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  1. #include <iostream>
  2. #include <functional>
  3.  
  4. struct execute {
  5.     const unsigned long long n;
  6.  
  7. 	template<typename F, class Check = decltype((*(F*)nullptr)())>
  8.     void operator() (F what, ...) {
  9.         for (auto i = 0; i < n; i++)
  10.             what();
  11.     }
  12.  
  13. 	template<typename F, class Check = decltype((*(F*)nullptr)(0))>
  14.     void operator() (F what) {
  15.         for (auto i = 0; i < n; i++)
  16.             what(i);
  17.     }
  18. };
  19.  
  20. execute operator"" _times(unsigned long long n) {
  21.     return execute{n};
  22. }
  23.  
  24. int main() {
  25.     3_times([]{
  26.         std::cout << "bla" << std::endl;
  27.     });
  28.  
  29.     auto twice = 2_times;
  30.  
  31.     twice([]{
  32.         std::cout << "blup" << std::endl;
  33.     });
  34.  
  35.     3_times([](unsigned long long i) {
  36.         std::cout << "counting: " << i << std::endl;
  37.     });
  38. }
  39.  
Success #stdin #stdout 0s 3468KB
comments (?)
stdin
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Standard input is empty
stdout
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bla
bla
bla
blup
blup
counting: 0
counting: 1
counting: 2
https://ideone.com/uYtqLv
cpp 14 42.times with counter - no std::function overhead
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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