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98 lines
3.5 KiB
C++
98 lines
3.5 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_ARGS_HPP
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#define BOOST_CLBL_TRTS_ARGS_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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//[ args_hpp
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/*`[section:ref_args args]
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[heading Header]
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``#include <boost/callable_traits/args.hpp>``
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[heading Definition]
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*/
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template<typename T, template<class...> class Container = std::tuple>
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using args_t = //see below
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//<-
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detail::try_but_fail_if_invalid<
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typename detail::traits<
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detail::shallow_decay<T>>::template expand_args<Container>,
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cannot_expand_the_parameter_list_of_first_template_argument>;
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namespace detail {
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template<typename T, template<class...> class Container,
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typename = std::false_type>
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struct args_impl {};
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template<typename T, template<class...> class Container>
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struct args_impl <T, Container, typename std::is_same<
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args_t<T, Container>, detail::dummy>::type>
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{
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using type = args_t<T, Container>;
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};
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}
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//->
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template<typename T,
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template<class...> class Container = std::tuple>
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struct args : detail::args_impl<T, Container> {};
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//<-
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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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* `T` must be one of the following:
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* function
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* function pointer
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* function reference
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* member function pointer
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* member data pointer
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* user-defined type with a non-overloaded `operator()`
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* type of a non-generic lambda
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[heading Behavior]
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* When the constraints are violated, a substitution failure occurs.
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* When `T` is a function, function pointer, or function reference, the aliased type is `Container` instantiated with the function's parameter types.
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* When `T` is a function object, the aliased type is `Container` instantiated with the `T::operator()` parameter types.
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* 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.
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* 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`.
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[heading Input/Output Examples]
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[table
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[[`T`] [`args_t<T>`]]
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[[`void(float, char, int)`] [`std::tuple<float, char, int>`]]
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[[`void(*)(float, char, int)`] [`std::tuple<float, char, int`]]
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[[`void(&)(float, char, int)`] [`std::tuple<float, char, int`]]
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[[`void(float, char, int) const &&`][`std::tuple<float, char, int>`]]
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[[`void(*)()`] [`std::tuple<>`]]
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[[`void(foo::* const &)(float, char, int)`] [`std::tuple<foo&, float, char, int>`]]
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[[`int(foo::*)(int) const`] [`std::tuple<const foo&, int>`]]
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[[`void(foo::*)() volatile &&`] [`std::tuple<volatile foo &&>`]]
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[[`int foo::*`] [`std::tuple<const foo&>`]]
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[[`const int foo::*`] [`std::tuple<const foo&>`]]
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[[`int`] [(substitution failure)]]
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[[`int (*const)()`] [(substitution failure)]]
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]
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[heading Example Program]
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[import ../example/args.cpp]
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[args]
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[endsect]
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*/
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//]
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#endif // #ifndef BOOST_CLBL_TRTS_ARGS_HPP
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