fix operator bool of cow shared pointer

alib2std/src/extensions/memory.hpp

@@ -109,7 +109,7 @@ public:
 	}
 	explicit operator bool( ) const {
-		return getUseCount ( ) == 0;
+		return getUseCount ( ) != 0;
 	}
 private:
@@ -232,7 +232,7 @@ public:
 	}
 	explicit operator bool( ) const {
-		return getUseCount ( ) == 0;
+		return getUseCount ( ) != 0;
 	}
 private: