1 /* 2 @file is_noexcept 3 4 @Copyright Barrett Adair 2015-2017 5 Distributed under the Boost Software License, Version 1.0. 6 (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) 7 8 */ 9 10 #ifndef BOOST_CLBL_TRTS_IS_NOEXCEPT_HPP 11 #define BOOST_CLBL_TRTS_IS_NOEXCEPT_HPP 12 13 #include <boost/callable_traits/detail/core.hpp> 14 15 namespace boost { namespace callable_traits { 16 17 //[ is_noexcept_hpp 18 /*`[section:ref_is_noexcept is_noexcept] 19 [heading Header] 20 ``#include <boost/callable_traits/is_noexcept.hpp>`` 21 [heading Definition] 22 */ 23 24 // inherits from either std::true_type or std::false_type 25 template<typename T> 26 struct is_noexcept; 27 28 //<- 29 template<typename T> 30 struct is_noexcept : detail::traits<detail::shallow_decay<T>>::is_noexcept { 31 using type = typename detail::traits< 32 detail::shallow_decay<T>>::is_noexcept; 33 }; 34 35 #ifdef BOOST_CLBL_TRTS_DISABLE_VARIABLE_TEMPLATES 36 37 template<typename T> 38 struct is_noexcept_v { 39 static_assert(std::is_same<T, detail::dummy>::value, 40 "Variable templates not supported on this compiler."); 41 }; 42 43 #else 44 //-> 45 // only available when variable templates are supported 46 template<typename T> 47 //<- 48 BOOST_CLBL_TRAITS_INLINE_VAR 49 //-> 50 constexpr bool is_noexcept_v = //see below 51 //<- 52 detail::traits<detail::shallow_decay<T>>::is_noexcept::value; 53 54 #endif 55 56 }} // namespace boost::callable_traits 57 //-> 58 59 /*` 60 [heading Constraints] 61 * none 62 * 63 [heading Behavior] 64 * `is_noexcept<T>::value` is `true` when either: 65 * `T` is a function type, function pointer type, function reference type, or member function pointer type where the function has a `noexcept` specifier 66 * `T` is a function object with a non-overloaded `operator()`, where the `operator()` has a `noexcept` specifier 67 * On compilers that support variable templates, `is_noexcept_v<T>` is equivalent to `is_noexcept<T>::value`. 68 69 [heading Input/Output Examples] 70 [table 71 [[`T`] [`is_noexcept_v<T>`]] 72 [[`int() const noexcept`] [`true`]] 73 [[`int(* const &)() noexcept`] [`true`]] 74 [[`int(&)() noexcept`] [`true`]] 75 [[`int(foo::*)() noexcept`] [`true`]] 76 [[`int() const`] [`false`]] 77 [[`int() volatile`] [`false`]] 78 [[`int(foo::*)() const`] [`false`]] 79 [[`int() const`] [`false`]] 80 [[`int() volatile`] [`false`]] 81 [[`int() &`] [`false`]] 82 [[`int(*)()`] [`false`]] 83 [[`int`] [`false`]] 84 [[`int foo::*`] [`false`]] 85 [[`const int foo::*`] [`false`]] 86 ] 87 88 [heading Example Program] 89 [import ../example/is_noexcept.cpp] 90 [is_noexcept] 91 [endsect] 92 */ 93 //] 94 95 #endif // #ifndef BOOST_CLBL_TRTS_IS_NOEXCEPT_HPP 96