C++ 생태계에서 가장 인기 있는 라이브러리와 프레임워크는 무엇입니까?

#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;
}

#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();
}

// 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;
}

// 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;
}