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std::counted_iterator<I>:: operator=

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C++
Iterator library
Iterator concepts
Iterator primitives
Algorithm concepts and utilities
Indirect callable concepts
Common algorithm requirements
(C++20)
(C++20)
(C++20)
Utilities
(C++20)
Iterator adaptors
Range access
(C++11) (C++14)
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(C++11) (C++14)
(C++14) (C++14)
(C++17) (C++20)
(C++17)
(C++17)
std::counted_iterator
template < class I2 >

requires std:: assignable_from < I & , const I2 & >

constexpr counted_iterator & operator = ( const counted_iterator < I2 > & other ) ;
(C++20 起)

底层迭代器和 length 被赋值为 other 的对应值。

目录

参数

其他 - 用于从...赋值的迭代器适配器

返回值

* this

示例

运行此代码 
#include <algorithm>
#include <cassert>
#include <initializer_list>
#include <iterator>
int main()
{
    auto a = {3, 1, 4, 1, 5, 9, 2};
    std::counted_iterator<std::initializer_list<int>::iterator> p(begin(a), size(a) - 2);
    std::counted_iterator<std::initializer_list<int>::iterator> q;
    assert(q.count() == 0);
    assert(q.count() != p.count());
    q = p;
    assert(q.count() == p.count());
    assert(std::ranges::equal(p, std::default_sentinel, q, std::default_sentinel));
}

参见

构造新的 counted_iterator
(公开成员函数)