added AmArg::clear function

git-svn-id: http://svn.berlios.de/svnroot/repos/sems/trunk@1038 8eb893ce-cfd4-0310-b710-fb5ebe64c474

core/AmArg.cpp

@@ -326,3 +326,6 @@ vector<ArgBlob> AmArg::asArgBlobVector() const {
   return res;					
 }			
 
+void AmArg::clear() {
+  invalidate();
+}

core/AmArg.h

@@ -268,6 +268,8 @@ class AmArg
    *   e.g. "ssif" -> [cstr, cstr, int, double]
    */
   void assertArrayFmt(const char* format) const;
+
+  void clear();
 };
 
 #endif