QVector::reserve() bug?

[Caius Aérobus]

What is wrong in my code?

#include <QVector>
 
int main()
{
  QVector<int> v;
  printf("v.size()=%u\n", v.size());
  v.reserve(2);	     
  printf("v.size()=%u\n", v.size());
}

#include <QVector>

int main()
{
  QVector<int> v;
  printf("v.size()=%u\n", v.size());
  v.reserve(2);	     
  printf("v.size()=%u\n", v.size());
}

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Result:

v.size()=0
v.size()=0

v.size()=0
v.size()=0

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I expected that reserve() does allocate the required memory, as resize() does, so how does reserve() work actually?