85 lines
2.2 KiB
C++
85 lines
2.2 KiB
C++
/// \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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// Copyright Gonzalo Brito Gadeschi
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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_VIEW_INDICES_HPP
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#define RANGES_V3_VIEW_INDICES_HPP
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#include <meta/meta.hpp>
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#include <range/v3/range_fwd.hpp>
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#include <range/v3/range/concepts.hpp>
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#include <range/v3/utility/static_const.hpp>
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#include <range/v3/view/iota.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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namespace views
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{
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/// Half-open range of indices: [from, to).
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struct indices_fn : iota_view<std::size_t>
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{
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indices_fn() = default;
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template(typename Val)(
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/// \pre
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requires integral<Val>)
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iota_view<Val, Val> operator()(Val to) const
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{
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return {Val(), to};
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}
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template(typename Val)(
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/// \pre
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requires integral<Val>)
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iota_view<Val, Val> operator()(Val from, Val to) const
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{
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return {from, to};
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}
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};
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/// Inclusive range of indices: [from, to].
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struct closed_indices_fn
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{
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template(typename Val)(
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/// \pre
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requires integral<Val>)
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closed_iota_view<Val> operator()(Val to) const
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{
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return {Val(), to};
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}
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template(typename Val)(
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/// \pre
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requires integral<Val>)
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closed_iota_view<Val> operator()(Val from, Val to) const
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{
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return {from, to};
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}
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};
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/// \relates indices_fn
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/// \ingroup group-views
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RANGES_INLINE_VARIABLE(indices_fn, indices)
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/// \relates closed_indices_fn
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/// \ingroup group-views
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RANGES_INLINE_VARIABLE(closed_indices_fn, closed_indices)
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} // namespace views
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} // namespace ranges
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#include <range/v3/detail/epilogue.hpp>
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#endif // RANGES_V3_VIEW_INDICES_HPP
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