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#include <iostream>
 
 
void foo ( long) { std::cout << "int\n " ; }
 
void foo ( int* ) { std::cout << "int*\n " ; }
 
//void foo ( std::nullptr_t ) { std::cout << "nullptr\n " ; }
 
 
int main() {
    foo ( NULL ) ;
    //foo ( nullptr ) ;
}

prog.cpp: In function ‘int main()’:
prog.cpp:12:16: error: call of overloaded ‘foo(NULL)’ is ambiguous
     foo ( NULL ) ;
                ^
prog.cpp:12:16: note: candidates are:
prog.cpp:4:6: note: void foo(long int)
 void foo ( long) { std::cout << "int\n " ; }
      ^
prog.cpp:6:6: note: void foo(int*)
 void foo ( int* ) { std::cout << "int*\n " ; }
      ^

Standard output is empty