C++ programming language allows both auto(or stack allocated) and dynamically allocated objects. In java & C#, all objects must be dynamically allocated using new.
C++ supports stack allocated objects for the reason of runtime efficiency. Stack based objects are implicitly managed by C++ compiler. They are destroyed when they go out of scope and dynamically allocated objects must be manually released, using delete operator otherwise memory leak occurs. C++ doesn’t support automatic garbage collection approach used by languages such as Java & C#.
How do we achieve following behavior from a class ‘Test’ in C++?
Test* t = new Test; // should produce compile time error Test t; // OK
The idea of is to keep new operator function private so that new cannot be called. See the following program. Objects of ‘Test’ class cannot be created using new as new operator function is private in ‘Test’. If we uncomment the 2nd line of main(), the program would produce compile time error.
Constructor is called x = 9 Destructor is executed