yaml-cpp/include/yaml-cpp/ostream_wrapper.h

#ifndef OSTREAM_WRAPPER_H_62B23520_7C8E_11DE_8A39_0800200C9A66
#define OSTREAM_WRAPPER_H_62B23520_7C8E_11DE_8A39_0800200C9A66

#if defined(_MSC_VER) ||                                            \
    (defined(__GNUC__) && (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || \
     (__GNUC__ >= 4))  // GCC supports "pragma once" correctly since 3.4
#pragma once
#endif

#include <string>
#include <vector>

#include "yaml-cpp/dll.h"

namespace YAML {
class YAML_CPP_API ostream_wrapper {
 public:
  ostream_wrapper();
  explicit ostream_wrapper(std::ostream& stream);
  ~ostream_wrapper();

  void write(const std::string& str);
  void write(const char* str, std::size_t size);

  void set_comment() { m_comment = true; }

  const char* str() const {
    if (m_pStream) {
      return 0;
    } else {
      m_buffer[m_pos] = '\0';
      return &m_buffer[0];
    }
  }

  std::size_t row() const { return m_row; }
  std::size_t col() const { return m_col; }
  std::size_t pos() const { return m_pos; }
  bool comment() const { return m_comment; }

 private:
  void update_pos(char ch);

 private:
  mutable std::vector<char> m_buffer;
  std::ostream* const m_pStream;

  std::size_t m_pos;
  std::size_t m_row, m_col;
  bool m_comment;
};

template <std::size_t N>
inline ostream_wrapper& operator<<(ostream_wrapper& stream,
                                   const char(&str)[N]) {
  stream.write(str, N - 1);
  return stream;
}

inline ostream_wrapper& operator<<(ostream_wrapper& stream,
                                   const std::string& str) {
  stream.write(str);
  return stream;
}

inline ostream_wrapper& operator<<(ostream_wrapper& stream, char ch) {
  stream.write(&ch, 1);
  return stream;
}
}

#endif  // OSTREAM_WRAPPER_H_62B23520_7C8E_11DE_8A39_0800200C9A66