vector::clear

清除向量的項目。

void clear( );

範例

// vector_clear.cpp
// compile with: /EHsc
#include <vector>
#include <iostream>
using namespace std;
int main( )
{
vector <int> vec;

    vec.push_back(10);
    vec.push_back(20);
    vec.push_back(30);

    cout << "The size of vec is " << vec.size() << endl;
    cout << "The capacity of vec is " << vec.capacity() << endl;
    vec.clear();
    cout << "The size of vec after clearing is " << vec.size() << endl;
    cout << "The capacity of vec after clearing is " << vec.capacity() << endl;}

需求

標頭：<vector>

命名空間: std

請參閱

參考

vector 類別

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