intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 37 insertions, 0 deletions

diff --git a/library/cpp/yson_pull/reader.h b/library/cpp/yson_pull/reader.h
new file mode 100644
index 00000000000..f839b190713
--- /dev/null
+++ b/library/cpp/yson_pull/reader.h
@@ -0,0 +1,37 @@
+#pragma once
+
+#include "event.h"
+#include "input.h"
+#include "stream_type.h"
+
+#include <util/system/yassert.h>
+
+#include <memory>
+
+namespace NYsonPull {
+    namespace NDetail {
+        class reader_impl;
+    }
+
+    //! \brief YSON reader facade class.
+    //!
+    //! Owns an input stream.
+    class TReader {
+        THolder<NInput::IStream> Stream_;
+        THolder<NDetail::reader_impl> Impl_;
+
+    public:
+        TReader(THolder<NInput::IStream> stream, EStreamType mode);
+        TReader(TReader&&) noexcept;
+        ~TReader();
+
+        //! \brief Advance stream to next event and return it.
+        //!
+        //! Any event data is invalidated by a call to NextEvent();
+        const TEvent& NextEvent();
+
+        //! \brief Get last returned event.
+        const TEvent& LastEvent() const noexcept;
+    };
+
+}