#include <memory>
#include <iostream>

class CustomData
{
	int someValue;
	// ...
};

namespace std
{
	template<>
	struct default_delete<CustomData>
	{
		void operator()(CustomData* ptr)
		{
			cout << "deleted" << endl;
		}
	};
}

using namespace std;

int main()
{
	{
		auto ptr1 = make_unique<CustomData>();
	}
	{
		auto newData = new CustomData;
		auto ptr2 = unique_ptr<CustomData>(newData);
	}

	return 0;
}