new piDeleteSafety() method

libs/main/core/pibase.h

@@ -974,6 +974,14 @@ inline void piDeleteAllAndClear(T & container) {
 	container.clear();
 }
 
+template<typename T>
+inline bool piDeleteSafety(T *& pointer) {
+	if (!pointer) return false;
+	delete pointer;
+	pointer = nullptr;
+	return true;
+}
+
 #define piRoundf   piRound<float>
 #define piRoundd   piRound<double>
 #define piComparef piCompare<float>