笔试题 -- vector内存空间释放及vector数据清空

笔试题 -- vector内存空间释放及vector数据清空

#include #include #include #include using namespace std;int main(){ vector vecStr; cout << "vecStr.size() = " << vecStr.size() << endl; cout << "vecStr.capacity() = " << vecStr.capacity() << endl; cout << "---------------\n"; vecStr.push_back("a"); cout << "vecStr.size() = " << vecStr.size() << endl; cout << "vecStr.capacity() = " << vecStr.capacity() << endl; cout << "---------------\n"; //当vector空间用完，再插入值时，vector内存空间会以1.5或2倍增长 vecStr.push_back("b"); vecStr.push_back("c"); cout << "vecStr.size() = " << vecStr.size() << endl; cout << "vecStr.capacity() = " << vecStr.capacity() << endl; cout << "---------------\n"; //只清空vector,未释放vector内存 vecStr.clear(); cout << "vecStr.size() = " << vecStr.size() << endl; cout << "vecStr.capacity() = " << vecStr.capacity() << endl; cout << "---------------\n"; //释放vector内存 vector().swap(vecStr); cout << "vecStr.size() = " << vecStr.size() << endl; cout << "vecStr.capacity() = " << vecStr.capacity() << endl; cout << "---------------\n"; return 0;}

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