Question

How to overload the operators new and delete on inherited class in C++

Answer 1

#include <iostream>

class Base 
{
	public:
		Base(void) 
		{
		}
		virtual ~Base(void) noexcept
		{
		}
};

class Test : public Base 
{
	public:
		Test(void) : Base() 
		{
		}
		~Test(void) noexcept override 
		{
		}
		void *operator new (size_t) throw () 
		{
			std::cout << "Overloaded operator new" << std::endl;
			return ::new Test;
		}
		void operator delete (void*) noexcept 
		{
			std::cout << "Overloaded operator delete" << std::endl;
		}
};

int main() 
{
	Base *b = new Test();
	delete b;

	return 0;
}

/*
run:

Overloaded operator new
Overloaded operator delete

*/

 

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