Remove empty-string comparisons.

webrtc/modules/video_coding/codecs/tools/video_quality_measurement.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 93 matching lines @@
     va_end(args);
   }
   return result;
 }
 
 // Validates the arguments given as command line flags and fills in the
 // TestConfig struct with all configurations needed for video processing.
 // Returns 0 if everything is OK, otherwise an exit code.
 int HandleCommandLineFlags(webrtc::test::TestConfig* config) {
   // Validate the mandatory flags:
-  if (FLAGS_input_filename == "" || FLAGS_width == -1 || FLAGS_height == -1) {
+  if (FLAGS_input_filename.empty() || FLAGS_width == -1 || FLAGS_height == -1) {
     printf("%s\n", google::ProgramUsage());
     return 1;
   }
   config->name = FLAGS_test_name;
   config->description = FLAGS_test_description;
 
   // Verify the input file exists and is readable.
   FILE* test_file;
   test_file = fopen(FLAGS_input_filename.c_str(), "rb");
   if (test_file == NULL) {
     fprintf(stderr, "Cannot read the specified input file: %s\n",
             FLAGS_input_filename.c_str());
     return 2;
   }
   fclose(test_file);
   config->input_filename = FLAGS_input_filename;
 
   // Verify the output dir exists.
   struct stat dir_info;
   if (!(stat(FLAGS_output_dir.c_str(), &dir_info) == 0 &&
       S_ISDIR(dir_info.st_mode))) {
     fprintf(stderr, "Cannot find output directory: %s\n",
               FLAGS_output_dir.c_str());
     return 3;
   }
   config->output_dir = FLAGS_output_dir;
 
   // Manufacture an output filename if none was given.
-  if (FLAGS_output_filename == "") {
+  if (FLAGS_output_filename.empty()) {
     // Cut out the filename without extension from the given input file
     // (which may include a path)
     int startIndex = FLAGS_input_filename.find_last_of("/") + 1;
     if (startIndex == 0) {
       startIndex = 0;
     }
     FLAGS_output_filename =
         FLAGS_input_filename.substr(startIndex,
                                     FLAGS_input_filename.find_last_of(".")
                                     - startIndex) + "_out.yuv";
@@ skipping 365 matching lines @@
   }
   if (FLAGS_python) {
     PrintPythonOutput(config, stats, ssim_result, psnr_result);
   }
   delete processor;
   delete encoder;
   delete decoder;
   Log("Quality test finished!");
   return 0;
 }