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70 lines
1.6 KiB
C++
70 lines
1.6 KiB
C++
/*=============================================================================
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Copyright (c) 2012 Paul Fultz II
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variadic.h
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#ifndef FIT_GUARD_FUNCTION_VARIADIC_H
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#define FIT_GUARD_FUNCTION_VARIADIC_H
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/// variadic
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/// ========
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///
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/// Description
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/// -----------
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///
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/// The `variadic` function adaptor converts the arguments to the function to a
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/// tuple.
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///
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/// Synopsis
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/// --------
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///
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/// template<class F>
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/// constexpr variadic_adaptor<F> variadic(F f);
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///
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/// Requirements
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/// ------------
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///
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/// F must be:
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///
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/// FunctionObject
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/// MoveConstructible
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///
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#include <fit/detail/ref_tuple.h>
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#include <fit/returns.h>
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#include <fit/always.h>
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#include <fit/detail/make.h>
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#include <fit/detail/static_constexpr.h>
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namespace fit {
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template<class F>
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struct variadic_adaptor : F
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{
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template<class... Ts>
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constexpr variadic_adaptor(Ts && ... x) : F(fit::forward<Ts>(x)...)
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{}
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template<class... Ts>
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constexpr const F& base_function(Ts&&... xs) const
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{
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return always_ref(*this)(xs...);
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}
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FIT_RETURNS_CLASS(variadic_adaptor);
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template<class... Ts>
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constexpr auto operator()(Ts && ... xs) const FIT_RETURNS
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(
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FIT_MANGLE_CAST(const F&)(FIT_CONST_THIS->base_function(xs...))(detail::make_ref_tuple(fit::forward<Ts>(xs)...))
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);
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};
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FIT_STATIC_CONSTEXPR detail::make<variadic_adaptor> variadic = {};
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}
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#endif
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