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  1. #include <functional>
  2. #include <iostream>
  3. #include <vector>
  4.  
  5. template <typename LambdaT, typename R, typename... Args>
  6. auto _LambdaToStdFunction(LambdaT lambda, R (LambdaT::*)(Args...) const) {
  7.   return std::function<R(Args...)>(lambda);
  8. }
  9. template <typename LambdaT>
  10. auto LambdaToStdFunction(LambdaT &&lambda) {
  11.   return _LambdaToStdFunction(std::forward<LambdaT>(lambda),
  12.                               &LambdaT::operator());
  13. }
  14.  
  15. template <typename A,typename B> 
  16. std::vector<B> map(std::function<B (A)> f, std::vector<A> arr) {
  17.   std::vector<B> res;
  18.        for (int i=0;i<arr.size();i++) res.push_back(f(arr[i]));
  19.        return res;
  20. }
  21.  
  22.  
  23. int main() {
  24.   std::vector<int> a = {1, 2, 3};
  25.   auto f = LambdaToStdFunction([](int x) -> int {
  26.     std::cout << x << std::endl;
  27.     return x;
  28.   });
  29.   map(LambdaToStdFunction([](int x) -> int {
  30. 	std::cout << x << std::endl;
  31. 	return x;}),a); //now OK
  32.   return 0;
  33. }
Success #stdin #stdout 0.01s 4784KB
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https://ideone.com/5E53Xv
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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