Function Peek

Source/ThirdParty/rapidjson/memorystream.h:45–45

    MemoryStream(const Ch *src, size_t size) : src_(src), begin_(src), end_(src + size), size_(size) {}

    Ch Peek() const { return RAPIDJSON_UNLIKELY(src_ == end_) ? '\0' : *src_; }
    Ch Take() { return RAPIDJSON_UNLIKELY(src_ == end_) ? '\0' : *src_++; }
    size_t Tell() const { return static_cast<size_t>(src_ - begin_); }