stl中copy()函數(shù)

C ++ STL std :: copy()函數(shù) (C++ STL std::copy() function)

copy() function is a library function of algorithm header, it is used to copy the elements of a container, it copies the elements of a container from given range to another container from a given beginning position.

copy()函數(shù)是算法標(biāo)頭的庫(kù)函數(shù)，用于復(fù)制容器的元素，它將容器的元素從給定范圍復(fù)制到給定起始位置的另一個(gè)容器。

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

注意：要使用copy()函數(shù) –包括<algorithm>頭文件，或者您可以簡(jiǎn)單地使用<bits / stdc ++。h>頭文件。

Syntax of std::copy() function

std :: copy()函數(shù)的語(yǔ)法

std::copy(iterator source_first, iterator source_end, iterator target_start);

Parameter(s):

參數(shù)：

• iterator source_first, iterator source_end – are the iterator positions of the source container.

  迭代器source_first，迭代器source_end –是源容器的迭代器位置。

• iterator target_start – is the beginning iterator of the target container.

  迭代器target_start –是目標(biāo)容器的開(kāi)始迭代器。

Return value: iterator – it is an iterator to the end of the target range where elements have been copied.

返回值： 迭代器 –它是目標(biāo)元素已復(fù)制到目標(biāo)范圍末尾的迭代器。

Example:

例：

Input://declaring & initializing an int arrayint arr[] = { 10, 20, 30, 40, 50 };//vector declarationvector<int> v1(5);//copying array elements to the vectorcopy(arr, arr + 5, v1.begin());Output://if we print the valuearr: 10 20 30 40 50v1: 10 20 30 40 50

C ++ STL程序演示了std :: copy()函數(shù)的使用 (C++ STL program to demonstrate use of std::copy() function)

In this example, we are copying the array elements to the vector.

在此示例中，我們將數(shù)組元素復(fù)制到向量。

//C++ STL program to demonstrate use of //std::copy() function #include <iostream> #include <algorithm> #include <vector> using namespace std;int main() {//declaring & initializing an int arrayint arr[] = { 10, 20, 30, 40, 50 };//vector declarationvector<int> v1(5);//copying array elements to the vectorcopy(arr, arr + 5, v1.begin());//printing arraycout << "arr: ";for (int x : arr)cout << x << " ";cout << endl;//printing vectorcout << "v1: ";for (int x : v1)cout << x << " ";cout << endl;return 0; }

Output

輸出量

arr: 10 20 30 40 50 v1: 10 20 30 40 50

Reference: C++ std::copy()

參考： C ++ std :: copy()

翻譯自: https://www.includehelp.com/stl/std-copy-function-with-example.aspx

stl中copy()函數(shù)

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