mirror of https://github.com/axmolengine/axmol.git
61 lines
1.5 KiB
C++
61 lines
1.5 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_UTILITY_COPY_HPP
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#define RANGES_V3_UTILITY_COPY_HPP
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#include <concepts/concepts.hpp>
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#include <range/v3/range_fwd.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-utility
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/// @{
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namespace aux
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{
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struct copy_fn : copy_tag
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{
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template(typename T)(
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requires constructible_from<detail::decay_t<T>, T>)
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constexpr auto operator()(T && t) const -> detail::decay_t<T>
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{
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return static_cast<T &&>(t);
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}
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/// \ingroup group-utility
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/// \sa `copy_fn`
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template<typename T>
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friend constexpr auto operator|(T && t, copy_fn)
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-> CPP_broken_friend_ret(detail::decay_t<T>)(
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requires constructible_from<detail::decay_t<T>, T>)
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{
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return static_cast<T &&>(t);
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}
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};
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/// \ingroup group-utility
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/// \sa `copy_fn`
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RANGES_INLINE_VARIABLE(copy_fn, copy)
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} // namespace aux
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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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