/// \file // Range v3 library // // Copyright Eric Niebler 2013-present // Copyright Gonzalo Brito Gadeschi // // Use, modification and distribution is subject to the // Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) // // Project home: https://github.com/ericniebler/range-v3 // #ifndef RANGES_V3_VIEW_INDICES_HPP #define RANGES_V3_VIEW_INDICES_HPP #include <meta/meta.hpp> #include <range/v3/range_fwd.hpp> #include <range/v3/range/concepts.hpp> #include <range/v3/utility/static_const.hpp> #include <range/v3/view/iota.hpp> #include <range/v3/view/take_exactly.hpp> namespace ranges { namespace views { /// Half-open range of indices: [from, to). struct indices_fn : iota_view<std::size_t> { indices_fn() = default; template<typename Val> auto operator()(Val to) const -> CPP_ret(iota_view<Val, Val>)( // requires integral<Val>) { return {Val(), to}; } template<typename Val> auto operator()(Val from, Val to) const -> CPP_ret(iota_view<Val, Val>)( // requires integral<Val>) { return {from, to}; } }; /// Inclusive range of indices: [from, to]. struct closed_indices_fn { template<typename Val> auto operator()(Val to) const -> CPP_ret(closed_iota_view<Val>)( // requires integral<Val>) { return {Val(), to}; } template<typename Val> auto operator()(Val from, Val to) const -> CPP_ret(closed_iota_view<Val>)( // requires integral<Val>) { return {from, to}; } }; /// \relates indices_fn /// \ingroup group-views RANGES_INLINE_VARIABLE(indices_fn, indices) /// \relates closed_indices_fn /// \ingroup group-views RANGES_INLINE_VARIABLE(closed_indices_fn, closed_indices) } // namespace views } // namespace ranges #endif // RANGES_V3_VIEW_INDICES_HPP