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  1.     #include <iterator>
  2.     #include <type_traits>
  3.     #include <iostream>
  4.     #include <vector>
  5.     #include <list>
  6.  
  7.     template<typename T>
  8.     typename
  9.     std::enable_if<
  10.         std::is_same<
  11.             typename T::iterator_category,
  12.             std::bidirectional_iterator_tag
  13.         >::value,
  14.         T
  15.     >::type
  16.     foo(T it)
  17.     {
  18.         std::cout << "bidirectional\n";
  19.         return it;
  20.     }
  21.  
  22.     template<typename T>
  23.     typename
  24.     std::enable_if<
  25.         std::is_same<
  26.             typename T::iterator_category,
  27.             std::random_access_iterator_tag
  28.         >::value,
  29.         T
  30.     >::type
  31.     foo(T it)
  32.     {
  33.         std::cout << "random access\n";
  34.         return it;
  35.     }
  36.  
  37.     template<typename T>
  38.     T* foo(T* it)
  39.     {
  40.         std::cout << "pointer\n";
  41.         return it;
  42.     }
  43.  
  44.     int main()
  45.     {
  46.         std::list<int>::iterator it1;
  47.         std::vector<int>::iterator it2;
  48.         int* it3;
  49.         std::istream_iterator<int> it4;
  50.         foo(it1);
  51.         foo(it2);
  52.         foo(it3);
  53.         //foo(it4); // this one doesn't compile
  54.     }
  55.  
  56.  
Success #stdin #stdout 0s 2928KB
comments (?)
stdin
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Standard input is empty
stdout
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bidirectional
random access
pointer
https://ideone.com/ffTBQR
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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