO_HAS_DECLTYPE)
+
+// Support alias templates on compilers known to allow it.
+#if !defined(BOOST_ASIO_HAS_ALIAS_TEMPLATES)
+# if !defined(BOOST_ASIO_DISABLE_ALIAS_TEMPLATES)
+# if defined(__clang__)
+# if __has_feature(__cxx_alias_templates__)
+# define BOOST_ASIO_HAS_ALIAS_TEMPLATES 1
+# endif // __has_feature(__cxx_alias_templates__)
+# endif // defined(__clang__)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_ALIAS_TEMPLATES 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1900)
+# define BOOST_ASIO_HAS_ALIAS_TEMPLATES 1
+# endif // (_MSC_VER >= 1900)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_ALIAS_TEMPLATES)
+#endif // !defined(BOOST_ASIO_HAS_ALIAS_TEMPLATES)
+
+// Standard library support for system errors.
+# if !defined(BOOST_ASIO_DISABLE_STD_SYSTEM_ERROR)
+# if defined(__clang__)
+# if defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# define BOOST_ASIO_HAS_STD_SYSTEM_ERROR 1
+# elif (__cplusplus >= 201103)
+# if __has_include(<system_error>)
+# define BOOST_ASIO_HAS_STD_SYSTEM_ERROR 1
+# endif // __has_include(<system_error>)
+# endif // (__cplusplus >= 201103)
+# endif // defined(__clang__)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 6)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_STD_SYSTEM_ERROR 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 6)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1700)
+# define BOOST_ASIO_HAS_STD_SYSTEM_ERROR 1
+# endif // (_MSC_VER >= 1700)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_STD_SYSTEM_ERROR)
+
+// Compliant C++11 compilers put noexcept specifiers on error_category members.
+#if !defined(BOOST_ASIO_ERROR_CATEGORY_NOEXCEPT)
+# if (BOOST_VERSION >= 105300)
+# define BOOST_ASIO_ERROR_CATEGORY_NOEXCEPT BOOST_NOEXCEPT
+# elif defined(__clang__)
+# if __has_feature(__cxx_noexcept__)
+# define BOOST_ASIO_ERROR_CATEGORY_NOEXCEPT noexcept(true)
+# endif // __has_feature(__cxx_noexcept__)
+# elif defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_ERROR_CATEGORY_NOEXCEPT noexcept(true)
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
+# elif defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1900)
+# define BOOST_ASIO_ERROR_CATEGORY_NOEXCEPT noexcept(true)
+# endif // (_MSC_VER >= 1900)
+# endif // defined(BOOST_ASIO_MSVC)
+# if !defined(BOOST_ASIO_ERROR_CATEGORY_NOEXCEPT)
+# define BOOST_ASIO_ERROR_CATEGORY_NOEXCEPT
+# endif // !defined(BOOST_ASIO_ERROR_CATEGORY_NOEXCEPT)
+#endif // !defined(BOOST_ASIO_ERROR_CATEGORY_NOEXCEPT)
+
+// Standard library support for arrays.
+#if !defined(BOOST_ASIO_HAS_STD_ARRAY)
+# if !defined(BOOST_ASIO_DISABLE_STD_ARRAY)
+# if defined(__clang__)
+# if defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# define BOOST_ASIO_HAS_STD_ARRAY 1
+# elif (__cplusplus >= 201103)
+# if __has_include(<array>)
+# define BOOST_ASIO_HAS_STD_ARRAY 1
+# endif // __has_include(<array>)
+# endif // (__cplusplus >= 201103)
+# endif // defined(__clang__)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_STD_ARRAY 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1600)
+# define BOOST_ASIO_HAS_STD_ARRAY 1
+# endif // (_MSC_VER >= 1600)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_STD_ARRAY)
+#endif // !defined(BOOST_ASIO_HAS_STD_ARRAY)
+
+// Standard library support for shared_ptr and weak_ptr.
+#if !defined(BOOST_ASIO_HAS_STD_SHARED_PTR)
+# if !defined(BOOST_ASIO_DISABLE_STD_SHARED_PTR)
+# if defined(__clang__)
+# if defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# define BOOST_ASIO_HAS_STD_SHARED_PTR 1
+# elif (__cplusplus >= 201103)
+# define BOOST_ASIO_HAS_STD_SHARED_PTR 1
+# endif // (__cplusplus >= 201103)
+# endif // defined(__clang__)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_STD_SHARED_PTR 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1600)
+# define BOOST_ASIO_HAS_STD_SHARED_PTR 1
+# endif // (_MSC_VER >= 1600)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_STD_SHARED_PTR)
+#endif // !defined(BOOST_ASIO_HAS_STD_SHARED_PTR)
+
+// Standard library support for allocator_arg_t.
+#if !defined(BOOST_ASIO_HAS_STD_ALLOCATOR_ARG)
+# if !defined(BOOST_ASIO_DISABLE_STD_ALLOCATOR_ARG)
+# if defined(__clang__)
+# if defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# define BOOST_ASIO_HAS_STD_ALLOCATOR_ARG 1
+# elif (__cplusplus >= 201103)
+# define BOOST_ASIO_HAS_STD_ALLOCATOR_ARG 1
+# endif // (__cplusplus >= 201103)
+# endif // defined(__clang__)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 6)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_STD_ALLOCATOR_ARG 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 6)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1600)
+# define BOOST_ASIO_HAS_STD_ALLOCATOR_ARG 1
+# endif // (_MSC_VER >= 1600)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_STD_ALLOCATOR_ARG)
+#endif // !defined(BOOST_ASIO_HAS_STD_ALLOCATOR_ARG)
+
+// Standard library support for atomic operations.
+#if !defined(BOOST_ASIO_HAS_STD_ATOMIC)
+# if !defined(BOOST_ASIO_DISABLE_STD_ATOMIC)
+# if defined(__clang__)
+# if defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# define BOOST_ASIO_HAS_STD_ATOMIC 1
+# elif (__cplusplus >= 201103)
+# if __has_include(<atomic>)
+# define BOOST_ASIO_HAS_STD_ATOMIC 1
+# endif // __has_include(<atomic>)
+# endif // (__cplusplus >= 201103)
+# endif // defined(__clang__)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_STD_ATOMIC 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1700)
+# define BOOST_ASIO_HAS_STD_ATOMIC 1
+# endif // (_MSC_VER >= 1700)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_STD_ATOMIC)
+#endif // !defined(BOOST_ASIO_HAS_STD_ATOMIC)
+
+// Standard library support for chrono. Some standard libraries (such as the
+// libstdc++ shipped with gcc 4.6) provide monotonic_clock as per early C++0x
+// drafts, rather than the eventually standardised name of steady_clock.
+#if !defined(BOOST_ASIO_HAS_STD_CHRONO)
+# if !defined(BOOST_ASIO_DISABLE_STD_CHRONO)
+# if defined(__clang__)
+# if defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# define BOOST_ASIO_HAS_STD_CHRONO 1
+# elif (__cplusplus >= 201103)
+# if __has_include(<chrono>)
+# define BOOST_ASIO_HAS_STD_CHRONO 1
+# endif // __has_include(<chrono>)
+# endif // (__cplusplus >= 201103)
+# endif // defined(__clang__)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 6)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_STD_CHRONO 1
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ == 6))
+# define BOOST_ASIO_HAS_STD_CHRONO_MONOTONIC_CLOCK 1
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ == 6))
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 6)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1700)
+# define BOOST_ASIO_HAS_STD_CHRONO 1
+# endif // (_MSC_VER >= 1700)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_STD_CHRONO)
+#endif // !defined(BOOST_ASIO_HAS_STD_CHRONO)
+
+// Boost support for chrono.
+#if !defined(BOOST_ASIO_HAS_BOOST_CHRONO)
+# if !defined(BOOST_ASIO_DISABLE_BOOST_CHRONO)
+# if (BOOST_VERSION >= 104700)
+# define BOOST_ASIO_HAS_BOOST_CHRONO 1
+# endif // (BOOST_VERSION >= 104700)
+# endif // !defined(BOOST_ASIO_DISABLE_BOOST_CHRONO)
+#endif // !defined(BOOST_ASIO_HAS_BOOST_CHRONO)
+
+// Some form of chrono library is available.
+#if !defined(BOOST_ASIO_HAS_CHRONO)
+# if defined(BOOST_ASIO_HAS_STD_CHRONO) \
+ || defined(BOOST_ASIO_HAS_BOOST_CHRONO)
+# define BOOST_ASIO_HAS_CHRONO 1
+# endif // defined(BOOST_ASIO_HAS_STD_CHRONO)
+ // || defined(BOOST_ASIO_HAS_BOOST_CHRONO)
+#endif // !defined(BOOST_ASIO_HAS_CHRONO)
+
+// Boost support for the DateTime library.
+#if !defined(BOOST_ASIO_HAS_BOOST_DATE_TIME)
+# if !defined(BOOST_ASIO_DISABLE_BOOST_DATE_TIME)
+# define BOOST_ASIO_HAS_BOOST_DATE_TIME 1
+# endif // !defined(BOOST_ASIO_DISABLE_BOOST_DATE_TIME)
+#endif // !defined(BOOST_ASIO_HAS_BOOST_DATE_TIME)
+
+// Standard library support for addressof.
+#if !defined(BOOST_ASIO_HAS_STD_ADDRESSOF)
+# if !defined(BOOST_ASIO_DISABLE_STD_ADDRESSOF)
+# if defined(__clang__)
+# if defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# define BOOST_ASIO_HAS_STD_ADDRESSOF 1
+# elif (__cplusplus >= 201103)
+# define BOOST_ASIO_HAS_STD_ADDRESSOF 1
+# endif // (__cplusplus >= 201103)
+# endif // defined(__clang__)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 6)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_STD_ADDRESSOF 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 6)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1700)
+# define BOOST_ASIO_HAS_STD_ADDRESSOF 1
+# endif // (_MSC_VER >= 1700)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_STD_ADDRESSOF)
+#endif // !defined(BOOST_ASIO_HAS_STD_ADDRESSOF)
+
+// Standard library support for the function class.
+#if !defined(BOOST_ASIO_HAS_STD_FUNCTION)
+# if !defined(BOOST_ASIO_DISABLE_STD_FUNCTION)
+# if defined(__clang__)
+# if defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# define BOOST_ASIO_HAS_STD_FUNCTION 1
+# elif (__cplusplus >= 201103)
+# define BOOST_ASIO_HAS_STD_FUNCTION 1
+# endif // (__cplusplus >= 201103)
+# endif // defined(__clang__)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 5)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_STD_FUNCTION 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 5)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1700)
+# define BOOST_ASIO_HAS_STD_FUNCTION 1
+# endif // (_MSC_VER >= 1700)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_STD_FUNCTION)
+#endif // !defined(BOOST_ASIO_HAS_STD_FUNCTION)
+
+// Standard library support for type traits.
+#if !defined(BOOST_ASIO_HAS_STD_TYPE_TRAITS)
+# if !defined(BOOST_ASIO_DISABLE_STD_TYPE_TRAITS)
+# if defined(__clang__)
+# if defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# define BOOST_ASIO_HAS_STD_TYPE_TRAITS 1
+# elif (__cplusplus >= 201103)
+# if __has_include(<type_traits>)
+# define BOOST_ASIO_HAS_STD_TYPE_TRAITS 1
+# endif // __has_include(<type_traits>)
+# endif // (__cplusplus >= 201103)
+# endif // defined(__clang__)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 5)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_STD_TYPE_TRAITS 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 5)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1700)
+# define BOOST_ASIO_HAS_STD_TYPE_TRAITS 1
+# endif // (_MSC_VER >= 1700)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_STD_TYPE_TRAITS)
+#endif // !defined(BOOST_ASIO_HAS_STD_TYPE_TRAITS)
+
+// Standard library support for the nullptr_t type.
+#if !defined(BOOST_ASIO_HAS_NULLPTR)
+# if !defined(BOOST_ASIO_DISABLE_NULLPTR)
+# if defined(__clang__)
+# if __has_feature(__cxx_nullptr__)
+# define BOOST_ASIO_HAS_NULLPTR 1
+# endif // __has_feature(__cxx_rvalue_references__)
+# elif defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 6)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_NULLPTR 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 6)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1700)
+# define BOOST_ASIO_HAS_NULLPTR 1
+# endif // (_MSC_VER >= 1700)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_NULLPTR)
+#endif // !defined(BOOST_ASIO_HAS_NULLPTR)
+
+// Standard library support for the C++11 allocator additions.
+#if !defined(BOOST_ASIO_HAS_CXX11_ALLOCATORS)
+# if !defined(BOOST_ASIO_DISABLE_CXX11_ALLOCATORS)
+# if defined(__clang__)
+# if defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# define BOOST_ASIO_HAS_CXX11_ALLOCATORS 1
+# elif (__cplusplus >= 201103)
+# define BOOST_ASIO_HAS_CXX11_ALLOCATORS 1
+# endif // (__cplusplus >= 201103)
+# elif defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_CXX11_ALLOCATORS 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1800)
+# define BOOST_ASIO_HAS_CXX11_ALLOCATORS 1
+# endif // (_MSC_VER >= 1800)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_CXX11_ALLOCATORS)
+#endif // !defined(BOOST_ASIO_HAS_CXX11_ALLOCATORS)
+
+// Standard library support for the cstdint header.
+#if !defined(BOOST_ASIO_HAS_CSTDINT)
+# if !defined(BOOST_ASIO_DISABLE_CSTDINT)
+# if defined(__clang__)
+# if defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# define BOOST_ASIO_HAS_CSTDINT 1
+# elif (__cplusplus >= 201103)
+# define BOOST_ASIO_HAS_CSTDINT 1
+# endif // (__cplusplus >= 201103)
+# endif // defined(__clang__)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 5)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_CSTDINT 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 5)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1700)
+# define BOOST_ASIO_HAS_CSTDINT 1
+# endif // (_MSC_VER >= 1700)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_CSTDINT)
+#endif // !defined(BOOST_ASIO_HAS_CSTDINT)
+
+// Standard library support for the thread class.
+#if !defined(BOOST_ASIO_HAS_STD_THREAD)
+# if !defined(BOOST_ASIO_DISABLE_STD_THREAD)
+# if defined(__clang__)
+# if defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# define BOOST_ASIO_HAS_STD_THREAD 1
+# elif (__cplusplus >= 201103)
+# if __has_include(<thread>)
+# define BOOST_ASIO_HAS_STD_THREAD 1
+# endif // __has_include(<thread>)
+# endif // (__cplusplus >= 201103)
+# endif // defined(__clang__)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_STD_THREAD 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1700)
+# define BOOST_ASIO_HAS_STD_THREAD 1
+# endif // (_MSC_VER >= 1700)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_STD_THREAD)
+#endif // !defined(BOOST_ASIO_HAS_STD_THREAD)
+
+// Standard library support for the mutex and condition variable classes.
+#if !defined(BOOST_ASIO_HAS_STD_MUTEX_AND_CONDVAR)
+# if !defined(BOOST_ASIO_DISABLE_STD_MUTEX_AND_CONDVAR)
+# if defined(__clang__)
+# if defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# define BOOST_ASIO_HAS_STD_MUTEX_AND_CONDVAR 1
+# elif (__cplusplus >= 201103)
+# if __has_include(<mutex>)
+# define BOOST_ASIO_HAS_STD_MUTEX_AND_CONDVAR 1
+# endif // __has_include(<mutex>)
+# endif // (__cplusplus >= 201103)
+# endif // defined(__clang__)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_STD_MUTEX_AND_CONDVAR 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1700)
+# define BOOST_ASIO_HAS_STD_MUTEX_AND_CONDVAR 1
+# endif // (_MSC_VER >= 1700)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_STD_MUTEX_AND_CONDVAR)
+#endif // !defined(BOOST_ASIO_HAS_STD_MUTEX_AND_CONDVAR)
+
+// Standard library support for the call_once function.
+#if !defined(BOOST_ASIO_HAS_STD_CALL_ONCE)
+# if !defined(BOOST_ASIO_DISABLE_STD_CALL_ONCE)
+# if defined(__clang__)
+# if defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# define BOOST_ASIO_HAS_STD_CALL_ONCE 1
+# elif (__cplusplus >= 201103)
+# if __has_include(<mutex>)
+# define BOOST_ASIO_HAS_STD_CALL_ONCE 1
+# endif // __has_include(<mutex>)
+# endif // (__cplusplus >= 201103)
+# endif // defined(__clang__)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_STD_CALL_ONCE 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1700)
+# define BOOST_ASIO_HAS_STD_CALL_ONCE 1
+# endif // (_MSC_VER >= 1700)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_STD_CALL_ONCE)
+#endif // !defined(BOOST_ASIO_HAS_STD_CALL_ONCE)
+
+// Standard library support for futures.
+#if !defined(BOOST_ASIO_HAS_STD_FUTURE)
+# if !defined(BOOST_ASIO_DISABLE_STD_FUTURE)
+# if defined(__clang__)
+# if defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# define BOOST_ASIO_HAS_STD_FUTURE 1
+# elif (__cplusplus >= 201103)
+# if __has_include(<future>)
+# define BOOST_ASIO_HAS_STD_FUTURE 1
+# endif // __has_include(<mutex>)
+# endif // (__cplusplus >= 201103)
+# endif // defined(__clang__)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_STD_FUTURE 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1700)
+# define BOOST_ASIO_HAS_STD_FUTURE 1
+# endif // (_MSC_VER >= 1700)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_STD_FUTURE)
+#endif // !defined(BOOST_ASIO_HAS_STD_FUTURE)
+
+// Standard library support for std::string_view.
+#if !defined(BOOST_ASIO_HAS_STD_STRING_VIEW)
+# if !defined(BOOST_ASIO_DISABLE_STD_STRING_VIEW)
+# if defined(__clang__)
+# if defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# if (__cplusplus >= 201402)
+# if __has_include(<string_view>)
+# define BOOST_ASIO_HAS_STD_STRING_VIEW 1
+# endif // __has_include(<string_view>)
+# endif // (__cplusplus >= 201402)
+# else // defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# if (__cplusplus >= 201703)
+# if __has_include(<string_view>)
+# define BOOST_ASIO_HAS_STD_STRING_VIEW 1
+# endif // __has_include(<string_view>)
+# endif // (__cplusplus >= 201703)
+# endif // defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# elif defined(__GNUC__)
+# if (__GNUC__ >= 7)
+# if (__cplusplus >= 201703)
+# define BOOST_ASIO_HAS_STD_STRING_VIEW 1
+# endif // (__cplusplus >= 201703)
+# endif // (__GNUC__ >= 7)
+# elif defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1910 && _MSVC_LANG >= 201703)
+# define BOOST_ASIO_HAS_STD_STRING_VIEW 1
+# endif // (_MSC_VER >= 1910 && _MSVC_LANG >= 201703)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_STD_STRING_VIEW)
+#endif // !defined(BOOST_ASIO_HAS_STD_STRING_VIEW)
+
+// Standard library support for std::experimental::string_view.
+#if !defined(BOOST_ASIO_HAS_STD_EXPERIMENTAL_STRING_VIEW)
+# if !defined(BOOST_ASIO_DISABLE_STD_EXPERIMENTAL_STRING_VIEW)
+# if defined(__clang__)
+# if defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# if (_LIBCPP_VERSION < 7000)
+# if (__cplusplus >= 201402)
+# if __has_include(<experimental/string_view>)
+# define BOOST_ASIO_HAS_STD_EXPERIMENTAL_STRING_VIEW 1
+# endif // __has_include(<experimental/string_view>)
+# endif // (__cplusplus >= 201402)
+# endif // (_LIBCPP_VERSION < 7000)
+# else // defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# if (__cplusplus >= 201402)
+# if __has_include(<experimental/string_view>)
+# define BOOST_ASIO_HAS_STD_EXPERIMENTAL_STRING_VIEW 1
+# endif // __has_include(<experimental/string_view>)
+# endif // (__cplusplus >= 201402)
+# endif // // defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
+# endif // defined(__clang__)
+# if defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 9)) || (__GNUC__ > 4)
+# if (__cplusplus >= 201402)
+# define BOOST_ASIO_HAS_STD_EXPERIMENTAL_STRING_VIEW 1
+# endif // (__cplusplus >= 201402)
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 9)) || (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# endif // !defined(BOOST_ASIO_DISABLE_STD_EXPERIMENTAL_STRING_VIEW)
+#endif // !defined(BOOST_ASIO_HAS_STD_EXPERIMENTAL_STRING_VIEW)
+
+// Standard library has a string_view that we can use.
+#if !defined(BOOST_ASIO_HAS_STRING_VIEW)
+# if !defined(BOOST_ASIO_DISABLE_STRING_VIEW)
+# if defined(BOOST_ASIO_HAS_STD_STRING_VIEW)
+# define BOOST_ASIO_HAS_STRING_VIEW 1
+# elif defined(BOOST_ASIO_HAS_STD_EXPERIMENTAL_STRING_VIEW)
+# define BOOST_ASIO_HAS_STRING_VIEW 1
+# endif // defined(BOOST_ASIO_HAS_STD_EXPERIMENTAL_STRING_VIEW)
+# endif // !defined(BOOST_ASIO_DISABLE_STRING_VIEW)
+#endif // !defined(BOOST_ASIO_HAS_STRING_VIEW)
+
+// Standard library support for iostream move construction and assignment.
+#if !defined(BOOST_ASIO_HAS_STD_IOSTREAM_MOVE)
+# if !defined(BOOST_ASIO_DISABLE_STD_IOSTREAM_MOVE)
+# if defined(__GNUC__)
+# if (__GNUC__ > 4)
+# if defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_ASIO_HAS_STD_IOSTREAM_MOVE 1
+# endif // defined(__GXX_EXPERIMENTAL_CXX0X__)
+# endif // (__GNUC__ > 4)
+# endif // defined(__GNUC__)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1700)
+# define BOOST_ASIO_HAS_STD_IOSTREAM_MOVE 1
+# endif // (_MSC_VER >= 1700)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_STD_IOSTREAM_MOVE)
+#endif // !defined(BOOST_ASIO_HAS_STD_IOSTREAM_MOVE)
+
+// Standard library has invoke_result (which supersedes result_of).
+#if !defined(BOOST_ASIO_HAS_STD_INVOKE_RESULT)
+# if !defined(BOOST_ASIO_DISABLE_STD_INVOKE_RESULT)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_VER >= 1911 && _MSVC_LANG >= 201703)
+# define BOOST_ASIO_HAS_STD_INVOKE_RESULT 1
+# endif // (_MSC_VER >= 1911 && _MSVC_LANG >= 201703)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_STD_INVOKE_RESULT)
+#endif // !defined(BOOST_ASIO_HAS_STD_INVOKE_RESULT)
+
+// Windows App target. Windows but with a limited API.
+#if !defined(BOOST_ASIO_WINDOWS_APP)
+# if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0603)
+# include <winapifamily.h>
+# if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP) \
+ && !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+# define BOOST_ASIO_WINDOWS_APP 1
+# endif // WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP)
+ // && !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+# endif // defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0603)
+#endif // !defined(BOOST_ASIO_WINDOWS_APP)
+
+// Legacy WinRT target. Windows App is preferred.
+#if !defined(BOOST_ASIO_WINDOWS_RUNTIME)
+# if !defined(BOOST_ASIO_WINDOWS_APP)
+# if defined(__cplusplus_winrt)
+# include <winapifamily.h>
+# if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP) \
+ && !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+# define BOOST_ASIO_WINDOWS_RUNTIME 1
+# endif // WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP)
+ // && !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+# endif // defined(__cplusplus_winrt)
+# endif // !defined(BOOST_ASIO_WINDOWS_APP)
+#endif // !defined(BOOST_ASIO_WINDOWS_RUNTIME)
+
+// Windows target. Excludes WinRT but includes Windows App targets.
+#if !defined(BOOST_ASIO_WINDOWS)
+# if !defined(BOOST_ASIO_WINDOWS_RUNTIME)
+# if defined(BOOST_ASIO_HAS_BOOST_CONFIG) && defined(BOOST_WINDOWS)
+# define BOOST_ASIO_WINDOWS 1
+# elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__)
+# define BOOST_ASIO_WINDOWS 1
+# elif defined(BOOST_ASIO_WINDOWS_APP)
+# define BOOST_ASIO_WINDOWS 1
+# endif // defined(BOOST_ASIO_HAS_BOOST_CONFIG) && defined(BOOST_WINDOWS)
+# endif // !defined(BOOST_ASIO_WINDOWS_RUNTIME)
+#endif // !defined(BOOST_ASIO_WINDOWS)
+
+// Windows: target OS version.
+#if defined(BOOST_ASIO_WINDOWS) || defined(__CYGWIN__)
+# if !defined(_WIN32_WINNT) && !defined(_WIN32_WINDOWS)
+# if defined(_MSC_VER) || defined(__BORLANDC__)
+# pragma message( \
+ "Please define _WIN32_WINNT or _WIN32_WINDOWS appropriately. For example:\n"\
+ "- add -D_WIN32_WINNT=0x0501 to the compiler command line; or\n"\
+ "- add _WIN32_WINNT=0x0501 to your project's Preprocessor Definitions.\n"\
+ "Assuming _WIN32_WINNT=0x0501 (i.e. Windows XP target).")
+# else // defined(_MSC_VER) || defined(__BORLANDC__)
+# warning Please define _WIN32_WINNT or _WIN32_WINDOWS appropriately.
+# warning For example, add -D_WIN32_WINNT=0x0501 to the compiler command line.
+# warning Assuming _WIN32_WINNT=0x0501 (i.e. Windows XP target).
+# endif // defined(_MSC_VER) || defined(__BORLANDC__)
+# define _WIN32_WINNT 0x0501
+# endif // !defined(_WIN32_WINNT) && !defined(_WIN32_WINDOWS)
+# if defined(_MSC_VER)
+# if defined(_WIN32) && !defined(WIN32)
+# if !defined(_WINSOCK2API_)
+# define WIN32 // Needed for correct types in winsock2.h
+# else // !defined(_WINSOCK2API_)
+# error Please define the macro WIN32 in your compiler options
+# endif // !defined(_WINSOCK2API_)
+# endif // defined(_WIN32) && !defined(WIN32)
+# endif // defined(_MSC_VER)
+# if defined(__BORLANDC__)
+# if defined(__WIN32__) && !defined(WIN32)
+# if !defined(_WINSOCK2API_)
+# define WIN32 // Needed for correct types in winsock2.h
+# else // !defined(_WINSOCK2API_)
+# error Please define the macro WIN32 in your compiler options
+# endif // !defined(_WINSOCK2API_)
+# endif // defined(__WIN32__) && !defined(WIN32)
+# endif // defined(__BORLANDC__)
+# if defined(__CYGWIN__)
+# if !defined(__USE_W32_SOCKETS)
+# error You must add -D__USE_W32_SOCKETS to your compiler options.
+# endif // !defined(__USE_W32_SOCKETS)
+# endif // defined(__CYGWIN__)
+#endif // defined(BOOST_ASIO_WINDOWS) || defined(__CYGWIN__)
+
+// Windows: minimise header inclusion.
+#if defined(BOOST_ASIO_WINDOWS) || defined(__CYGWIN__)
+# if !defined(BOOST_ASIO_NO_WIN32_LEAN_AND_MEAN)
+# if !defined(WIN32_LEAN_AND_MEAN)
+# define WIN32_LEAN_AND_MEAN
+# endif // !defined(WIN32_LEAN_AND_MEAN)
+# endif // !defined(BOOST_ASIO_NO_WIN32_LEAN_AND_MEAN)
+#endif // defined(BOOST_ASIO_WINDOWS) || defined(__CYGWIN__)
+
+// Windows: suppress definition of "min" and "max" macros.
+#if defined(BOOST_ASIO_WINDOWS) || defined(__CYGWIN__)
+# if !defined(BOOST_ASIO_NO_NOMINMAX)
+# if !defined(NOMINMAX)
+# define NOMINMAX 1
+# endif // !defined(NOMINMAX)
+# endif // !defined(BOOST_ASIO_NO_NOMINMAX)
+#endif // defined(BOOST_ASIO_WINDOWS) || defined(__CYGWIN__)
+
+// Windows: IO Completion Ports.
+#if !defined(BOOST_ASIO_HAS_IOCP)
+# if defined(BOOST_ASIO_WINDOWS) || defined(__CYGWIN__)
+# if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0400)
+# if !defined(UNDER_CE) && !defined(BOOST_ASIO_WINDOWS_APP)
+# if !defined(BOOST_ASIO_DISABLE_IOCP)
+# define BOOST_ASIO_HAS_IOCP 1
+# endif // !defined(BOOST_ASIO_DISABLE_IOCP)
+# endif // !defined(UNDER_CE) && !defined(BOOST_ASIO_WINDOWS_APP)
+# endif // defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0400)
+# endif // defined(BOOST_ASIO_WINDOWS) || defined(__CYGWIN__)
+#endif // !defined(BOOST_ASIO_HAS_IOCP)
+
+// On POSIX (and POSIX-like) platforms we need to include unistd.h in order to
+// get access to the various platform feature macros, e.g. to be able to test
+// for threads support.
+#if !defined(BOOST_ASIO_HAS_UNISTD_H)
+# if !defined(BOOST_ASIO_HAS_BOOST_CONFIG)
+# if defined(unix) \
+ || defined(__unix) \
+ || defined(_XOPEN_SOURCE) \
+ || defined(_POSIX_SOURCE) \
+ || (defined(__MACH__) && defined(__APPLE__)) \
+ || defined(__FreeBSD__) \
+ || defined(__NetBSD__) \
+ || defined(__OpenBSD__) \
+ || defined(__linux__)
+# define BOOST_ASIO_HAS_UNISTD_H 1
+# endif
+# endif // !defined(BOOST_ASIO_HAS_BOOST_CONFIG)
+#endif // !defined(BOOST_ASIO_HAS_UNISTD_H)
+#if defined(BOOST_ASIO_HAS_UNISTD_H)
+# include <unistd.h>
+#endif // defined(BOOST_ASIO_HAS_UNISTD_H)
+
+// Linux: epoll, eventfd and timerfd.
+#if defined(__linux__)
+# include <linux/version.h>
+# if !defined(BOOST_ASIO_HAS_EPOLL)
+# if !defined(BOOST_ASIO_DISABLE_EPOLL)
+# if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,45)
+# define BOOST_ASIO_HAS_EPOLL 1
+# endif // LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,45)
+# endif // !defined(BOOST_ASIO_DISABLE_EPOLL)
+# endif // !defined(BOOST_ASIO_HAS_EPOLL)
+# if !defined(BOOST_ASIO_HAS_EVENTFD)
+# if !defined(BOOST_ASIO_DISABLE_EVENTFD)
+# if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
+# define BOOST_ASIO_HAS_EVENTFD 1
+# endif // LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
+# endif // !defined(BOOST_ASIO_DISABLE_EVENTFD)
+# endif // !defined(BOOST_ASIO_HAS_EVENTFD)
+# if !defined(BOOST_ASIO_HAS_TIMERFD)
+# if defined(BOOST_ASIO_HAS_EPOLL)
+# if (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 8)
+# define BOOST_ASIO_HAS_TIMERFD 1
+# endif // (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 8)
+# endif // defined(BOOST_ASIO_HAS_EPOLL)
+# endif // !defined(BOOST_ASIO_HAS_TIMERFD)
+#endif // defined(__linux__)
+
+// Mac OS X, FreeBSD, NetBSD, OpenBSD: kqueue.
+#if (defined(__MACH__) && defined(__APPLE__)) \
+ || defined(__FreeBSD__) \
+ || defined(__NetBSD__) \
+ || defined(__OpenBSD__)
+# if !defined(BOOST_ASIO_HAS_KQUEUE)
+# if !defined(BOOST_ASIO_DISABLE_KQUEUE)
+# define BOOST_ASIO_HAS_KQUEUE 1
+# endif // !defined(BOOST_ASIO_DISABLE_KQUEUE)
+# endif // !defined(BOOST_ASIO_HAS_KQUEUE)
+#endif // (defined(__MACH__) && defined(__APPLE__))
+ // || defined(__FreeBSD__)
+ // || defined(__NetBSD__)
+ // || defined(__OpenBSD__)
+
+// Solaris: /dev/poll.
+#if defined(__sun)
+# if !defined(BOOST_ASIO_HAS_DEV_POLL)
+# if !defined(BOOST_ASIO_DISABLE_DEV_POLL)
+# define BOOST_ASIO_HAS_DEV_POLL 1
+# endif // !defined(BOOST_ASIO_DISABLE_DEV_POLL)
+# endif // !defined(BOOST_ASIO_HAS_DEV_POLL)
+#endif // defined(__sun)
+
+// Serial ports.
+#if !defined(BOOST_ASIO_HAS_SERIAL_PORT)
+# if defined(BOOST_ASIO_HAS_IOCP) \
+ || !defined(BOOST_ASIO_WINDOWS) \
+ && !defined(BOOST_ASIO_WINDOWS_RUNTIME) \
+ && !defined(__CYGWIN__)
+# if !defined(__SYMBIAN32__)
+# if !defined(BOOST_ASIO_DISABLE_SERIAL_PORT)
+# define BOOST_ASIO_HAS_SERIAL_PORT 1
+# endif // !defined(BOOST_ASIO_DISABLE_SERIAL_PORT)
+# endif // !defined(__SYMBIAN32__)
+# endif // defined(BOOST_ASIO_HAS_IOCP)
+ // || !defined(BOOST_ASIO_WINDOWS)
+ // && !defined(BOOST_ASIO_WINDOWS_RUNTIME)
+ // && !defined(__CYGWIN__)
+#endif // !defined(BOOST_ASIO_HAS_SERIAL_PORT)
+
+// Windows: stream handles.
+#if !defined(BOOST_ASIO_HAS_WINDOWS_STREAM_HANDLE)
+# if !defined(BOOST_ASIO_DISABLE_WINDOWS_STREAM_HANDLE)
+# if defined(BOOST_ASIO_HAS_IOCP)
+# define BOOST_ASIO_HAS_WINDOWS_STREAM_HANDLE 1
+# endif // defined(BOOST_ASIO_HAS_IOCP)
+# endif // !defined(BOOST_ASIO_DISABLE_WINDOWS_STREAM_HANDLE)
+#endif // !defined(BOOST_ASIO_HAS_WINDOWS_STREAM_HANDLE)
+
+// Windows: random access handles.
+#if !defined(BOOST_ASIO_HAS_WINDOWS_RANDOM_ACCESS_HANDLE)
+# if !defined(BOOST_ASIO_DISABLE_WINDOWS_RANDOM_ACCESS_HANDLE)
+# if defined(BOOST_ASIO_HAS_IOCP)
+# define BOOST_ASIO_HAS_WINDOWS_RANDOM_ACCESS_HANDLE 1
+# endif // defined(BOOST_ASIO_HAS_IOCP)
+# endif // !defined(BOOST_ASIO_DISABLE_WINDOWS_RANDOM_ACCESS_HANDLE)
+#endif // !defined(BOOST_ASIO_HAS_WINDOWS_RANDOM_ACCESS_HANDLE)
+
+// Windows: object handles.
+#if !defined(BOOST_ASIO_HAS_WINDOWS_OBJECT_HANDLE)
+# if !defined(BOOST_ASIO_DISABLE_WINDOWS_OBJECT_HANDLE)
+# if defined(BOOST_ASIO_WINDOWS) || defined(__CYGWIN__)
+# if !defined(UNDER_CE) && !defined(BOOST_ASIO_WINDOWS_APP)
+# define BOOST_ASIO_HAS_WINDOWS_OBJECT_HANDLE 1
+# endif // !defined(UNDER_CE) && !defined(BOOST_ASIO_WINDOWS_APP)
+# endif // defined(BOOST_ASIO_WINDOWS) || defined(__CYGWIN__)
+# endif // !defined(BOOST_ASIO_DISABLE_WINDOWS_OBJECT_HANDLE)
+#endif // !defined(BOOST_ASIO_HAS_WINDOWS_OBJECT_HANDLE)
+
+// Windows: OVERLAPPED wrapper.
+#if !defined(BOOST_ASIO_HAS_WINDOWS_OVERLAPPED_PTR)
+# if !defined(BOOST_ASIO_DISABLE_WINDOWS_OVERLAPPED_PTR)
+# if defined(BOOST_ASIO_HAS_IOCP)
+# define BOOST_ASIO_HAS_WINDOWS_OVERLAPPED_PTR 1
+# endif // defined(BOOST_ASIO_HAS_IOCP)
+# endif // !defined(BOOST_ASIO_DISABLE_WINDOWS_OVERLAPPED_PTR)
+#endif // !defined(BOOST_ASIO_HAS_WINDOWS_OVERLAPPED_PTR)
+
+// POSIX: stream-oriented file descriptors.
+#if !defined(BOOST_ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
+# if !defined(BOOST_ASIO_DISABLE_POSIX_STREAM_DESCRIPTOR)
+# if !defined(BOOST_ASIO_WINDOWS) \
+ && !defined(BOOST_ASIO_WINDOWS_RUNTIME) \
+ && !defined(__CYGWIN__)
+# define BOOST_ASIO_HAS_POSIX_STREAM_DESCRIPTOR 1
+# endif // !defined(BOOST_ASIO_WINDOWS)
+ // && !defined(BOOST_ASIO_WINDOWS_RUNTIME)
+ // && !defined(__CYGWIN__)
+# endif // !defined(BOOST_ASIO_DISABLE_POSIX_STREAM_DESCRIPTOR)
+#endif // !defined(BOOST_ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
+
+// UNIX domain sockets.
+#if !defined(BOOST_ASIO_HAS_LOCAL_SOCKETS)
+# if !defined(BOOST_ASIO_DISABLE_LOCAL_SOCKETS)
+# if !defined(BOOST_ASIO_WINDOWS) \
+ && !defined(BOOST_ASIO_WINDOWS_RUNTIME) \
+ && !defined(__CYGWIN__)
+# define BOOST_ASIO_HAS_LOCAL_SOCKETS 1
+# endif // !defined(BOOST_ASIO_WINDOWS)
+ // && !defined(BOOST_ASIO_WINDOWS_RUNTIME)
+ // && !defined(__CYGWIN__)
+# endif // !defined(BOOST_ASIO_DISABLE_LOCAL_SOCKETS)
+#endif // !defined(BOOST_ASIO_HAS_LOCAL_SOCKETS)
+
+// Can use sigaction() instead of signal().
+#if !defined(BOOST_ASIO_HAS_SIGACTION)
+# if !defined(BOOST_ASIO_DISABLE_SIGACTION)
+# if !defined(BOOST_ASIO_WINDOWS) \
+ && !defined(BOOST_ASIO_WINDOWS_RUNTIME) \
+ && !defined(__CYGWIN__)
+# define BOOST_ASIO_HAS_SIGACTION 1
+# endif // !defined(BOOST_ASIO_WINDOWS)
+ // && !defined(BOOST_ASIO_WINDOWS_RUNTIME)
+ // && !defined(__CYGWIN__)
+# endif // !defined(BOOST_ASIO_DISABLE_SIGACTION)
+#endif // !defined(BOOST_ASIO_HAS_SIGACTION)
+
+// Can use signal().
+#if !defined(BOOST_ASIO_HAS_SIGNAL)
+# if !defined(BOOST_ASIO_DISABLE_SIGNAL)
+# if !defined(UNDER_CE)
+# define BOOST_ASIO_HAS_SIGNAL 1
+# endif // !defined(UNDER_CE)
+# endif // !defined(BOOST_ASIO_DISABLE_SIGNAL)
+#endif // !defined(BOOST_ASIO_HAS_SIGNAL)
+
+// Can use getaddrinfo() and getnameinfo().
+#if !defined(BOOST_ASIO_HAS_GETADDRINFO)
+# if !defined(BOOST_ASIO_DISABLE_GETADDRINFO)
+# if defined(BOOST_ASIO_WINDOWS) || defined(__CYGWIN__)
+# if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0501)
+# define BOOST_ASIO_HAS_GETADDRINFO 1
+# elif defined(UNDER_CE)
+# define BOOST_ASIO_HAS_GETADDRINFO 1
+# endif // defined(UNDER_CE)
+# elif defined(__MACH__) && defined(__APPLE__)
+# if defined(__MAC_OS_X_VERSION_MIN_REQUIRED)
+# if (__MAC_OS_X_VERSION_MIN_REQUIRED >= 1050)
+# define BOOST_ASIO_HAS_GETADDRINFO 1
+# endif // (__MAC_OS_X_VERSION_MIN_REQUIRED >= 1050)
+# else // defined(__MAC_OS_X_VERSION_MIN_REQUIRED)
+# define BOOST_ASIO_HAS_GETADDRINFO 1
+# endif // defined(__MAC_OS_X_VERSION_MIN_REQUIRED)
+# else // defined(__MACH__) && defined(__APPLE__)
+# define BOOST_ASIO_HAS_GETADDRINFO 1
+# endif // defined(__MACH__) && defined(__APPLE__)
+# endif // !defined(BOOST_ASIO_DISABLE_GETADDRINFO)
+#endif // !defined(BOOST_ASIO_HAS_GETADDRINFO)
+
+// Whether standard iostreams are disabled.
+#if !defined(BOOST_ASIO_NO_IOSTREAM)
+# if defined(BOOST_ASIO_HAS_BOOST_CONFIG) && defined(BOOST_NO_IOSTREAM)
+# define BOOST_ASIO_NO_IOSTREAM 1
+# endif // !defined(BOOST_NO_IOSTREAM)
+#endif // !defined(BOOST_ASIO_NO_IOSTREAM)
+
+// Whether exception handling is disabled.
+#if !defined(BOOST_ASIO_NO_EXCEPTIONS)
+# if defined(BOOST_ASIO_HAS_BOOST_CONFIG) && defined(BOOST_NO_EXCEPTIONS)
+# define BOOST_ASIO_NO_EXCEPTIONS 1
+# endif // !defined(BOOST_NO_EXCEPTIONS)
+#endif // !defined(BOOST_ASIO_NO_EXCEPTIONS)
+
+// Whether the typeid operator is supported.
+#if !defined(BOOST_ASIO_NO_TYPEID)
+# if defined(BOOST_ASIO_HAS_BOOST_CONFIG) && defined(BOOST_NO_TYPEID)
+# define BOOST_ASIO_NO_TYPEID 1
+# endif // !defined(BOOST_NO_TYPEID)
+#endif // !defined(BOOST_ASIO_NO_TYPEID)
+
+// Threads.
+#if !defined(BOOST_ASIO_HAS_THREADS)
+# if !defined(BOOST_ASIO_DISABLE_THREADS)
+# if defined(BOOST_ASIO_HAS_BOOST_CONFIG) && defined(BOOST_HAS_THREADS)
+# define BOOST_ASIO_HAS_THREADS 1
+# elif defined(__GNUC__) && !defined(__MINGW32__) \
+ && !defined(linux) && !defined(__linux) && !defined(__linux__)
+# define BOOST_ASIO_HAS_THREADS 1
+# elif defined(_MT) || defined(__MT__)
+# define BOOST_ASIO_HAS_THREADS 1
+# elif defined(_REENTRANT)
+# define BOOST_ASIO_HAS_THREADS 1
+# elif defined(__APPLE__)
+# define BOOST_ASIO_HAS_THREADS 1
+# elif defined(_POSIX_THREADS) && (_POSIX_THREADS + 0 >= 0)
+# define BOOST_ASIO_HAS_THREADS 1
+# elif defined(_PTHREADS)
+# define BOOST_ASIO_HAS_THREADS 1
+# endif // defined(BOOST_ASIO_HAS_BOOST_CONFIG) && defined(BOOST_HAS_THREADS)
+# endif // !defined(BOOST_ASIO_DISABLE_THREADS)
+#endif // !defined(BOOST_ASIO_HAS_THREADS)
+
+// POSIX threads.
+#if !defined(BOOST_ASIO_HAS_PTHREADS)
+# if defined(BOOST_ASIO_HAS_THREADS)
+# if defined(BOOST_ASIO_HAS_BOOST_CONFIG) && defined(BOOST_HAS_PTHREADS)
+# define BOOST_ASIO_HAS_PTHREADS 1
+# elif defined(_POSIX_THREADS) && (_POSIX_THREADS + 0 >= 0)
+# define BOOST_ASIO_HAS_PTHREADS 1
+# endif // defined(BOOST_ASIO_HAS_BOOST_CONFIG) && defined(BOOST_HAS_PTHREADS)
+# endif // defined(BOOST_ASIO_HAS_THREADS)
+#endif // !defined(BOOST_ASIO_HAS_PTHREADS)
+
+// Helper to prevent macro expansion.
+#define BOOST_ASIO_PREVENT_MACRO_SUBSTITUTION
+
+// Helper to define in-class constants.
+#if !defined(BOOST_ASIO_STATIC_CONSTANT)
+# if !defined(BOOST_ASIO_DISABLE_BOOST_STATIC_CONSTANT)
+# define BOOST_ASIO_STATIC_CONSTANT(type, assignment) \
+ BOOST_STATIC_CONSTANT(type, assignment)
+# else // !defined(BOOST_ASIO_DISABLE_BOOST_STATIC_CONSTANT)
+# define BOOST_ASIO_STATIC_CONSTANT(type, assignment) \
+ static const type assignment
+# endif // !defined(BOOST_ASIO_DISABLE_BOOST_STATIC_CONSTANT)
+#endif // !defined(BOOST_ASIO_STATIC_CONSTANT)
+
+// Boost array library.
+#if !defined(BOOST_ASIO_HAS_BOOST_ARRAY)
+# if !defined(BOOST_ASIO_DISABLE_BOOST_ARRAY)
+# define BOOST_ASIO_HAS_BOOST_ARRAY 1
+# endif // !defined(BOOST_ASIO_DISABLE_BOOST_ARRAY)
+#endif // !defined(BOOST_ASIO_HAS_BOOST_ARRAY)
+
+// Boost assert macro.
+#if !defined(BOOST_ASIO_HAS_BOOST_ASSERT)
+# if !defined(BOOST_ASIO_DISABLE_BOOST_ASSERT)
+# define BOOST_ASIO_HAS_BOOST_ASSERT 1
+# endif // !defined(BOOST_ASIO_DISABLE_BOOST_ASSERT)
+#endif // !defined(BOOST_ASIO_HAS_BOOST_ASSERT)
+
+// Boost limits header.
+#if !defined(BOOST_ASIO_HAS_BOOST_LIMITS)
+# if !defined(BOOST_ASIO_DISABLE_BOOST_LIMITS)
+# define BOOST_ASIO_HAS_BOOST_LIMITS 1
+# endif // !defined(BOOST_ASIO_DISABLE_BOOST_LIMITS)
+#endif // !defined(BOOST_ASIO_HAS_BOOST_LIMITS)
+
+// Boost throw_exception function.
+#if !defined(BOOST_ASIO_HAS_BOOST_THROW_EXCEPTION)
+# if !defined(BOOST_ASIO_DISABLE_BOOST_THROW_EXCEPTION)
+# define BOOST_ASIO_HAS_BOOST_THROW_EXCEPTION 1
+# endif // !defined(BOOST_ASIO_DISABLE_BOOST_THROW_EXCEPTION)
+#endif // !defined(BOOST_ASIO_HAS_BOOST_THROW_EXCEPTION)
+
+// Boost regex library.
+#if !defined(BOOST_ASIO_HAS_BOOST_REGEX)
+# if !defined(BOOST_ASIO_DISABLE_BOOST_REGEX)
+# define BOOST_ASIO_HAS_BOOST_REGEX 1
+# endif // !defined(BOOST_ASIO_DISABLE_BOOST_REGEX)
+#endif // !defined(BOOST_ASIO_HAS_BOOST_REGEX)
+
+// Boost bind function.
+#if !defined(BOOST_ASIO_HAS_BOOST_BIND)
+# if !defined(BOOST_ASIO_DISABLE_BOOST_BIND)
+# define BOOST_ASIO_HAS_BOOST_BIND 1
+# endif // !defined(BOOST_ASIO_DISABLE_BOOST_BIND)
+#endif // !defined(BOOST_ASIO_HAS_BOOST_BIND)
+
+// Boost's BOOST_WORKAROUND macro.
+#if !defined(BOOST_ASIO_HAS_BOOST_WORKAROUND)
+# if !defined(BOOST_ASIO_DISABLE_BOOST_WORKAROUND)
+# define BOOST_ASIO_HAS_BOOST_WORKAROUND 1
+# endif // !defined(BOOST_ASIO_DISABLE_BOOST_WORKAROUND)
+#endif // !defined(BOOST_ASIO_HAS_BOOST_WORKAROUND)
+
+// Microsoft Visual C++'s secure C runtime library.
+#if !defined(BOOST_ASIO_HAS_SECURE_RTL)
+# if !defined(BOOST_ASIO_DISABLE_SECURE_RTL)
+# if defined(BOOST_ASIO_MSVC) \
+ && (BOOST_ASIO_MSVC >= 1400) \
+ && !defined(UNDER_CE)
+# define BOOST_ASIO_HAS_SECURE_RTL 1
+# endif // defined(BOOST_ASIO_MSVC)
+ // && (BOOST_ASIO_MSVC >= 1400)
+ // && !defined(UNDER_CE)
+# endif // !defined(BOOST_ASIO_DISABLE_SECURE_RTL)
+#endif // !defined(BOOST_ASIO_HAS_SECURE_RTL)
+
+// Handler hooking. Disabled for ancient Borland C++ and gcc compilers.
+#if !defined(BOOST_ASIO_HAS_HANDLER_HOOKS)
+# if !defined(BOOST_ASIO_DISABLE_HANDLER_HOOKS)
+# if defined(__GNUC__)
+# if (__GNUC__ >= 3)
+# define BOOST_ASIO_HAS_HANDLER_HOOKS 1
+# endif // (__GNUC__ >= 3)
+# elif !defined(__BORLANDC__)
+# define BOOST_ASIO_HAS_HANDLER_HOOKS 1
+# endif // !defined(__BORLANDC__)
+# endif // !defined(BOOST_ASIO_DISABLE_HANDLER_HOOKS)
+#endif // !defined(BOOST_ASIO_HAS_HANDLER_HOOKS)
+
+// Support for the __thread keyword extension.
+#if !defined(BOOST_ASIO_DISABLE_THREAD_KEYWORD_EXTENSION)
+# if defined(__linux__)
+# if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
+# if ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 3)) || (__GNUC__ > 3)
+# if !defined(__INTEL_COMPILER) && !defined(__ICL) \
+ && !(defined(__clang__) && defined(__ANDROID__))
+# define BOOST_ASIO_HAS_THREAD_KEYWORD_EXTENSION 1
+# define BOOST_ASIO_THREAD_KEYWORD __thread
+# elif defined(__INTEL_COMPILER) && (__INTEL_COMPILER >= 1100)
+# define BOOST_ASIO_HAS_THREAD_KEYWORD_EXTENSION 1
+# endif // defined(__INTEL_COMPILER) && (__INTEL_COMPILER >= 1100)
+ // && !(defined(__clang__) && defined(__ANDROID__))
+# endif // ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 3)) || (__GNUC__ > 3)
+# endif // defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
+# endif // defined(__linux__)
+# if defined(BOOST_ASIO_MSVC) && defined(BOOST_ASIO_WINDOWS_RUNTIME)
+# if (_MSC_VER >= 1700)
+# define BOOST_ASIO_HAS_THREAD_KEYWORD_EXTENSION 1
+# define BOOST_ASIO_THREAD_KEYWORD __declspec(thread)
+# endif // (_MSC_VER >= 1700)
+# endif // defined(BOOST_ASIO_MSVC) && defined(BOOST_ASIO_WINDOWS_RUNTIME)
+#endif // !defined(BOOST_ASIO_DISABLE_THREAD_KEYWORD_EXTENSION)
+#if !defined(BOOST_ASIO_THREAD_KEYWORD)
+# define BOOST_ASIO_THREAD_KEYWORD __thread
+#endif // !defined(BOOST_ASIO_THREAD_KEYWORD)
+
+// Support for POSIX ssize_t typedef.
+#if !defined(BOOST_ASIO_DISABLE_SSIZE_T)
+# if defined(__linux__) \
+ || (defined(__MACH__) && defined(__APPLE__))
+# define BOOST_ASIO_HAS_SSIZE_T 1
+# endif // defined(__linux__)
+ // || (defined(__MACH__) && defined(__APPLE__))
+#endif // !defined(BOOST_ASIO_DISABLE_SSIZE_T)
+
+// Helper macros to manage the transition away from the old services-based API.
+#if defined(BOOST_ASIO_ENABLE_OLD_SERVICES)
+# define BOOST_ASIO_SVC_TPARAM , typename Service
+# define BOOST_ASIO_SVC_TPARAM_DEF1(d1) , typename Service d1
+# define BOOST_ASIO_SVC_TPARAM_DEF2(d1, d2) , typename Service d1, d2
+# define BOOST_ASIO_SVC_TARG , Service
+# define BOOST_ASIO_SVC_T Service
+# define BOOST_ASIO_SVC_TPARAM1 , typename Service1
+# define BOOST_ASIO_SVC_TPARAM1_DEF1(d1) , typename Service1 d1
+# define BOOST_ASIO_SVC_TPARAM1_DEF2(d1, d2) , typename Service1 d1, d2
+# define BOOST_ASIO_SVC_TARG1 , Service1
+# define BOOST_ASIO_SVC_T1 Service1
+# define BOOST_ASIO_SVC_ACCESS public
+#else // defined(BOOST_ASIO_ENABLE_OLD_SERVICES)
+# define BOOST_ASIO_SVC_TPARAM
+# define BOOST_ASIO_SVC_TPARAM_DEF1(d1)
+# define BOOST_ASIO_SVC_TPARAM_DEF2(d1, d2)
+# define BOOST_ASIO_SVC_TARG
+// BOOST_ASIO_SVC_T is defined at each point of use.
+# define BOOST_ASIO_SVC_TPARAM1
+# define BOOST_ASIO_SVC_TPARAM1_DEF1(d1)
+# define BOOST_ASIO_SVC_TPARAM1_DEF2(d1, d2)
+# define BOOST_ASIO_SVC_TARG1
+// BOOST_ASIO_SVC_T1 is defined at each point of use.
+# define BOOST_ASIO_SVC_ACCESS protected
+#endif // defined(BOOST_ASIO_ENABLE_OLD_SERVICES)
+
+// Helper macros to manage transition away from error_code return values.
+#if defined(BOOST_ASIO_NO_DEPRECATED)
+# define BOOST_ASIO_SYNC_OP_VOID void
+# define BOOST_ASIO_SYNC_OP_VOID_RETURN(e) return
+#else // defined(BOOST_ASIO_NO_DEPRECATED)
+# define BOOST_ASIO_SYNC_OP_VOID boost::system::error_code
+# define BOOST_ASIO_SYNC_OP_VOID_RETURN(e) return e
+#endif // defined(BOOST_ASIO_NO_DEPRECATED)
+
+// Newer gcc, clang need special treatment to suppress unused typedef warnings.
+#if defined(__clang__)
+# if defined(__apple_build_version__)
+# if (__clang_major__ >= 7)
+# define BOOST_ASIO_UNUSED_TYPEDEF __attribute__((__unused__))
+# endif // (__clang_major__ >= 7)
+# elif ((__clang_major__ == 3) && (__clang_minor__ >= 6)) \
+ || (__clang_major__ > 3)
+# define BOOST_ASIO_UNUSED_TYPEDEF __attribute__((__unused__))
+# endif // ((__clang_major__ == 3) && (__clang_minor__ >= 6))
+ // || (__clang_major__ > 3)
+#elif defined(__GNUC__)
+# if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 8)) || (__GNUC__ > 4)
+# define BOOST_ASIO_UNUSED_TYPEDEF __attribute__((__unused__))
+# endif // ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 8)) || (__GNUC__ > 4)
+#endif // defined(__GNUC__)
+#if !defined(BOOST_ASIO_UNUSED_TYPEDEF)
+# define BOOST_ASIO_UNUSED_TYPEDEF
+#endif // !defined(BOOST_ASIO_UNUSED_TYPEDEF)
+
+// Some versions of gcc generate spurious warnings about unused variables.
+#if defined(__GNUC__)
+# if (__GNUC__ >= 4)
+# define BOOST_ASIO_UNUSED_VARIABLE __attribute__((__unused__))
+# endif // (__GNUC__ >= 4)
+#endif // defined(__GNUC__)
+#if !defined(BOOST_ASIO_UNUSED_VARIABLE)
+# define BOOST_ASIO_UNUSED_VARIABLE
+#endif // !defined(BOOST_ASIO_UNUSED_VARIABLE)
+
+// Support co_await on compilers known to allow it.
+#if !defined(BOOST_ASIO_HAS_CO_AWAIT)
+# if !defined(BOOST_ASIO_DISABLE_CO_AWAIT)
+# if defined(BOOST_ASIO_MSVC)
+# if (_MSC_FULL_VER >= 190023506)
+# if defined(_RESUMABLE_FUNCTIONS_SUPPORTED)
+# define BOOST_ASIO_HAS_CO_AWAIT 1
+# endif // defined(_RESUMABLE_FUNCTIONS_SUPPORTED)
+# endif // (_MSC_FULL_VER >= 190023506)
+# endif // defined(BOOST_ASIO_MSVC)
+# endif // !defined(BOOST_ASIO_DISABLE_CO_AWAIT)
+# if defined(__clang__)
+# if (__cpp_coroutines >= 201703)
+# if __has_include(<experimental/coroutine>)
+# define BOOST_ASIO_HAS_CO_AWAIT 1
+# endif // __has_include(<experimental/coroutine>)
+# endif // (__cpp_coroutines >= 201703)
+# endif // defined(__clang__)
+#endif // !defined(BOOST_ASIO_HAS_CO_AWAIT)
+
+#endif // BOOST_ASIO_DETAIL_CONFIG_HPP