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  1. #include <iostream>
  2. #include <utility>
  3.  
  4. struct S { int i; bool b; char c; };
  5.  
  6. // Type-dependent processors.
  7. void func(const    int&) { std::cout << "func(const    int&)\n"; }
  8. void func(const   bool&) { std::cout << "func(const   bool&)\n"; }
  9. void func(const   char&) { std::cout << "func(const   char&)\n"; }
  10. void func(const double&) { std::cout << "func(const double&)\n"; }
  11. void func(const      S&) { std::cout << "func(const      S&)\n"; }
  12.  
  13. // Main function, defers to processor.
  14. template<typename T> void(*var)(const T&) = func;
  15. template<typename T> void call(T&& t) { return var<T>(std::forward<T>(t)); }
  16.  
  17. // Put it to use.
  18. int main() {
  19.     call(3);
  20.     call(S{});
  21.     call(true);
  22.     call(3.);
  23.     call('3');
  24. }
Success #stdin #stdout 0.01s 5328KB
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Standard input is empty
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func(const    int&)
func(const      S&)
func(const   bool&)
func(const double&)
func(const   char&)
https://ideone.com/4vMUaf
language:
C++14 (gcc 8.3)
created:
32 days ago
visibility:
secret

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