C++ アプリで flatbuffers でシリアライズされたメッセージを読み込む

# [flatbuffers]
set(FLATBUFFERS_BUILD_TESTS Off CACHE INTERNAL "" FORCE)
set(FLATBUFFERS_BUILD_FLATHASH Off CACHE INTERNAL "" FORCE)
set(FLATBUFFERS_INSTALL Off CACHE INTERNAL "" FORCE)

add_subdirectory(${CMAKE_SOURCE_DIR}/third_party/flatbuffers)

...

target_link_libraries(app flatbuffers)

  // load FlatBuffer schema (.fbs) and JSON from disk
  std::string schemafile;
  std::string jsonfile;
  bool ok = flatbuffers::LoadFile("../schema/config.fbs", false, &schemafile) &&
            flatbuffers::LoadFile("../config.json", false, &jsonfile);
  if (!ok) {
    printf("couldn't load files!\n");
    return 1;
  }

  // parse schema first, so we can use it to parse the data after
  flatbuffers::Parser parser;
  const char *include_directories[] = { nullptr };
  ok = parser.Parse(schemafile.c_str(), include_directories) &&
       parser.Parse(jsonfile.c_str(), include_directories);
  if (!ok) {
    std::cerr << "Parse error: " << parser.error_ << std::endl;
    return 1;
  }

  const App::Config *config = App::GetConfig(parser.builder_.GetBufferPointer());
  std::cout << config->pos()->x() << ", " << config->pos()->y() << ", " << config->pos()->z() << std::endl;