stl中copy()函數(shù)

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

rotate_copy() function is a library function of algorithm header, it is used to rotate left the elements of a sequence within a given range and copy the rotating elements to another sequence, it accepts the range (start, end) of the input sequence, a middle point, and an iterator pointing to start element of result sequence. It rotates the elements in such a way that the element pointed by the middle iterator becomes the new first element.

rotation_copy()函數(shù)是算法標(biāo)頭的庫(kù)函數(shù)，用于在給定范圍內(nèi)向左旋轉(zhuǎn)序列的元素，并將旋轉(zhuǎn)的元素復(fù)制到另一個(gè)序列，它接受輸入序列的范圍(開(kāi)始，結(jié)束)，一個(gè)中間點(diǎn)，以及一個(gè)指向結(jié)果序列開(kāi)始元素的迭代器。 它以使中間迭代器指向的元素成為新的第一個(gè)元素的方式旋轉(zhuǎn)元素。

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

注意：要使用rotate_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::rotate_copy() function

std :: rotate_copy()函數(shù)的語(yǔ)法

std::rotate_copy(iterator start, iterator middle, iterator end, iterator start_result);

Parameter(s):

參數(shù)：

• iterator start – an iterator pointing to the first element of the sequence.

  迭代器開(kāi)始 –指向序列第一個(gè)元素的迭代器。

• iterator middle – an iterator pointing to the middle or any other elements from where we want to start the rotation.

  中間迭代器 –指向中間或我們要開(kāi)始旋轉(zhuǎn)的位置的任何其他元素的迭代器。

• iterator end – an iterator pointing to the last element of the sequence.

  迭代器末端 –指向序列的最后一個(gè)元素的迭代器。

• iterator start_result – an iterator pointing to the first element in result sequence.

  iterator start_result –指向結(jié)果序列中第一個(gè)元素的迭代器。

Return value: void – it returns noting.

返回值： void –返回注釋。

Example:

例：

Input://an array (source)int arr[] = { 10, 20, 30, 40, 50 };//vectorvector<int> v(5);//rotating and copy array elements to the vectorrotate_copy(arr + 0, arr + 2, arr + 5, v.begin());Output:vector elements: 30 40 50 10 20

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

In this program, we have an array and a vector; we are rotating its elements from 2nd index and copying into the vector.

在這個(gè)程序中，我們有一個(gè)數(shù)組和一個(gè)向量。 我們將其元素從第二索引旋轉(zhuǎn)并復(fù)制到向量中。

//C++ STL program to demonstrate use of //std::rotate_copy() function #include <iostream> #include <algorithm> #include <vector> using namespace std;//main code int main() {//an array (source)int arr[] = { 10, 20, 30, 40, 50 };//vectorvector<int> v(5);//printing array and vector elementscout << "array elements..." << endl;for (int x : arr)cout << x << " ";cout << endl;cout << "vector elements begfore rotating..." << endl;for (int x : v)cout << x << " ";cout << endl;//rotating and copy array elements to the vectorrotate_copy(arr + 0, arr + 2, arr + 5, v.begin());cout << "vector elements after rotating..." << endl;for (int x : v)cout << x << " ";cout << endl;return 0; }

Output

輸出量

array elements... 10 20 30 40 50 vector elements begfore rotating... 0 0 0 0 0 vector elements after rotating... 30 40 50 10 20

Reference: C++ std::rotate_copy()

參考： C ++ std :: rotate_copy()

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

stl中copy()函數(shù)

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