shrink_to_fit() demo

#include <iostream>#include <vector>using namespace std;int main(){    vector<string> svec;    string word;    while (cin >> word) {        svec.push_back(word);    }    cout << "size == " << svec.size() << endl         << "capacity == " << svec.capacity() << endl;    svec.shrink_to_fit();    cout << "size == " << svec.size() << endl         << "capacity == " << svec.capacity() << endl;    return 0;}