Change NumericEvaluator::clear() to optionally accept an object to clear

common/libeval/numeric_evaluator.cpp

@@ -96,12 +96,14 @@ NumericEvaluator :: init()
 }
 
 void
-NumericEvaluator :: clear()
+NumericEvaluator :: clear(const void* pObj)
 {
    free(clToken.token);
    clToken.token = nullptr;
    clToken.input = nullptr;
    bClError = true;
+
+   if (bClTextInputStorage && pObj) clObjMap.erase(pObj);
 }
 
 void

include/libeval/numeric_evaluator.h

@@ -100,10 +100,10 @@ public:
    /* Initialization and destruction. init() is invoked be the constructor and should not be needed
     * by the user.
     * clear() should be invoked by the user if a new input string is to be processed. It will reset
-    * the parser. User defined variables are retained.
+    * the parser and clear the original expression value for a requested object (if pObj != null).
     */
    void init();
-   void clear();
+   void clear(const void* pObj = nullptr);
 
    /* Set the decimal separator for the input string. Defaults to '.' */
    void setDecimalSeparator(char sep);