1 files changed, 152 insertions, 0 deletions
diff --git a/src/third_party/boost-1.69.0/boost/type_traits/common_type.hpp b/src/third_party/boost-1.69.0/boost/type_traits/common_type.hpp
new file mode 100644
index 00000000000..7136d3eed26
--- /dev/null
+++ b/src/third_party/boost-1.69.0/boost/type_traits/common_type.hpp
@@ -0,0 +1,152 @@
+#ifndef BOOST_TYPE_TRAITS_COMMON_TYPE_HPP_INCLUDED
+#define BOOST_TYPE_TRAITS_COMMON_TYPE_HPP_INCLUDED
+
+//
+//  Copyright 2015 Peter Dimov
+//
+//  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
+//
+
+#include <boost/config.hpp>
+#include <boost/type_traits/decay.hpp>
+#include <boost/type_traits/declval.hpp>
+#include <boost/detail/workaround.hpp>
+#include <boost/type_traits/is_complete.hpp>
+#include <boost/type_traits/is_void.hpp>
+#include <boost/type_traits/is_array.hpp>
+#include <boost/static_assert.hpp>
+
+#if defined(BOOST_NO_CXX11_DECLTYPE)
+#include <boost/type_traits/detail/common_type_impl.hpp>
+#endif
+
+#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES) && !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+#include <boost/type_traits/detail/mp_defer.hpp>
+#endif
+
+namespace boost
+{
+
+// variadic common_type
+
+#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+
+template<class... T> struct common_type
+{
+};
+
+#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
+
+template<class... T> using common_type_t = typename common_type<T...>::type;
+
+namespace type_traits_detail
+{
+
+template<class T1, class T2, class... T> using common_type_fold = common_type_t<common_type_t<T1, T2>, T...>;
+
+} // namespace type_traits_detail
+
+template<class T1, class T2, class... T>
+struct common_type<T1, T2, T...>: type_traits_detail::mp_defer<type_traits_detail::common_type_fold, T1, T2, T...>
+{
+};
+
+#else
+
+template<class T1, class T2, class... T>
+struct common_type<T1, T2, T...>: common_type<typename common_type<T1, T2>::type, T...>
+{
+};
+
+#endif // !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
+
+#else
+
+template<
+    class T1 = void, class T2 = void, class T3 = void,
+    class T4 = void, class T5 = void, class T6 = void,
+    class T7 = void, class T8 = void, class T9 = void
+>
+struct common_type: common_type<typename common_type<T1, T2>::type, T3, T4, T5, T6, T7, T8, T9>
+{
+};
+
+#endif // !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+
+// one argument
+
+template<class T> struct common_type<T>: boost::decay<T>
+{
+   BOOST_STATIC_ASSERT_MSG(::boost::is_complete<T>::value || ::boost::is_void<T>::value || ::boost::is_array<T>::value, "Arguments to common_type must both be complete types");
+};
+
+// two arguments
+
+namespace type_traits_detail
+{
+
+// binary common_type
+
+#if !defined(BOOST_NO_CXX11_DECLTYPE)
+
+#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES) && !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+    
+#if !defined(BOOST_MSVC) || BOOST_MSVC > 1800
+
+// internal compiler error on msvc-12.0
+
+template<class T1, class T2> using builtin_common_type = typename boost::decay<decltype( boost::declval<bool>()? boost::declval<T1>(): boost::declval<T2>() )>::type;
+
+template<class T1, class T2> struct common_type_impl: mp_defer<builtin_common_type, T1, T2>
+{
+};
+
+#else
+
+template<class T1, class T2> using builtin_common_type = decltype( boost::declval<bool>()? boost::declval<T1>(): boost::declval<T2>() );
+
+template<class T1, class T2> struct common_type_impl_2: mp_defer<builtin_common_type, T1, T2>
+{
+};
+
+template<class T1, class T2> using decay_common_type = typename boost::decay<typename common_type_impl_2<T1, T2>::type>::type;
+
+template<class T1, class T2> struct common_type_impl: mp_defer<decay_common_type, T1, T2>
+{
+};
+
+#endif // !defined(BOOST_MSVC) || BOOST_MSVC > 1800
+
+#else
+
+template<class T1, class T2> struct common_type_impl: boost::decay<decltype( boost::declval<bool>()? boost::declval<T1>(): boost::declval<T2>() )>
+{
+};
+
+#endif // #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES) && !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+
+#endif // #if !defined(BOOST_NO_CXX11_DECLTYPE)
+
+// decay helper
+
+template<class T1, class T2, class T1d = typename boost::decay<T1>::type, class T2d = typename boost::decay<T2>::type> struct common_type_decay_helper: boost::common_type<T1d, T2d>
+{
+};
+
+template<class T1, class T2> struct common_type_decay_helper<T1, T2, T1, T2>: common_type_impl<T1, T2>
+{
+};
+
+} // type_traits_detail
+
+template<class T1, class T2> struct common_type<T1, T2>: type_traits_detail::common_type_decay_helper<T1, T2>
+{
+   BOOST_STATIC_ASSERT_MSG(::boost::is_complete<T1>::value || ::boost::is_void<T1>::value || ::boost::is_array<T1>::value, "Arguments to common_type must both be complete types");
+   BOOST_STATIC_ASSERT_MSG(::boost::is_complete<T2>::value || ::boost::is_void<T2>::value || ::boost::is_array<T2>::value, "Arguments to common_type must both be complete types");
+};
+
+} // namespace boost
+
+#endif // #ifndef BOOST_TYPE_TRAITS_COMMON_TYPE_HPP_INCLUDED