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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_ASSIGN_HPP_INCLUDED |
10 | #define BOOST_TT_HAS_TRIVIAL_ASSIGN_HPP_INCLUDED |
11 | |
12 | #include <cstddef> // size_t |
13 | #include <boost/type_traits/detail/config.hpp> |
14 | #include <boost/type_traits/intrinsics.hpp> |
15 | #include <boost/type_traits/integral_constant.hpp> |
16 | |
17 | #if !defined(BOOST_HAS_TRIVIAL_ASSIGN) || defined(BOOST_MSVC) || defined(__GNUC__) || defined(BOOST_INTEL) || defined(__SUNPRO_CC) || defined(__clang__) |
18 | #include <boost/type_traits/is_pod.hpp> |
19 | #include <boost/type_traits/is_const.hpp> |
20 | #include <boost/type_traits/is_volatile.hpp> |
21 | #include <boost/type_traits/is_assignable.hpp> |
22 | #endif |
23 | |
24 | namespace boost { |
25 | |
26 | template <typename T> |
27 | struct has_trivial_assign : public integral_constant < bool, |
28 | #ifdef BOOST_HAS_TRIVIAL_ASSIGN |
29 | BOOST_HAS_TRIVIAL_ASSIGN(T) |
30 | #else |
31 | ::boost::is_pod<T>::value && !::boost::is_const<T>::value && !::boost::is_volatile<T>::value |
32 | #endif |
33 | > {}; |
34 | |
35 | template<> struct has_trivial_assign<void> : public false_type{}; |
36 | #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS |
37 | template<> struct has_trivial_assign<void const> : public false_type{}; |
38 | template<> struct has_trivial_assign<void const volatile> : public false_type{}; |
39 | template<> struct has_trivial_assign<void volatile> : public false_type{}; |
40 | #endif |
41 | template <class T> struct has_trivial_assign<T volatile> : public false_type{}; |
42 | template <class T> struct has_trivial_assign<T&> : public false_type{}; |
43 | #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) |
44 | template <class T> struct has_trivial_assign<T&&> : public false_type{}; |
45 | #endif |
46 | // Arrays are not explictly assignable: |
47 | template <typename T, std::size_t N> struct has_trivial_assign<T[N]> : public false_type{}; |
48 | template <typename T> struct has_trivial_assign<T[]> : public false_type{}; |
49 | |
50 | } // namespace boost |
51 | |
52 | #endif // BOOST_TT_HAS_TRIVIAL_ASSIGN_HPP_INCLUDED |
53 |