stl vector 函数

C ++ vector :: clear()函数 (C++ vector::clear() function)

vector::clear() is a library function of "vector" header, it is used to remove/clear all elements of the vector, it makes the 0 sized vector after removing all elements.

vector :: clear()是“ vector”头文件的库函数，用于删除/清除向量中的所有元素，删除所有元素后将其大小设为0。

Note: To use vector, include <vector> header.

注意：要使用向量，请包含<vector>标头。

Syntax of vector::clear() function

vector :: clear()函数的语法

    vector::clear();

Parameter(s): none – It accepts nothing.

参数： 无 –不接受任何内容。

Return value: void – It returns nothing.

返回值： void –不返回任何内容。

Example:

例：

    Input:
vector<int> v1{ 10, 20, 30, 40, 50 };
//clearing content of the vectors
v1.clear();
cout <> v1.size();
Output:
0

C ++程序演示vector :: clear()函数的示例 (C++ program to demonstrate example of vector::clear() function)

//C++ STL program to demonstrate example of
//vector::clear() function
#include <iostream>
#include <vector>
using namespace std;
int main()
{
//vector declaration
vector<int> v1{ 10, 20, 30, 40, 50 };
//printing elements
cout << "before clearing the elements..." << endl;
cout << "size of v1: " << v1.size() << endl;
cout << "v1: ";
for (int x : v1)
cout << x << " ";
cout << endl;
//clearing all elements
v1.clear();
//printing elements
cout << "after clearing the elements..." << endl;
cout << "size of v1: " << v1.size() << endl;
cout << "v1: ";
for (int x : v1)
cout << x << " ";
cout << endl;
return 0;
}

Output

输出量

before clearing the elements...
size of v1: 5
v1: 10 20 30 40 50
after clearing the elements...
size of v1: 0
v1:

Reference: C++ vector::clear()

参考： C ++ vector :: clear()

翻译自: https://www.includehelp.com/stl/vector-clear-function-with-example.aspx

stl vector 函数