Function CaptureStream

tests/gtest/gtest-all.cc:10870–10877

Starts capturing an output stream (stdout/stderr).

// Starts capturing an output stream (stdout/stderr).
static void CaptureStream(int fd, const char* stream_name,
                          CapturedStream** stream) {
  if (*stream != nullptr) {
    GTEST_LOG_(FATAL) << "Only one " << stream_name
                      << " capturer can exist at a time.";
  }
  *stream = new CapturedStream(fd);
}

// Stops capturing the output stream and returns the captured string.
static std::string GetCapturedStream(CapturedStream** captured_stream) {