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98 lines
2.8 KiB
C++
98 lines
2.8 KiB
C++
/*
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@Copyright Barrett Adair 2015-2017
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_CLBL_TRTS_IS_CONST_MEMBER_HPP
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#define BOOST_CLBL_TRTS_IS_CONST_MEMBER_HPP
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#include <boost/callable_traits/detail/core.hpp>
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namespace boost { namespace callable_traits {
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//[ is_const_member_hpp
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/*`[section:ref_is_const_member is_const_member]
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[heading Header]
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``#include <boost/callable_traits/is_const_member.hpp>``
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[heading Definition]
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*/
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// inherits from either std::true_type or std::false_type
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template<typename T>
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struct is_const_member;
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//<-
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template<typename T>
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struct is_const_member
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: detail::traits<detail::shallow_decay<T>>::is_const_member {
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using type = typename detail::traits<
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detail::shallow_decay<T>>::is_const_member;
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};
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#ifdef BOOST_CLBL_TRTS_DISABLE_VARIABLE_TEMPLATES
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template<typename T>
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struct is_const_member_v {
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static_assert(std::is_same<T, detail::dummy>::value,
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"Variable templates not supported on this compiler.");
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};
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#else
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//->
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// only available when variable templates are supported
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template<typename T>
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//<-
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BOOST_CLBL_TRAITS_INLINE_VAR
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//->
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constexpr bool is_const_member_v = //see below
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//<-
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detail::traits<detail::shallow_decay<T>>::is_const_member::value;
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#endif
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}} // namespace boost::callable_traits
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//->
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/*`
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[heading Constraints]
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* none
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[heading Behavior]
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* `is_const_member<T>::value` is `true` when either:
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* `T` is a function type with a `const` member qualifier
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* `T` is a pointer to a member function with a `const` member qualifier
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* `T` is a function object with a non-overloaded `operator()`, where the `operator()` has a `const` member qualifier
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* On compilers that support variable templates, `is_const_member_v<T>` is equivalent to `is_const_member<T>::value`.
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[heading Input/Output Examples]
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[table
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[[`T`] [`is_const_member_v<T>`]]
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[[`int() const`] [`true`]]
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[[`int() const volatile`] [`true`]]
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[[`int() const & transaction_safe`] [`true`]]
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[[`int() const &&`] [`true`]]
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[[`int(foo::*&)() const`] [`true`]]
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[[`int(foo::*)() const volatile`] [`true`]]
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[[`int(foo::*)() const volatile &&`][`true`]]
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[[`int(foo::* const)() const`] [`true`]]
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[[`int()`] [`false`]]
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[[`int() volatile`] [`false`]]
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[[`int() &&`] [`false`]]
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[[`int(*)()`] [`false`]]
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[[`int`] [`false`]]
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[[`int foo::*`] [`false`]]
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[[`const int foo::*`] [`false`]]
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]
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[heading Example Program]
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[import ../example/is_const_member.cpp]
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[is_const_member]
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[endsect]
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*/
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//]
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#endif // #ifndef BOOST_CLBL_TRTS_IS_CONST_MEMBER_HPP
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