istreambuf_view.hpp

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// SPDX-FileCopyrightText: 2006-2025 Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2025 Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: BSD-3-Clause

 
#pragma once
 
#include <iosfwd>
#include <iterator>
#include <ranges>
 
#include <seqan3/io/stream/concept.hpp>
#include <seqan3/io/stream/detail/fast_istreambuf_iterator.hpp>
 
namespace seqan3::detail
{
 
// ============================================================================
//  istreambuf_fn (adaptor definition)
// ============================================================================

struct istreambuf_fn
{
    template <typename stream_char_t, typename stream_traits_t>
    constexpr auto operator()(std::basic_streambuf<stream_char_t, stream_traits_t> & s) const
    {
        return std::ranges::subrange<detail::fast_istreambuf_iterator<stream_char_t, stream_traits_t>,
                                     std::default_sentinel_t>{
            detail::fast_istreambuf_iterator<stream_char_t, stream_traits_t>{s},
            std::default_sentinel_t{}};
    }

    template <input_stream stream_t>
    constexpr auto operator()(stream_t & s) const
    {
        return this->operator()(*s.rdbuf());
    }
};
 
} // namespace seqan3::detail
 
// ============================================================================
//  detail::istreambuf (adaptor instance definition)
// ============================================================================
 
namespace seqan3::detail
{
inline constexpr auto istreambuf = detail::istreambuf_fn{};
 
} // namespace seqan3::detail