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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. template<typename Iterator, typename Fn1, typename Fn2>
  5. void for_the_device(Iterator from, Iterator to, Fn1 always, Fn2 butFirst) {
  6.   switch ((from == to) ? 1 : 2) {
  7.   	case 0:
  8.   	  do {
  9.   	  	butFirst(*from);
  10.   	case 2:
  11.   	    always(*from); ++from;
  12.   	  } while (from != to);
  13.   	default: // reached directly when from == to
  14.   	  break;
  15.   }
  16. }
  17.  
  18. int main() {
  19.   int const items[] = {21, 42, 63};
  20.   int const * const end = items + sizeof(items) / sizeof(items[0]);
  21.   for_the_device(items, end,
  22.     [](auto const & i) { cout << i;},
  23.     [](auto const & i) { cout << ", ";});
  24.   cout << endl << "I'm (still) so sorry" << endl;
  25.   // Now on an empty range
  26.   for_the_device(end, end,
  27.     [](auto const & i) { cout << i;},
  28.     [](auto const & i) { cout << ", ";});
  29.   cout << "Incredibly sorry." << endl;
  30.   return 0;
  31. }
Success #stdin #stdout 0s 3460KB
comments (?)
stdin
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Standard input is empty
stdout
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21, 42, 63
I'm (still) so sorry
Incredibly sorry.
https://ideone.com/ihions
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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