Function Map

native/thirdpart/flatbuffers/flexbuffers.h:1238–1242

  }

  template<typename F> size_t Map(F f) {
    auto start = StartMap();
    f();
    return EndMap(start);
  }
  template<typename F, typename T> size_t Map(F f, T &state) {
    auto start = StartMap();
    f(state);