What are the most popular libraries and frameworks in the C++ ecosystem?

Popular libraries and frameworks in the C++ ecosystem include Boost (utilities, data structures, and algorithms), Qt (cross-platform application framework), Eigen (linear algebra calculations), FFmpeg (multimedia operations). These libraries and frameworks greatly simplify the development process and provide powerful support for building efficient and reliable C++ applications.

Popular Libraries and Frameworks in the C++ Ecosystem

The C++ ecosystem has many powerful libraries and frameworks that can greatly Simplify the development process. This article will introduce some of the most popular C++ libraries and frameworks, as well as their practical use cases.

Boost

The Boost library is a powerful and comprehensive collection of C++ libraries covering a variety of utilities, data structures, and algorithms.

Practical case:

#include <boost/array.hpp>

int main() {
  // 创建一个 boost::array
  boost::array<int, 5> my_array({1, 2, 3, 4, 5});

  // 遍历并打印数组的元素
  for (int i = 0; i < 5; ++i) {
    std::cout << my_array[i] << "\n";
  }

  return 0;
}

Qt

Qt is a cross-platform application framework that can be used to build desktop, mobile and Embedded applications.

Practical case:

#include <QtWidgets/QApplication>
#include <QtWidgets/QPushButton>

int main(int argc, char *argv[]) {
  QApplication app(argc, argv);
  QPushButton button("Hello, world!");
  button.show();

  return app.exec();
}

Eigen

Eigen is a high-performance C++ library suitable for linear algebra calculations.

Practical case:

// 两个矩阵相乘
#include <Eigen/Dense>

int main() {
  Eigen::MatrixXd A = Eigen::MatrixXd::Random(2, 2);
  Eigen::MatrixXd B = Eigen::MatrixXd::Random(2, 2);

  Eigen::MatrixXd C = A * B;
  std::cout << C << "\n";

  return 0;
}

FFmpeg

FFmpeg is a powerful multimedia framework that can be used to operate video and audio , pictures and other media files.

Practical examples:

// 将视频文件 A 转换成 MP4 格式
#include <libavformat/avformat.h>

int main() {
  avformat_open_input(&pFormatCtx, "input.mp4", NULL, NULL);

  AVFormatContext *pOutputCtx = avformat_alloc_context();
  pOutputCtx->oformat = av_guess_format("mp4", NULL, NULL);

  avformat_write_header(pOutputCtx, NULL);

  AVPacket packet;
  av_init_packet(&packet);

  while (av_read_frame(pFormatCtx, &packet) >= 0) {
    av_packet_rescale_ts(&packet, pFormatCtx->streams[packet.stream_index]->time_base, pOutputCtx->streams[packet.stream_index]->time_base);
    av_interleaved_write_frame(pOutputCtx, &packet);
    av_packet_unref(&packet);
  }

  av_write_trailer(pOutputCtx);

  return 0;
}

The above are just a few of the many popular libraries and frameworks in the C++ ecosystem. Choosing the right libraries and frameworks is critical to building efficient, reliable C++ applications.

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