vector<string>::reserve()

reserve 실험을 string에 이어 vertor에서도 했다.

#include <string>
#include <vector>
#include <iostream>

using namespace std;

int main()
{
    vector<string> s;

    cout << "1 - s.capacity() : " << s.capacity() << endl;
    s.reserve(10);
    cout << "2 - s.capacity() : " << s.capacity() << endl;

    s.reserve(100);
    cout << "3 - s.capacity() : " << s.capacity() << endl;

    s.reserve(1000);
    cout << "4 - s.capacity() : " << s.capacity() << endl;

    s.reserve(100);
    cout << "5 - s.capacity() : " << s.capacity() << endl;

    s.reserve(10);
    cout << "6 - s.capacity() : " << s.capacity() << endl;

    s.reserve(1);
    cout << "7 - s.capacity() : " << s.capacity() << endl;

    s.reserve(0);
    cout << "8 - s.capacity() : " << s.capacity() << endl;


    return 0;
}

결과)
g++ 2.9.6
$ ./a.out
1 - s.capacity() : 0
2 - s.capacity() : 10
3 - s.capacity() : 100
4 - s.capacity() : 1000
5 - s.capacity() : 1000
6 - s.capacity() : 1000
7 - s.capacity() : 1000
8 - s.capacity() : 1000

g++ 3.2.2
$ ./a.out
1 - s.capacity() : 0
2 - s.capacity() : 10
3 - s.capacity() : 100
4 - s.capacity() : 1000
5 - s.capacity() : 1000
6 - s.capacity() : 1000
7 - s.capacity() : 1000
8 - s.capacity() : 1000

이 경우는 2.9.6, 3.2.2 모두 reserve()를 지원했다. shrink는 안됐다.