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  1. #include <iostream>
  2.  
  3. auto wrap(int (*f)(int)){
  4.     return [f](int i) {
  5.         return f(i);
  6.     };
  7. }
  8.  
  9. int foo(int i);
  10. extern decltype(wrap(&foo)) wrapped_foo;
  11.  
  12. #if 1
  13. int foo(int i) { return i;}
  14. decltype(wrap(foo)) wrapped_foo = wrap(&foo);
  15. #endif
  16.  
  17. int func(){
  18.     return wrapped_foo(42);
  19. }
  20.  
  21.  
  22. int main() {
  23. 	std::cout << func() << std::endl;
  24. }
Success #stdin #stdout 0s 4268KB
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stdin
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Standard input is empty
stdout
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42
https://ideone.com/EwGkoN
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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