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100 lines
2.1 KiB
C++
100 lines
2.1 KiB
C++
/*=============================================================================
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Copyright (c) 2014 Paul Fultz II
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fuse.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_FUSE_H
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#define FIT_GUARD_FUNCTION_FUSE_H
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/// !!DEPRECATED: Please use unpack instead.
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/// fuse
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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 `fuse` function adaptor takes a tuple and uses that for the arguments
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/// to the function.
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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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/// fuse_adaptor<F> fuse(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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/// Example
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/// -------
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///
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/// struct sum
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/// {
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/// template<class T, class U>
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/// T operator()(T x, U y) const
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/// {
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/// return x+y;
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/// }
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/// };
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///
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/// int r = fuse(sum())(std::make_tuple(3,2));
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/// assert(r == 5);
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///
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#include <fit/invoke.h>
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#include <fit/variadic.h>
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#include <fit/always.h>
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#include <fit/detail/delegate.h>
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#include <fit/detail/move.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 fuse_adaptor : F
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{
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FIT_INHERIT_CONSTRUCTOR(fuse_adaptor, F);
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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(fuse_adaptor);
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template<class T>
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constexpr auto operator()(T && x) const
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FIT_RETURNS
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(
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fit::invoke(FIT_MANGLE_CAST(const F&)(FIT_CONST_THIS->base_function(x)), fit::forward<T>(x))
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);
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};
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// Optimizations
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template<class F>
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struct fuse_adaptor<variadic_adaptor<F> > : F
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{
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FIT_INHERIT_CONSTRUCTOR(fuse_adaptor, F);
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};
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template<class F>
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struct variadic_adaptor<fuse_adaptor<F> > : F
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{
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FIT_INHERIT_CONSTRUCTOR(variadic_adaptor, F);
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};
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FIT_STATIC_CONSTEXPR detail::make<fuse_adaptor> fuse = {};
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}
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#endif
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