*** empty log message ***

src/utils/cancelcheck.h

@@ -0,0 +1,31 @@
+#ifndef _CANCELCHECK_H_INCLUDED_
+#define _CANCELCHECK_H_INCLUDED_
+/* @(#$Id: cancelcheck.h,v 1.1 2006-01-27 13:43:31 dockes Exp $  (C) 2005 J.F.Dockes */
+
+
+class CancelExcept {};
+
+class CancelCheck {
+ public:
+    static CancelCheck& instance() {
+	static CancelCheck ck;
+	return ck;
+    }
+    void setCancel(bool on = true) {
+	cancelRequested = on;
+    }
+    void checkCancel() {
+	if (cancelRequested) {
+	    cancelRequested = false;
+	    throw CancelExcept();
+	}
+    }
+ private:
+    bool cancelRequested;
+
+    CancelCheck() : cancelRequested(false) {}
+    CancelCheck& operator=(CancelCheck&);
+    CancelCheck(const CancelCheck&);
+};
+
+#endif /* _CANCELCHECK_H_INCLUDED_ */