str2.cpp

来自「一本很好的C++学习的丛书！初学者必看的」· C++ 代码 · 共 23 行

// str2.cpp -- capacity() and reserve()
#include <iostream>
#include <string>
int main()
{
    using namespace std;
    string empty;
    string small = "bit";
    string larger = "Elephants are a girl's best friend";
    cout << "Sizes:\n";
    cout << "\tempty: " << empty.size() << endl;
    cout << "\tsmall: " << small.size() << endl;
    cout << "\tlarger: " << larger.size() << endl;
    cout << "Capacities:\n";
    cout << "\tempty: " << empty.capacity() << endl;
    cout << "\tsmall: " << small.capacity() << endl;
    cout << "\tlarger: " << larger.capacity() << endl;
    empty.reserve(50);
    cout << "Capacity after empty.reserve(50): " 
         << empty.capacity() << endl;
    return 0;
}