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#include <iostream>
#include <memory>
 
template<typename T>
struct Animal {
    Animal()  {		std::cout << "Animal" << std::endl;	}
	~Animal() {		std::cout << "~Animal" << std::endl;}
};
 
struct Cat {
	Cat()  {	std::cout << "Cat" << std::endl;	}
	~Cat() {	std::cout << "~Cat" << std::endl;	}
};
 
int main() {
	std::unique_ptr<Animal<Cat>, void(*)(Animal<Cat>*)> ptr;
	ptr = std::unique_ptr<Animal<Cat>, void(*)(Animal<Cat>*)>(new Animal<Cat>, [](Animal<Cat> *ls) {
		delete ls;
	});
/*
	std::unique_ptr<Animal<Cat>, void(*)(Animal<Cat>*)> ptr(new Animal<Cat>, [](Animal<Cat> *ls) {
		delete ls;
	});
*/
	return 0;
}
 

In file included from /usr/include/c++/4.7/memory:86:0,
                 from prog.cpp:2:
/usr/include/c++/4.7/bits/unique_ptr.h: In instantiation of ‘constexpr std::unique_ptr<_Tp, _Dp>::unique_ptr() [with _Tp = Animal<Cat>; _Dp = void (*)(Animal<Cat>*)]’:
prog.cpp:16:54:   required from here
/usr/include/c++/4.7/bits/unique_ptr.h:116:9: error: static assertion failed: constructed with null function pointer deleter

Standard output is empty