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  1. #include <iostream>
  2. #include <vector>
  3. #include <type_traits>
  4.  
  5. using namespace std;
  6.  
  7. template <typename T>
  8. struct NaiveVector {
  9.   vector<T> v;
  10.   NaiveVector(size_t num, const T &val) : v(num, val) {
  11.     cout << "(int num, const T &val)" << endl;
  12.   }
  13.  
  14.   template
  15.   <
  16.     typename InputIterator
  17.   , typename = typename ::std::enable_if
  18.     <
  19.       ::std::is_same
  20.       <
  21.         T &
  22.       , typename ::std::remove_const
  23.         <
  24.           decltype(*(::std::declval< InputIterator >()))
  25.         >::type
  26.       >::value
  27.     ,  void
  28.     >::type
  29.   >
  30.   NaiveVector(InputIterator first, InputIterator last) : v(first, last) {
  31.     cout << "(InputIterator first, InputIterator last)" << endl;
  32.   }
  33.  
  34.   size_t size() const { return v.size(); }
  35. };
  36.  
  37. int main() {
  38.   NaiveVector<int> myVec1(5,1);
  39.   cout << "size = " << myVec1.size() << endl;
  40.   for (auto n : myVec1.v) { cout << n << " "; }
  41.   cout << endl;
  42.  
  43.   cout << "-----" << endl;
  44.  
  45.   vector<int> vec({1,2,3,4,5});
  46.   NaiveVector<int> myVec2(vec.begin(), vec.end());
  47.   cout << "size = " << myVec2.size() << endl;
  48.   for (auto n : myVec2.v) { cout << n << " "; }
  49.   cout << endl;
  50. }
Success #stdin #stdout 0s 16064KB
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stdin
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Standard input is empty
stdout
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(int num, const T &val)
size = 5
1 1 1 1 1 
-----
(InputIterator first, InputIterator last)
size = 5
1 2 3 4 5
https://ideone.com/rf9qXv
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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