Demonstrating STL vector constructors with a user-defined type

   
 

#include <iostream>
#include <cassert>
#include <vector>
using namespace std;

class MyClass {
public:
  unsigned long id;
  MyClass() : id(0) { }
  MyClass(unsigned long x) : id(x) { }


};
bool operator==(const MyClass& x, const MyClass& y) {
  return x.id == y.id;
}

bool operator!=(const MyClass& x, const MyClass& y)
{
  return x.id != y.id;
}


int main()
{
  vector<MyClass> vector1, vector2(3);
  assert (vector1.size() == 0);
  assert (vector2.size() == 3);
  assert (vector2[0] == MyClass() && vector2[1] == MyClass() &&vector2[2] == MyClass());
  assert (vector2 == vector<MyClass>(3, MyClass()));
  return 0;
}

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Demonstrating STL vector constructors with a user-defined type : vector « Vector « C++

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