c++stl和std

C ++ STL std :: replace()函数 (C++ STL std::replace() function)

replace() function is a library function of algorithm header, it is used to replace an old value with a new value in the given range of a container, it accepts iterators pointing to the starting and ending positions, an old value to be replaced and a new value to be assigned.

replace()函数是算法标头的库函数，用于在容器的给定范围内用新值替换旧值，它接受指向开始和结束位置的迭代器，要替换的旧值以及要分配的新值。

Note: To use replace() function – include <algorithm> header or you can simple use <bits/stdc++.h> header file.

注意：要使用replace()函数 –包括<algorithm>头文件，或者您可以简单地使用<bits / stdc ++。h>头文件。

Syntax of std::replace() function

std :: replace()函数的语法

    std::replace(
iterator start, 
iterator end, 
const T& old_value, 
const T& new_value);

Parameter(s):

参数：

• iterator start, iterator end – these are the iterators pointing to the starting and ending positions in the container, where we have to run the replace operation.

  迭代器开始，迭代器结束 –这些迭代器指向容器中我们必须运行替换操作的开始和结束位置。

• old_value – is the value to be searched and replaced with the new value.

  old_value –是要搜索并替换为新值的值。

• new_value – a value to be assigned instead of an old_value.

  new_value –要分配的值，而不是old_value。

Return value: void – it returns noting.

返回值： void –返回注释。

Example:

例：

    Input:
vector<int> v{ 10, 20, 10, 20, 10, 30, 40, 50, 60, 70 };
//replacing 10 with 99
replace(v.begin(), v.end(), 10, 99);
Output:
99 20 99 20 99 30 40 50 60 70

C ++ STL程序演示了std :: replace()函数的使用 (C++ STL program to demonstrate use of std::replace() function)

In this program, we have a vector and we are assigning a new value to an old value.

在此程序中，我们有一个向量，并且正在将新值分配给旧值。

//C++ STL program to demonstrate use of
//std::replace() function
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
int main()
{
//vector
vector<int> v{ 10, 20, 10, 20, 10, 30, 40, 50, 60, 70 };
//printing vector elements
cout << "before replacing, v: ";
for (int x : v)
cout << x << " ";
cout << endl;
//replacing 10 with 99
replace(v.begin(), v.end(), 10, 99);
//printing vector elements
cout << "after replacing, v: ";
for (int x : v)
cout << x << " ";
cout << endl;
return 0;
}

Output

输出量

before replacing, v: 10 20 10 20 10 30 40 50 60 70
after replacing, v: 99 20 99 20 99 30 40 50 60 70

Reference: C++ std::replace()

参考： C ++ std :: replace()

翻译自: https://www.includehelp.com/stl/std-replace-function-with-example.aspx

c++stl和std