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_NOTHROW_CONSTRUCTOR_HPP_INCLUDED
10#define BOOST_TT_HAS_NOTHROW_CONSTRUCTOR_HPP_INCLUDED
11
12#include <cstddef> // size_t
13#include <boost/type_traits/intrinsics.hpp>
14#include <boost/type_traits/integral_constant.hpp>
15
16#ifdef BOOST_HAS_NOTHROW_CONSTRUCTOR
17
18#if defined(BOOST_MSVC) || defined(BOOST_INTEL)
19#include <boost/type_traits/has_trivial_constructor.hpp>
20#endif
21#if defined(__GNUC__ ) || defined(__SUNPRO_CC) || defined(__clang__)
22#include <boost/type_traits/is_default_constructible.hpp>
23#endif
24
25namespace boost {
26
27template <class T> struct has_nothrow_constructor : public integral_constant<bool, BOOST_HAS_NOTHROW_CONSTRUCTOR(T)>{};
28
29#elif !defined(BOOST_NO_CXX11_NOEXCEPT)
30
31#include <boost/type_traits/is_default_constructible.hpp>
32#include <boost/type_traits/remove_all_extents.hpp>
33
34#ifdef BOOST_MSVC
35#pragma warning(push)
36#pragma warning(disable:4197) // top-level volatile in cast is ignored
37#endif
38
39namespace boost { namespace detail{
40
41 template <class T, bool b> struct has_nothrow_constructor_imp : public boost::integral_constant<bool, false>{};
42 template <class T> struct has_nothrow_constructor_imp<T, true> : public boost::integral_constant<bool, noexcept(T())>{};
43 template <class T, std::size_t N> struct has_nothrow_constructor_imp<T[N], true> : public has_nothrow_constructor_imp<T, true> {};
44}
45
46template <class T> struct has_nothrow_constructor : public detail::has_nothrow_constructor_imp<T, is_default_constructible<T>::value>{};
47
48#ifdef BOOST_MSVC
49#pragma warning(pop)
50#endif
51
52#else
53
54#include <boost/type_traits/has_trivial_constructor.hpp>
55
56namespace boost {
57
58template <class T> struct has_nothrow_constructor : public ::boost::has_trivial_constructor<T> {};
59
60#endif
61
62template<> struct has_nothrow_constructor<void> : public false_type {};
63#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
64template<> struct has_nothrow_constructor<void const> : public false_type{};
65template<> struct has_nothrow_constructor<void const volatile> : public false_type{};
66template<> struct has_nothrow_constructor<void volatile> : public false_type{};
67#endif
68
69template <class T> struct has_nothrow_default_constructor : public has_nothrow_constructor<T>{};
70
71} // namespace boost
72
73#endif // BOOST_TT_HAS_NOTHROW_CONSTRUCTOR_HPP_INCLUDED
74

source code of boost/libs/type_traits/include/boost/type_traits/has_nothrow_constructor.hpp