--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Implab/Diagnostics/OperationContext.cs	Wed Oct 22 18:37:56 2014 +0400
@@ -0,0 +1,49 @@
+namespace Implab.Diagnostics {
+    struct OperationContext {
+        readonly LogicalOperation m_initial;
+        public readonly static OperationContext EMPTY = new OperationContext(LogicalOperation.EMPTY, false);
+        LogicalOperation m_current;
+        readonly bool m_ownership;
+
+        public OperationContext(LogicalOperation operation, bool ownership) {
+            Safe.ArgumentNotNull(operation, "operation");
+
+            m_initial = operation;
+            m_current = operation;
+            m_ownership = ownership;
+        }
+
+        public LogicalOperation CurrentOperation {
+            get { return m_current; }
+        }
+
+        public void BeginLogicalOperation(string name) {
+            m_current = new LogicalOperation(name, m_current);
+        }
+
+        public LogicalOperation DetachLogicalOperation() {
+            var detached = m_current;
+            if (m_current != LogicalOperation.EMPTY) {
+                if (m_current != m_initial)
+                    m_current = m_current.Parent;
+                else if (m_ownership)
+                    m_current = LogicalOperation.EMPTY;
+                else
+                    detached = LogicalOperation.EMPTY;
+            }
+            TraceLog.TraceWarning("EndLogicalOperation can't be applied in the current context");
+            return detached;
+        }
+
+        public void EndLogicalOperation() {
+            if (m_current != m_initial) {
+                m_current = m_current.Parent;
+            } else if (m_current != null && m_ownership) {
+                m_current = null;
+            } else {
+                TraceLog.TraceWarning("EndLogicalOperation can't be applied in the current context");
+            }
+        }
+    }
+}
+