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