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#include <cassert>
#include <iostream>
#include <utility>
using namespace std;
 
struct base { virtual ~base() {} };
 
template <typename T>
struct Foo : base {	T foo; };
 
int main() {
	base* test = new Foo<pair<int, int>>;
 
	assert(dynamic_cast<Foo<pair<int, int>>*>(test) != NULL);
 
	if(dynamic_cast<Foo<pair<int, int>>*>(test) != NULL) cout << "hello world\n";
}

prog.cpp:14:57: error: macro "assert" passed 2 arguments, but takes just 1
  assert(dynamic_cast<Foo<pair<int, int>>*>(test) != NULL);
                                                         ^
prog.cpp: In function 'int main()':
prog.cpp:14:2: error: 'assert' was not declared in this scope
  assert(dynamic_cast<Foo<pair<int, int>>*>(test) != NULL);
  ^

Standard output is empty