Does std::vector.pop_back() change vector's capacity?

Question

If I allocated an std::vector to a certain size and capacity using resize() and reserve() at the beginning of my program, is it possible that

Answer 1

Under C++11 one can call shrink_to_fit() to ask for a vector (as well as a deque or a string) in order to reduce the reserved space to the vector's capacity. Note however that this is implementation dependent: it's merely a request and there's no guarantee whatsoever. You can try the following code:

#include 
#include 
using namespace std;

int main(){
    vector myVector;

    for (auto i=1;i!=1e3;++i)
        myVector.push_back(i);

    cout << "Capacity: " << myVector.capacity() << endl;
    myVector.reserve(2000);
    cout << "Capacity (after reserving 2000): " << myVector.capacity() << endl;
    myVector.shrink_to_fit();
    cout << "Capacity (after shrink_to_fit): " << myVector.capacity(); 

}