📜  C++中的std :: advance

📅  最后修改于: 2021-05-30 11:56:00             🧑  作者: Mango

std :: advance将迭代器“ it”前进n个元素位置。

句法 :

template 
    void advance (InputIterator& it, Distance n);

it : Iterator to be advanced
n : Number of element positions to advance.
This shall only be negative for random-access and bidirectional iterators.

Return type :
None.

动机问题:给出了一个向量容器。任务是打印备用元素。

例子 :

Input : 10 40 20 50 80 70
Output : 10 20 80
// C++ program to illustrate
// using std::advance
#include 
  
// Driver code
int main()
{
    // Vector container
    std::vector vec;
  
    // Initialising vector
    for (int i = 0; i < 10; i++)
        vec.push_back(i * 10);
  
    // Printing the vector elements
    for (int i = 0; i < 10; i++) {
        std::cout << vec[i] << " ";
    }
  
    std::cout << std::endl;
  
    // Declaring the vector iterator
    std::vector::iterator it = vec.begin();
  
    // Printing alternate elements
    while (it < vec.end()) {
        std::cout << *it << " ";
        std::advance(it, 2);
    }
}

输出:

0 10 20 30 40 50 60 70 80 90 
0 20 40 60 80
要从最佳影片策划和实践问题去学习,检查了C++基础课程为基础,以先进的C++和C++ STL课程基础加上STL。要完成从学习语言到DS Algo等的更多准备工作,请参阅“完整面试准备课程”