intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 91 insertions, 0 deletions

diff --git a/library/cpp/coroutine/engine/iostatus.h b/library/cpp/coroutine/engine/iostatus.h
new file mode 100644
index 0000000000..bf6036805d
--- /dev/null
+++ b/library/cpp/coroutine/engine/iostatus.h
@@ -0,0 +1,91 @@
+#pragma once
+
+#include <util/generic/yexception.h>
+
+class TIOStatus {
+public:
+    TIOStatus(int status) noexcept
+        : Status_(status)
+    {
+    }
+
+    static TIOStatus Error(int status) noexcept {
+        return TIOStatus(status);
+    }
+
+    static TIOStatus Error() noexcept {
+        return TIOStatus(LastSystemError());
+    }
+
+    static TIOStatus Success() noexcept {
+        return TIOStatus(0);
+    }
+
+    void Check() const {
+        if (Status_) {
+            ythrow TSystemError(Status_) << "io error";
+        }
+    }
+
+    bool Failed() const noexcept {
+        return (bool)Status_;
+    }
+
+    bool Succeed() const noexcept {
+        return !Failed();
+    }
+
+    int Status() const noexcept {
+        return Status_;
+    }
+
+private:
+    int Status_;
+};
+
+
+class TContIOStatus {
+public:
+    TContIOStatus(size_t processed, TIOStatus status) noexcept
+        : Processed_(processed)
+        , Status_(status)
+    {
+    }
+
+    static TContIOStatus Error(TIOStatus status) noexcept {
+        return TContIOStatus(0, status);
+    }
+
+    static TContIOStatus Error() noexcept {
+        return TContIOStatus(0, TIOStatus::Error());
+    }
+
+    static TContIOStatus Success(size_t processed) noexcept {
+        return TContIOStatus(processed, TIOStatus::Success());
+    }
+
+    static TContIOStatus Eof() noexcept {
+        return Success(0);
+    }
+
+    ~TContIOStatus() {
+    }
+
+    size_t Processed() const noexcept {
+        return Processed_;
+    }
+
+    int Status() const noexcept {
+        return Status_.Status();
+    }
+
+    size_t Checked() const {
+        Status_.Check();
+
+        return Processed_;
+    }
+
+private:
+    size_t Processed_;
+    TIOStatus Status_;
+};