mirror of https://github.com/axmolengine/axmol.git
101 lines
2.5 KiB
C++
101 lines
2.5 KiB
C++
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/// \file
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// Range v3 library
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//
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// Copyright Eric Niebler 2013-present
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//
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// Use, modification and distribution is subject to the
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// Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// Project home: https://github.com/ericniebler/range-v3
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//
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#ifndef RANGES_V3_FUNCTIONAL_INDIRECT_HPP
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#define RANGES_V3_FUNCTIONAL_INDIRECT_HPP
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#include <utility>
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#include <concepts/concepts.hpp>
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#include <range/v3/functional/invoke.hpp>
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#include <range/v3/iterator/traits.hpp>
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#include <range/v3/utility/move.hpp>
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#include <range/v3/utility/static_const.hpp>
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#include <range/v3/detail/prologue.hpp>
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namespace ranges
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{
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/// \addtogroup group-functional
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/// @{
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template<typename Fn>
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struct indirected
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{
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private:
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RANGES_NO_UNIQUE_ADDRESS
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Fn fn_;
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public:
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indirected() = default;
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indirected(Fn fn)
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: fn_(std::move(fn))
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{}
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// value_type (needs no impl)
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template<typename... Its>
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[[noreturn]] invoke_result_t<Fn &, iter_reference_t<Its>...> //
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operator()(copy_tag, Its...) const
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{
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RANGES_EXPECT(false);
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}
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// Reference
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// clang-format off
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template<typename... Its>
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auto CPP_auto_fun(operator())(Its... its)
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(
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return invoke(fn_, *its...)
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)
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template<typename... Its>
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auto CPP_auto_fun(operator())(Its... its)(const)
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(
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return invoke((Fn const &)fn_, *its...)
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)
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// Rvalue reference
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template<typename... Its>
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auto CPP_auto_fun(operator())(move_tag, Its... its)
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(
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return static_cast<
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aux::move_t<invoke_result_t<Fn &, iter_reference_t<Its>...>>>(
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aux::move(invoke(fn_, *its...)))
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)
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template<typename... Its>
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auto CPP_auto_fun(operator())(move_tag, Its... its)(const)
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(
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return static_cast<
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aux::move_t<invoke_result_t<Fn const &, iter_reference_t<Its>...>>>(
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aux::move(invoke((Fn const &)fn_, *its...)))
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)
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// clang-format on
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};
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struct indirect_fn
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{
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template<typename Fn>
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constexpr indirected<Fn> operator()(Fn fn) const
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{
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return indirected<Fn>{detail::move(fn)};
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}
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};
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/// \ingroup group-functional
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/// \sa `indirect_fn`
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RANGES_INLINE_VARIABLE(indirect_fn, indirect)
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/// @}
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} // namespace ranges
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#include <range/v3/detail/epilogue.hpp>
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#endif
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