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68 lines
1.7 KiB
C++
68 lines
1.7 KiB
C++
/*=============================================================================
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Copyright (c) 2014 Paul Fultz II
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mutable.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_MUTABLE_H
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#define FIT_GUARD_FUNCTION_MUTABLE_H
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/// mutable
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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 `mutable` function adaptor allows using a non-const function object
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/// inside of a const-function object. In Fit, all the function adaptors use
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/// `const` call overloads, so if there is a function that has a non-const
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/// call operator, it couldn't be used directly. So, `mutable_` allows the
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/// function to be used inside of the call operator.
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///
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/// NOTE: This function should be used with caution since many functions are
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/// copied, so relying on some internal shared state can be error-prone.
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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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/// mutable_adaptor<F> mutable_(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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/// MutableFunctionObject
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/// MoveConstructible
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///
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#include <fit/returns.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 mutable_adaptor
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{
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mutable F f;
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FIT_DELGATE_CONSTRUCTOR(mutable_adaptor, F, f);
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FIT_RETURNS_CLASS(mutable_adaptor);
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template<class... Ts>
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auto operator()(Ts&&... xs) const FIT_RETURNS(FIT_CONST_THIS->f(fit::forward<Ts>(xs)...));
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};
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FIT_STATIC_CONSTEXPR detail::make<mutable_adaptor> mutable_ = {};
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}
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#endif
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