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Editing: function_type.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_FUNCTION_TYPE_HPP #define BOOST_CLBL_TRTS_FUNCTION_TYPE_HPP #include <boost/callable_traits/detail/core.hpp> namespace boost { namespace callable_traits { //[ function_type_hpp /*`[section:ref_function_type function_type] [heading Header] ``#include <boost/callable_traits/function_type.hpp>`` [heading Definition] */ template<typename T> using function_type_t = //see below //<- detail::try_but_fail_if_invalid<typename detail::traits< detail::shallow_decay<T>>::function_type, cannot_determine_parameters_for_this_type>; namespace detail { template<typename T, typename = std::false_type> struct function_type_impl {}; template<typename T> struct function_type_impl <T, typename std::is_same< function_type_t<T>, detail::dummy>::type> { using type = function_type_t<T>; }; } //-> template<typename T> struct function_type : detail::function_type_impl<T> {}; //<- }} // 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, the aliased type is identical to `T`, except that the aliased function type will not have member qualifiers or the `transaction_safe` specifier. * When `T` is a function pointer, the aliased type is equivalent to `std::remove_pointer_t<T>`. * When `T` is a function reference, the aliased type is equivalent to `std::remove_reference_t<T>`. * When `T` is a function object, the aliased type is a function type with the same return type and parameter list as `T`'s `operator()`. * When `T` is a member function pointer, the aliased type is a function type with the same return type as `T`, and the first parameter is a reference to the parent class of `T`, qualified according to the member qualifiers on `T`. The subsequent parameters, if any, are the parameter types of `T`. * When `T` is a member data pointer, the aliased type is a function type returning the underlying member type of `T`, taking a single parameter, which is a `const` reference to the parent type of `T`. * In all cases, the aliased function type will not have member qualifiers, and will not have the `transaction_safe` specifier. [heading Input/Output Examples] [table [[`T`] [`function_type_t<T>`]] [[`void(int)`] [`void(int)`]] [[`void(int) const`] [`void(int)`]] [[`void(int) transaction_safe`] [`void(int)`]] [[`void(*const &)(int)`] [`void(int)`]] [[`void(&)(int)`] [`void(int)`]] [[`void(* volatile)()`] [`void()`]] [[`int(foo::*)(int)`] [`int(foo&, int)`]] [[`int(foo::*)(int) const`] [`int(const foo&, int)`]] [[`void(foo::*)() volatile &&`] [`void(volatile foo&&)`]] [[`int foo::*`] [`int(const foo&)`]] [[`const int foo::*`] [`int(const foo&)`]] [[`int`] [(substitution failure)]] ] [heading Example Program] [import ../example/function_type.cpp] [function_type] [endsect] */ //] #endif
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