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  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
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stdin
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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
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Standard output is empty
https://ideone.com/vttG8W
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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