On Tue, 2014-06-10 at 08:07 +0200, Francis ANDRE wrote:
> I do not understand the output of this small program usinf the <vector>
> container.
>
> #include <iostream>
> #include <vector>
> using namespace std;
>
> int main() {
> cout << "!!!Hello World!!!" << endl;
> int i = 1;
> int j = 2;
> int k = 3;
> vector<int*> v(5);
> v.push_back(&i);
> v.push_back(&j);
> v.push_back(&k);
>
> for( auto &n : v) {
> cout << "int* =" << n;
> if (n != 0)
> cout << ", int=" << *n;
> cout << endl;
> }
> return 0;
> }
>
> !!!Hello World!!!
> int* =0
> int* =0
> int* =0
> int* =0
> int* =0
> int* =0x22aa60, int=1
> int* =0x22aa5c, int=2
> int* =0x22aa58, int=3
>
>
> Is this could be a bug?
The output looks right to me. You've initialized the vector with 5
elements which will use the default initializer for the value (0 in this
case). And then you've pushed (appended) 3 more values to the vector.
So before the loop, the vector has 8 elements: 5 zeros, and then the
addresses for the variables i, j, and k respectively.
Best regards,
Nick
