Stream.hpp

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// The Reactive C++ Toolbox.
// Copyright (C) 2013-2019 Swirly Cloud Limited
// Copyright (C) 2021 Reactive Markets Limited
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
#ifndef TOOLBOX_IO_STREAM_HPP
#define TOOLBOX_IO_STREAM_HPP
 
#include <toolbox/io/Buffer.hpp>
#include <toolbox/util/Stream.hpp>
 
namespace toolbox {
inline namespace io {
 
class TOOLBOX_API StreamBuf final : public std::streambuf {
  public:
    explicit StreamBuf(Buffer& buf) noexcept
    : buf_{buf}
    {
    }
    ~StreamBuf() override;
 
    // Copy.
    StreamBuf(const StreamBuf&) = delete;
    StreamBuf& operator=(const StreamBuf&) = delete;
 
    // Move.
    StreamBuf(StreamBuf&&) = delete;
    StreamBuf& operator=(StreamBuf&&) = delete;
 
    void commit() noexcept { buf_.commit(pcount_); }
    void reset() noexcept
    {
        pbase_ = nullptr;
        pcount_ = 0;
    }
 
  protected:
    int_type overflow(int_type c) noexcept override;
    std::streamsize xsputn(const char_type* s, std::streamsize count) noexcept override;
 
  private:
    Buffer& buf_;
    char* pbase_{nullptr};
    std::streamsize pcount_{0};
};
 
class TOOLBOX_API OStream final : public std::ostream {
  public:
    explicit OStream(Buffer& buf) noexcept
    : std::ostream{nullptr}
    , buf_{buf}
    {
        rdbuf(&buf_);
    }
    ~OStream() override;
 
    // Copy.
    OStream(const OStream&) = delete;
    OStream& operator=(const OStream&) = delete;
 
    // Move.
    OStream(OStream&&) = delete;
    OStream& operator=(OStream&&) = delete;
 
    void commit() noexcept { buf_.commit(); }
    void reset() noexcept
    {
        buf_.reset();
        *this << reset_state;
    }
 
  private:
    StreamBuf buf_;
};
 
} // namespace io
} // namespace toolbox
 
#endif // TOOLBOX_IO_STREAM_HPP