// capacity_test.cpp: test g++'s capacity allocation strategy
#include <iostream>
#include <vector>
#include <stdexcept>
using namespace std;

int main() {
    static const size_t C = 20;
    vector<int> vec;
    cout << "Initial capa = " << vec.capacity() << endl;
    for (size_t i=0; i<C; i++) {
        vec.push_back(i);
        cout << "Capa[" << i << "] = " << vec.capacity() << " ";
    }

    vector<int> v2;

    for (size_t i=C; i>0; i--) {
        vec.pop_back();
        // vector<int>(vec).swap(vec);
        if (i==C/2) v2 = vec;
        cout << "Capa[" << i-1 << "] = " << vec.capacity() << " ";
    }
    cout << endl;
    cout << "V2's capacity = " << v2.capacity() << endl;
}