#include <iostream>
 
const int size = 1024;
char pool[size];
int nextFree = 0;
 
class A
{
public:
	int i = 123; // some data
 
	A() { std::cout << "constructor\n"; }
	~A() { std::cout << "destructor\n"; }
 
	static void* operator new(std::size_t size) noexcept
	{
		void *ptr = &pool[nextFree];
		nextFree += size;
		return ptr;
	}
 
	static void operator delete(void* ptr, std::size_t size) noexcept
	{
		//memset(ptr, 0, size); for example
	}
};
 
int main()
{
	A* a = new A();
	std::cout << std::boolalpha << (a == reinterpret_cast<A*>(&pool[0])) << std::endl;
	delete a;
}

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