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Diffstat (limited to 'src/third_party/boost-1.69.0/boost/type_traits/is_copy_constructible.hpp')
| -rw-r--r-- | src/third_party/boost-1.69.0/boost/type_traits/is_copy_constructible.hpp | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/src/third_party/boost-1.69.0/boost/type_traits/is_copy_constructible.hpp b/src/third_party/boost-1.69.0/boost/type_traits/is_copy_constructible.hpp new file mode 100644 index 00000000000..ef97e18eb56 --- /dev/null +++ b/src/third_party/boost-1.69.0/boost/type_traits/is_copy_constructible.hpp @@ -0,0 +1,185 @@ +// (C) Copyright Antony Polukhin 2013. +// +// Use, modification and distribution are subject to 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). +// +// See http://www.boost.org/libs/type_traits for most recent version including documentation. + +#ifndef BOOST_TT_IS_COPY_CONSTRUCTIBLE_HPP_INCLUDED +#define BOOST_TT_IS_COPY_CONSTRUCTIBLE_HPP_INCLUDED + +#include <boost/config.hpp> +#include <boost/detail/workaround.hpp> + +#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_DECLTYPE) && !BOOST_WORKAROUND(BOOST_MSVC, < 1800) && !BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40900) + +#include <boost/type_traits/is_constructible.hpp> + +#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1800) + +namespace boost { + +template <class T> struct is_copy_constructible : public boost::is_constructible<T, const T&>{}; + +template <> struct is_copy_constructible<void> : public false_type{}; +template <> struct is_copy_constructible<void const> : public false_type{}; +template <> struct is_copy_constructible<void const volatile> : public false_type{}; +template <> struct is_copy_constructible<void volatile> : public false_type{}; + +} // namespace boost + +#else +// +// Special version for VC12 which has a problem when a base class (such as non_copyable) has a deleted +// copy constructor. In this case the compiler thinks there really is a copy-constructor and tries to +// instantiate the deleted member. std::is_copy_constructible has the same issue (or at least returns +// an incorrect value, which just defers the issue into the users code) as well. We can at least fix +// boost::non_copyable as a base class as a special case: +// +#include <boost/type_traits/is_noncopyable.hpp> + +namespace boost { + + namespace detail + { + + template <class T, bool b> struct is_copy_constructible_imp : public boost::is_constructible<T, const T&>{}; + template <class T> struct is_copy_constructible_imp<T, true> : public false_type{}; + + } + + template <class T> struct is_copy_constructible : public detail::is_copy_constructible_imp<T, is_noncopyable<T>::value>{}; + + template <> struct is_copy_constructible<void> : public false_type{}; + template <> struct is_copy_constructible<void const> : public false_type{}; + template <> struct is_copy_constructible<void const volatile> : public false_type{}; + template <> struct is_copy_constructible<void volatile> : public false_type{}; + +} // namespace boost + +#endif + +#else + +#include <boost/type_traits/detail/yes_no_type.hpp> +#include <boost/type_traits/is_noncopyable.hpp> +#include <boost/type_traits/add_reference.hpp> +#include <boost/type_traits/is_rvalue_reference.hpp> +#include <boost/type_traits/declval.hpp> +#include <boost/type_traits/is_array.hpp> +#include <boost/type_traits/declval.hpp> + +#ifdef BOOST_MSVC +#pragma warning(push) +#pragma warning(disable:4181) +#endif + +namespace boost { + + namespace detail{ + + template <bool DerivedFromNoncopyable, class T> + struct is_copy_constructible_impl2 { + + // Intel compiler has problems with SFINAE for copy constructors and deleted functions: + // + // error: function *function_name* cannot be referenced -- it is a deleted function + // static boost::type_traits::yes_type test(T1&, decltype(T1(boost::declval<T1&>()))* = 0); + // ^ + // + // MSVC 12.0 (Visual 2013) has problems when the copy constructor has been deleted. See: + // https://connect.microsoft.com/VisualStudio/feedback/details/800328/std-is-copy-constructible-is-broken +#if !defined(BOOST_NO_CXX11_DELETED_FUNCTIONS) && !defined(BOOST_INTEL_CXX_VERSION) && !(defined(BOOST_MSVC) && _MSC_VER == 1800) + +#ifdef BOOST_NO_CXX11_DECLTYPE + template <class T1> + static boost::type_traits::yes_type test(const T1&, boost::mpl::int_<sizeof(T1(boost::declval<const T1&>()))>* = 0); +#else + template <class T1> + static boost::type_traits::yes_type test(const T1&, decltype(T1(boost::declval<const T1&>()))* = 0); +#endif + + static boost::type_traits::no_type test(...); +#else + template <class T1> + static boost::type_traits::no_type test(const T1&, typename T1::boost_move_no_copy_constructor_or_assign* = 0); + static boost::type_traits::yes_type test(...); +#endif + + // If you see errors like this: + // + // `'T::T(const T&)' is private` + // `boost/type_traits/is_copy_constructible.hpp:68:5: error: within this context` + // + // then you are trying to call that macro for a structure defined like that: + // + // struct T { + // ... + // private: + // T(const T &); + // ... + // }; + // + // To fix that you must modify your structure: + // + // // C++03 and C++11 version + // struct T: private boost::noncopyable { + // ... + // private: + // T(const T &); + // ... + // }; + // + // // C++11 version + // struct T { + // ... + // private: + // T(const T &) = delete; + // ... + // }; + BOOST_STATIC_CONSTANT(bool, value = ( + sizeof(test( + boost::declval<BOOST_DEDUCED_TYPENAME boost::add_reference<T const>::type>() + )) == sizeof(boost::type_traits::yes_type) + && + !boost::is_rvalue_reference<T>::value + && !boost::is_array<T>::value + )); + }; + + template <class T> + struct is_copy_constructible_impl2<true, T> { + BOOST_STATIC_CONSTANT(bool, value = false); + }; + + template <class T> + struct is_copy_constructible_impl { + + BOOST_STATIC_CONSTANT(bool, value = ( + boost::detail::is_copy_constructible_impl2< + boost::is_noncopyable<T>::value, + T + >::value + )); + }; + + } // namespace detail + + template <class T> struct is_copy_constructible : public integral_constant<bool, ::boost::detail::is_copy_constructible_impl<T>::value>{}; + template <> struct is_copy_constructible<void> : public false_type{}; +#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS + template <> struct is_copy_constructible<void const> : public false_type{}; + template <> struct is_copy_constructible<void volatile> : public false_type{}; + template <> struct is_copy_constructible<void const volatile> : public false_type{}; +#endif + +} // namespace boost + +#ifdef BOOST_MSVC +#pragma warning(pop) +#endif + +#endif + +#endif // BOOST_TT_IS_COPY_CONSTRUCTIBLE_HPP_INCLUDED |