C++ STL 之 vector

最新推荐文章于 2024-10-15 20:48:10 发布

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#C++ #STL #vector

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本文通过一个C++程序示例介绍了vector容器的基本使用方法，包括插入(insert)、删除(pop_back和erase)等操作，并展示了如何遍历vector容器。

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vector 容器，能够像容器一样存放各种类型的对象，简单地说，vector是一个能够存放任意类型的动态数组

#include <vector>
#include <iostream.h>

using namespace std;
using std::vector;

typedef vector<int> VectorInt;
typedef vector<int>::iterator VectorIntIter;

VectorInt g_VecIntV;

int main ()
{
    int i = 0;
    VectorIntIter iter;

    cout << "vector insert" <<endl;
    for (i = 0; i < 10; i++)
    {
        iter = g_VecIntV.begin();
        g_VecIntV.insert(iter+i, i);
    }

    for (iter = g_VecIntV.begin(); iter != g_VecIntV.end(); iter++)
    {
        int val = *iter;
        cout << val << ", ";
    }
    cout << endl;

    cout << "vector pop_back" << endl;
    g_VecIntV.pop_back();
    for (iter = g_VecIntV.begin(); iter != g_VecIntV.end(); iter++)
    {
        int val = *iter;
        cout << val << ", ";
    }
    cout << endl;

    cout << "vector erase" << endl;
    cout << "erase the 6th element" << endl;
    g_VecIntV.erase(g_VecIntV.begin() + 5);
    for (iter = g_VecIntV.begin(); iter != g_VecIntV.end(); iter++)
    {
        int val = *iter;
        cout << val << ", ";
    }
    cout << endl;
}

运行结果：

vector insert
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
vector pop_back
0, 1, 2, 3, 4, 5, 6, 7, 8,
vector erase
erase the 6th element
0, 1, 2, 3, 4, 6, 7, 8,



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