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  1. #include <vector>
  2. #include <algorithm>
  3. #include <iterator>
  4.  
  5. int main()
  6. {
  7.   // Begin and end iterators in STL:
  8.   {
  9.     std::vector<int> v1(4,5);
  10.     auto i  = std::find(v1.begin(), v1.end(), 3);  // i is vector::iterator
  11.  
  12.     const std::vector<int> v2(4,5);
  13.     auto j = std::find(v2.begin(), v2.end(), 3);   // j is vector::const_iterator
  14.  
  15.     std::vector<int> v3(4,5);
  16.     auto k = std::find(v3.cbegin(), v3.cend(), 3); // k is vector::const_iterator (since C++11)
  17.   }
  18.  
  19.   // Issue in C++98:
  20.   {
  21.     std::vector<int> v(3,5);
  22.     std::vector<int>::const_iterator ci = std::find( v.begin(), v.end(), 3);  // implicit casting
  23.     v.insert(ci, 2);  // syntax error in C++98, not in C++11 (since g++ 4.9.2)
  24.   }
  25.  
  26.   // C++11: use global begin() and end() for greater generality
  27.   {
  28.     std::vector<int> v1(4,5);
  29. 	auto i = std::find(begin(v1), end(v1), 3);         // i is vector::iterator
  30.  
  31. 	const std::vector<int> v2(4,5);
  32. 	auto j = std::find(begin(v2), end(v2), 3);         // j is vector::const_iterator
  33.  
  34. 	std::vector<int> v3(4,5);
  35. 	auto k = std::find(cbegin(v3), cend(v3), 3);       // not in C++11, only since C++14
  36.  
  37. 	int t[4] = { 1, 2, 3, 4 };
  38. 	auto l = std::find(std::begin(t), std::end(t), 3); // l is int*
  39.   }
  40. }
Success #stdin #stdout 0s 3412KB
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https://ideone.com/Il7UjI
Advanced CPP: Constants
Begin and end iterators in STL
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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