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https://github.com/PurpleI2P/Boost-for-Android-Prebuilt
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69 lines
1.9 KiB
C++
69 lines
1.9 KiB
C++
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/*=============================================================================
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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 BOOST_HOF_GUARD_FUNCTION_MUTABLE_H
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#define BOOST_HOF_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](MutableFunctionObject)
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/// * MoveConstructible
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///
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#include <boost/hof/detail/result_of.hpp>
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#include <boost/hof/detail/delegate.hpp>
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#include <boost/hof/detail/move.hpp>
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#include <boost/hof/detail/make.hpp>
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#include <boost/hof/detail/static_const_var.hpp>
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namespace boost { namespace hof {
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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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BOOST_HOF_DELEGATE_CONSTRUCTOR(mutable_adaptor, F, f);
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BOOST_HOF_RETURNS_CLASS(mutable_adaptor);
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template<class... Ts>
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BOOST_HOF_SFINAE_RESULT(F, id_<Ts>...)
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operator()(Ts&&... xs) const BOOST_HOF_SFINAE_RETURNS(BOOST_HOF_CONST_THIS->f(BOOST_HOF_FORWARD(Ts)(xs)...));
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};
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BOOST_HOF_DECLARE_STATIC_VAR(mutable_, detail::make<mutable_adaptor>);
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}} // namespace boost::hof
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#endif
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