* moved ErrnoMaintainer into its own header to be reusable.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37931 a95241bf-73f2-0310-859d-f6bbb57e9c96
2010-08-05 21:41:29 +00:00
parent a52ec87162
commit 2cb26c0ab0
3 changed files with 46 additions and 24 deletions
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2010, Oliver Tappe, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef _ERRNO_MAINTAINER_H
+#define _ERRNO_MAINTAINER_H
+
+
+#include <errno.h>
+
+
+namespace BPrivate {
+
+
+/**
+ * A helper class resetting errno to 0 if it has been set during the execution
+ * of ICU methods. Any changes of errno shall only be done by our callers.
+ */
+class ErrnoMaintainer {
+public:
+	ErrnoMaintainer()
+		: fErrnoUponEntry(errno)
+	{
+	}
+
+	~ErrnoMaintainer()
+	{
+		if (errno != 0 && fErrnoUponEntry == 0)
+			errno = 0;
+	}
+private:
+	int fErrnoUponEntry;
+};
+
+
+}	// namespace BPrivate
+
+
+#endif	// _ERRNO_MAINTAINER_H