new piDeleteSafety() method

CMakeLists.txt

@@ -3,7 +3,7 @@ cmake_policy(SET CMP0017 NEW) # need include() with .cmake
 project(PIP)
 set(PIP_MAJOR    3)
 set(PIP_MINOR    10)
-set(PIP_REVISION 1)
+set(PIP_REVISION 2)
 set(PIP_SUFFIX   )
 set(PIP_COMPANY  SHS)
 set(PIP_DOMAIN   org.SHS)

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>