indices.hpp

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// 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/detail/prologue.hpp>
 
namespace ranges
{
    namespace views
    {
        struct indices_fn : iota_view<std::size_t>
        {
            indices_fn() = default;
 
            template(typename Val)(
                requires integral<Val>)
            iota_view<Val, Val> operator()(Val to) const
            {
                return {Val(), to};
            }
            template(typename Val)(
                requires integral<Val>)
            iota_view<Val, Val> operator()(Val from, Val to) const
            {
                return {from, to};
            }
        };

        struct closed_indices_fn
        {
            template(typename Val)(
                requires integral<Val>)
            closed_iota_view<Val> operator()(Val to) const
            {
                return {Val(), to};
            }
            template(typename Val)(
                requires integral<Val>)
            closed_iota_view<Val> operator()(Val from, Val to) const
            {
                return {from, to};
            }
        };

        RANGES_INLINE_VARIABLE(indices_fn, indices)
 
        
        RANGES_INLINE_VARIABLE(closed_indices_fn, closed_indices)
    } // namespace views
} // namespace ranges
 
#include <range/v3/detail/epilogue.hpp>
 
#endif // RANGES_V3_VIEW_INDICES_HPP