istreambuf_view.hpp

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// -----------------------------------------------------------------------------------------------------
// Copyright (c) 2006-2022, Knut Reinert & Freie Universität Berlin
// Copyright (c) 2016-2022, Knut Reinert & MPI für molekulare Genetik
// This file may be used, modified and/or redistributed under the terms of the 3-clause BSD-License
// shipped with this file and also available at: https://github.com/seqan/seqan3/blob/master/LICENSE.md
// -----------------------------------------------------------------------------------------------------
 
#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