mirror of https://github.com/axmolengine/axmol.git
71 lines
2.0 KiB
C++
71 lines
2.0 KiB
C++
/// \file
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// Range v3 library
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//
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// Copyright Eric Niebler 2014-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_ITERATOR_UNREACHABLE_SENTINEL_HPP
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#define RANGES_V3_ITERATOR_UNREACHABLE_SENTINEL_HPP
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#include <range/v3/range_fwd.hpp>
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#include <range/v3/iterator/concepts.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-iterator
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/// @{
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struct unreachable_sentinel_t
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{
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template<typename I>
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friend constexpr auto operator==(I const &, unreachable_sentinel_t) noexcept
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-> CPP_broken_friend_ret(bool)(
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requires weakly_incrementable<I>)
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{
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return false;
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}
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template<typename I>
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friend constexpr auto operator==(unreachable_sentinel_t, I const &) noexcept
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-> CPP_broken_friend_ret(bool)(
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requires weakly_incrementable<I>)
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{
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return false;
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}
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template<typename I>
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friend constexpr auto operator!=(I const &, unreachable_sentinel_t) noexcept
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-> CPP_broken_friend_ret(bool)(
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requires weakly_incrementable<I>)
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{
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return true;
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}
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template<typename I>
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friend constexpr auto operator!=(unreachable_sentinel_t, I const &) noexcept
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-> CPP_broken_friend_ret(bool)(
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requires weakly_incrementable<I>)
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{
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return true;
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}
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};
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RANGES_INLINE_VARIABLE(unreachable_sentinel_t, unreachable)
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namespace cpp20
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{
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using ranges::unreachable;
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using ranges::unreachable_sentinel_t;
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} // namespace cpp20
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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 // RANGES_V3_ITERATOR_UNREACHABLE_SENTINEL_HPP
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