stl vector 函数

C ++ vector :: crend()函数 (C++ vector::crend() function)

vector::crend() is a library function of "vector" header, it is used to get the first element of a vector from reverse ending, it returns a const reverse iterator pointing to the element preceding the first element (i.e. reverse ending) of a vector.

vector :: crend()是“ vector”头文件的库函数，用于从反向结尾获取向量的第一个元素，它返回一个const反向迭代器，指向第一个元素之前的元素(即反向结尾)向量。

It returns a const_reverse_iterator which is an iterator point to the constant content(vector), the const_reverse_itertator can be increased or decreased just like an iterator but it cannot be used to update/modify the vector content it points to.

它返回const_reverse_iterator ，它是指向常量content(vector)的迭代器，可以像迭代器一样增加或减少const_reverse_itertator ，但不能用于更新/修改其指向的向量内容。

Note: To use vector, include <vector> header.

注意：要使用向量，请包含<vector>标头。

Syntax of vector::crend() function

vector :: crend()函数的语法

    vector::crend();

Parameter(s): none – It accepts nothing.

参数： 无 –不接受任何内容。

Return value: const_reverse_iterator – It returns a const reverse iterator pointing to the element preceding the first elements of the vector.

返回值： const_reverse_iterator –它返回一个const反向迭代器，指向向量的第一个元素之前的元素。

Example:

例：

    Input:
vector<int> vector1{ 1, 2, 3, 4, 5 };
Function call:
vector<int>::const_iterator crit;
crit = vector1.crend()-1;
cout<
C++ program to demonstrate example of vector::crend() function
Output
first element is: 10

Reference: C++ vector::crend()



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stl vector 函数