1 2 // (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000. 3 // Use, modification and distribution are subject to the Boost Software License, 4 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at 5 // http://www.boost.org/LICENSE_1_0.txt). 6 // 7 // See http://www.boost.org/libs/type_traits for most recent version including documentation. 8 9 #ifndef BOOST_TT_HAS_TRIVIAL_COPY_HPP_INCLUDED 10 #define BOOST_TT_HAS_TRIVIAL_COPY_HPP_INCLUDED 11 12 #include <cstddef> // size_t 13 #include <boost/type_traits/intrinsics.hpp> 14 #include <boost/type_traits/is_pod.hpp> 15 #include <boost/type_traits/is_reference.hpp> 16 17 #if (defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 409)) || defined(BOOST_CLANG) || (defined(__SUNPRO_CC) && defined(BOOST_HAS_TRIVIAL_COPY)) 18 #include <boost/type_traits/is_copy_constructible.hpp> 19 #define BOOST_TT_TRIVIAL_CONSTRUCT_FIX && is_copy_constructible<T>::value 20 #else 21 #define BOOST_TT_TRIVIAL_CONSTRUCT_FIX 22 #endif 23 24 #ifdef BOOST_INTEL 25 #include <boost/type_traits/add_const.hpp> 26 #include <boost/type_traits/add_lvalue_reference.hpp> 27 #endif 28 29 namespace boost { 30 31 template <typename T> struct has_trivial_copy 32 : public integral_constant<bool, 33 #ifdef BOOST_HAS_TRIVIAL_COPY 34 BOOST_HAS_TRIVIAL_COPY(T) BOOST_TT_TRIVIAL_CONSTRUCT_FIX 35 #else 36 ::boost::is_pod<T>::value 37 #endif 38 >{}; 39 // Arrays are not explicitly copyable: 40 template <typename T, std::size_t N> struct has_trivial_copy<T[N]> : public false_type{}; 41 template <typename T> struct has_trivial_copy<T[]> : public false_type{}; 42 // Are volatile types ever trivial? We don't really know, so assume not: 43 template <typename T> struct has_trivial_copy<T volatile> : public false_type{}; 44 45 template <> struct has_trivial_copy<void> : public false_type{}; 46 #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS 47 template <> struct has_trivial_copy<void const> : public false_type{}; 48 template <> struct has_trivial_copy<void volatile> : public false_type{}; 49 template <> struct has_trivial_copy<void const volatile> : public false_type{}; 50 #endif 51 52 template <class T> struct has_trivial_copy<T&> : public false_type{}; 53 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) 54 template <class T> struct has_trivial_copy<T&&> : public false_type{}; 55 #endif 56 57 template <class T> struct has_trivial_copy_constructor : public has_trivial_copy<T>{}; 58 59 #undef BOOST_TT_TRIVIAL_CONSTRUCT_FIX 60 61 } // namespace boost 62 63 #endif // BOOST_TT_HAS_TRIVIAL_COPY_HPP_INCLUDED 64