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
    
      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 
    
     #include 
     
      using namespace std;int main(){
       //vector declaration    vector
      
        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: 5v1: 10 20 30 40 50after clearing the elements...size of v1: 0v1:

Reference:

参考：

翻译自:

stl vector 函数