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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 <typename InputIterator,
  15.           typename ::std::enable_if<
  16.               ::std::is_constructible<
  17.                   T,
  18.                   decltype(*::std::declval<InputIterator>())
  19.               >::value
  20.           >::type* = nullptr
  21. >
  22.   NaiveVector(InputIterator first, InputIterator last) : v(first, last) {
  23.     cout << "(InputIterator first, InputIterator last)" << endl;
  24.   }
  25.  
  26.   size_t size() const { return v.size(); }
  27. };
  28.  
  29. int main() {
  30.   vector<bool> vec({true, false, true, true});
  31.   NaiveVector<bool> myVec2(vec.cbegin(), vec.cend());
  32.   cout << "size = " << myVec2.size() << endl;
  33.   for (auto n : myVec2.v) { cout << n << " "; }
  34.   cout << endl;
  35. }
Success #stdin #stdout 0s 16064KB
comments (?)
stdin
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Standard input is empty
stdout
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(InputIterator first, InputIterator last)
size = 4
1 0 1 1
https://ideone.com/hvHnXR
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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