fork download 
  1. #include <functional>
  2.  
  3. using namespace std;
  4.  
  5. template <typename ARGUEMENT, typename RESULT>
  6. class FunctorBase : public std::unary_function<ARGUEMENT, RESULT>
  7. {
  8. public:
  9.     virtual result_type operator () (argument_type) = 0;
  10.         FunctorBase() {}
  11.         virtual ~FunctorBase() {}
  12. };
  13.  
  14. int main()
  15. {
  16.     FunctorBase<int&, void>();
  17. }
  18.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
prog.cpp:9:13: error: ‘result_type’ does not name a type
prog.cpp:9:13: note: (perhaps ‘typename std::unary_function<_Arg, _Result>::result_type’ was intended)
stdout 
Standard output is empty
https://ideone.com/vttG8W
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!