Method Peek

library/cpp/json/rapidjson_helpers.h:30–48

    struct TInputStreamWrapper: TReadOnlyStreamBase {
        Ch Peek() const {
            if (!Eof) {
                if (Pos >= Sz) {
                    if (Sz < BUF_SIZE) {
                        Sz += Helper.Read(Buf + Sz, BUF_SIZE - Sz);
                    } else {
                        Sz = Helper.Read(Buf, BUF_SIZE);
                        Pos = 0;
                    }
                }

                if (Pos < Sz) {
                    return Buf[Pos];
                }
            }

            Eof = true;
            return 0;
        }

        Ch Take() {
            auto c = Peek();