Method Tell

include/cereal/external/rapidjson/stream.h:161–161

    Ch Peek() const { return *src_; }
    Ch Take() { return *src_++; }
    size_t Tell() const { return static_cast<size_t>(src_ - head_); }

    Ch* PutBegin() { CEREAL_RAPIDJSON_ASSERT(false); return 0; }
    void Put(Ch) { CEREAL_RAPIDJSON_ASSERT(false); }