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std::counted_iterator<I>:: count

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C++
Iterator library
Iterator concepts
Iterator primitives
Algorithm concepts and utilities
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(C++20)
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std::counted_iterator
constexpr std:: iter_difference_t < I > count ( ) const noexcept ;
(C++20부터)

기본 length 를 반환하며, 이는 끝까지의 거리입니다.

목차

매개변수

(없음)

반환값

기본 length .

예제

이 코드 실행 
#include <cassert>
#include <iostream>
#include <iterator>
int main()
{
    constexpr static auto il = {1, 2, 3, 4, 5};
    constexpr std::counted_iterator i1{il.begin() + 1, 3};
    static_assert(i1.count() == 3);
    auto i2{i1};
    for (; std::default_sentinel != i2; ++i2)
        std::cout << "*i2: " << *i2 << ", count(): " << i2.count() << '\n';
    assert(i2.count() == 0);
}

출력: 

*i2: 2, count(): 3
*i2: 3, count(): 2
*i2: 4, count(): 1

참고 항목

기본 반복자에 접근
(public member function)