blob: 0ab76a2bfbea01d2b2c789c6bdc21c244e33caf9 [file] [log] [blame]
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
* Copyright (c) 2013-2014 Regents of the University of California.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
*
* ndn-cxx library is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later version.
*
* ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
*
* You should have received copies of the GNU General Public License and GNU Lesser
* General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
* <http://www.gnu.org/licenses/>.
*
* See AUTHORS.md for complete list of ndn-cxx authors and contributors.
*/
#ifndef NDN_UTIL_INDENTED_STREAM_HPP
#define NDN_UTIL_INDENTED_STREAM_HPP
#include <ostream>
#include <sstream>
#include <string>
namespace ndn {
namespace util {
/**
* @brief Output to stream with specified indent or prefix
*
* For example, the following code:
*
* std::cout << "Hello" << std::endl;
* IndentedStream os1(std::cout, " [prefix] ");
* os1 << "," << "\n";
* {
* IndentedStream os2(os1, " [another prefix] ");
* os2 << "World!" << "\n";
* }
* // either os1 needs to go out of scope or call os1.flush()
*
* Will produce the following output:
*
* Hello
* [prefix] ,
* [prefix] [another prefix] World!
*
* Based on http://stackoverflow.com/a/2212940/2150331
*/
class IndentedStream : public std::ostream
{
public:
IndentedStream(std::ostream& os, const std::string& indent);
~IndentedStream();
private:
// Write a stream buffer that prefixes each line
class StreamBuf : public std::stringbuf
{
public:
StreamBuf(std::ostream& os, const std::string& indent);
virtual int
sync();
private:
std::ostream& m_output;
std::string m_indent;
};
StreamBuf m_buffer;
};
} // namespace util
} // namespace ndn
#endif // NDN_UTIL_INDENTED_STREAM_HPP