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#include <iostream>
using namespace std;
 
template <class, class=void> struct is_complete : std::false_type {};
template <class T>
struct is_complete<T, decltype(void(sizeof(T)))> : std::true_type {};	
 
struct A;
struct Foo {};
int main() {
 
	is_complete<Foo>::value;
	static_assert(is_complete<Foo>::value, "Type is not defined!");
 
	is_complete<A>::value;
    static_assert(is_complete<A>::value, "Type is not defined!");
	return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:16:5: error: static assertion failed: Type is not defined!
     static_assert(is_complete<A>::value, "Type is not defined!");
     ^

Standard output is empty