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  1. #include <iostream>
  2. #include <string>
  3.  
  4. class Foo {
  5.     //... 
  6. public:
  7.     static Foo & getInstance() {
  8.         static Foo instance;
  9.         return instance;
  10.     }
  11.     template <typename V, typename ...X>
  12.     void DoJob (V verify, X... x) {
  13.         verify(x...);
  14.     } 
  15. };
  16.  
  17. struct Vvoid {
  18.     void operator () (void) { std::cout << __PRETTY_FUNCTION__ << '\n'; }
  19. };
  20.  
  21. struct Vstring {
  22.     void operator () (std::string msg) {
  23.     	std::cout << __PRETTY_FUNCTION__ << ':' << msg << '\n';
  24.     }
  25. };
  26.  
  27. void Vfunction (void) { std::cout << __PRETTY_FUNCTION__ << '\n'; }
  28.  
  29. int main() {
  30.     Foo &f = Foo::getInstance();
  31.     f.DoJob(Vvoid());
  32.     f.DoJob(Vstring(), "msg");
  33.     f.DoJob(Vfunction);
  34.     return 0;
  35. }
Success #stdin #stdout 0s 3428KB
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stdin
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Standard input is empty
stdout
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void Vvoid::operator()()
void Vstring::operator()(std::string):msg
void Vfunction()
https://ideone.com/hSi2Ub
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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