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/* @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_ARGS_HPP #define BOOST_CLBL_TRTS_ARGS_HPP #include <boost/callable_traits/detail/core.hpp> namespace boost { namespace callable_traits { //[ args_hpp /*`[section:ref_args args] [heading Header] ``#include <boost/callable_traits/args.hpp>`` [heading Definition] */ template<typename T, template<class...> class Container = std::tuple> using args_t = //see below //<- detail::try_but_fail_if_invalid< typename detail::traits< detail::shallow_decay<T>>::template expand_args<Container>, cannot_expand_the_parameter_list_of_first_template_argument>; namespace detail { template<typename T, template<class...> class Container, typename = std::false_type> struct args_impl {}; template<typename T, template<class...> class Container> struct args_impl <T, Container, typename std::is_same< args_t<T, Container>, detail::dummy>::type> { using type = args_t<T, Container>; }; } //-> template<typename T, template<class...> class Container = std::tuple> struct args : detail::args_impl<T, Container> {}; //<- }} // namespace boost::callable_traits //-> /*` [heading Constraints] * `T` must be one of the following: * function * function pointer * function reference * member function pointer * member data pointer * user-defined type with a non-overloaded `operator()` * type of a non-generic lambda [heading Behavior] * When the constraints are violated, a substitution failure occurs. * When `T` is a function, function pointer, or function reference, the aliased type is `Container` instantiated with the function's parameter types. * When `T` is a function object, the aliased type is `Container` instantiated with the `T::operator()` parameter types. * When `T` is a member function pointer, the aliased type is a `Container` instantiation, where the first type argument is a reference to the parent class of `T`, qualified according to the member qualifiers on `T`, such that the first type is equivalent to `boost::callable_traits::qualified_class_of_t<T>`. The subsequent type arguments, if any, are the parameter types of the member function. * When `T` is a member data pointer, the aliased type is `Container` with a single element, which is a `const` reference to the parent class of `T`. [heading Input/Output Examples] [table [[`T`] [`args_t<T>`]] [[`void(float, char, int)`] [`std::tuple<float, char, int>`]] [[`void(*)(float, char, int)`] [`std::tuple<float, char, int`]] [[`void(&)(float, char, int)`] [`std::tuple<float, char, int`]] [[`void(float, char, int) const &&`][`std::tuple<float, char, int>`]] [[`void(*)()`] [`std::tuple<>`]] [[`void(foo::* const &)(float, char, int)`] [`std::tuple<foo&, float, char, int>`]] [[`int(foo::*)(int) const`] [`std::tuple<const foo&, int>`]] [[`void(foo::*)() volatile &&`] [`std::tuple<volatile foo &&>`]] [[`int foo::*`] [`std::tuple<const foo&>`]] [[`const int foo::*`] [`std::tuple<const foo&>`]] [[`int`] [(substitution failure)]] [[`int (*const)()`] [(substitution failure)]] ] [heading Example Program] [import ../example/args.cpp] [args] [endsect] */ //] #endif // #ifndef BOOST_CLBL_TRTS_ARGS_HPP
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