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Editing: add_member_lvalue_reference.hpp
/* @Copyright Barrett Adair 2015-2018 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_ADD_MEMBER_LVALUE_REFERENCE_HPP #define BOOST_CLBL_TRTS_ADD_MEMBER_LVALUE_REFERENCE_HPP #include <boost/callable_traits/detail/core.hpp> namespace boost { namespace callable_traits { //[ add_member_lvalue_reference_hpp /*` [section:ref_add_member_lvalue_reference add_member_lvalue_reference] [heading Header] ``#include <boost/callable_traits/add_member_lvalue_reference.hpp>`` [heading Definition] */ //<- #ifdef BOOST_CLBL_TRTS_DISABLE_REFERENCE_QUALIFIERS template<typename T> struct add_member_lvalue_reference_t { static_assert(std::is_same<T, detail::dummy>::value, "Reference member qualifiers are not supported by this configuration."); }; #else //-> template<typename T> using add_member_lvalue_reference_t = //see below //<- #ifdef BOOST_CLBL_TRTS_DISABLE_ABOMINABLE_FUNCTIONS detail::sfinae_try< typename detail::traits<T>::add_member_lvalue_reference, detail::fail_when_same<typename detail::traits<T>::add_member_lvalue_reference, detail::abominable_functions_not_supported_on_this_compiler, this_compiler_doesnt_support_abominable_function_types>, detail::fail_if_invalid< typename detail::traits<T>::add_member_lvalue_reference, member_qualifiers_are_illegal_for_this_type>>; #else detail::try_but_fail_if_invalid< typename detail::traits<T>::add_member_lvalue_reference, member_qualifiers_are_illegal_for_this_type>; #endif // #ifdef BOOST_CLBL_TRTS_DISABLE_ABOMINABLE_FUNCTIONS #endif // #ifdef BOOST_CLBL_TRTS_DISABLE_REFERENCE_QUALIFIERS namespace detail { template<typename T, typename = std::false_type> struct add_member_lvalue_reference_impl {}; template<typename T> struct add_member_lvalue_reference_impl <T, typename std::is_same< add_member_lvalue_reference_t<T>, detail::dummy>::type> { using type = add_member_lvalue_reference_t<T>; }; } //-> template<typename T> struct add_member_lvalue_reference : detail::add_member_lvalue_reference_impl<T> {}; //<- }} // namespace boost::callable_traits //-> /*` [heading Constraints] * `T` must be a function type or a member function pointer type * If `T` is a pointer, it may not be cv/ref qualified [heading Behavior] * A substitution failure occurs if the constraints are violated. * Adds a member lvalue reference qualifier (`&`) to `T`, if not already present. * If an rvalue reference qualifier is present, the lvalue reference qualifier replaces it (in accordance with reference collapsing rules). [heading Input/Output Examples] [table [[`T`] [`add_member_lvalue_reference_t<T>`]] [[`int()`] [`int() &`]] [[`int(foo::*)()`] [`int(foo::*)() &`]] [[`int(foo::*)() &`] [`int(foo::*)() &`]] [[`int(foo::*)() &&`] [`int(foo::*)() &`]] [[`int(foo::*)() const`] [`int(foo::*)() const &`]] [[`int(foo::*)() transaction_safe`] [`int(foo::*)() & transaction_safe`]] [[`int`] [(substitution failure)]] [[`int (&)()`] [(substitution failure)]] [[`int (*)()`] [(substitution failure)]] [[`int foo::*`] [(substitution failure)]] [[`int (foo::* const)()`] [(substitution failure)]] ] [heading Example Program] [import ../example/add_member_lvalue_reference.cpp] [add_member_lvalue_reference] [endsect] */ //] #endif
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