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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)
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Utilities
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Iterator adaptors
Range access
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std::counted_iterator
constexpr decltype ( auto ) operator * ( ) ;
(1) (C++20 起)
constexpr decltype ( auto ) operator * ( ) const
requires /*dereferenceable*/ < const I > ;
(2) (C++20 起)
constexpr auto operator - > ( ) const noexcept
requires std:: contiguous_iterator < I > ;
(3) (C++20 起)
1,2) 返回当前元素的引用。若 this - > count ( ) <= 0 则行为未定义。函数体等价于 return * current ; 。
3) 返回指向当前元素的指针。函数体等价于 return std:: to_address ( current ) ; 。

目录

参数

(无)

返回值

指向当前元素的引用或指针。

示例

运行此代码 
#include <complex>
#include <iostream>
#include <iterator>
using std::operator""i;
int main()
{
    const auto il = {1.i, 2.i, 3.i, 4.i, 5.i};
    for (std::counted_iterator i{il.begin() + 1, 3}; i != std::default_sentinel; ++i)
        std::cout << *i << ' ';
    std::cout << '\n';
    for (std::counted_iterator i{il.begin() + 1, 3}; i != std::default_sentinel; ++i)
        std::cout << i->imag() << ' ';
    std::cout << '\n';
}

输出： 

(0,2) (0,3) (0,4)
2 3 4

参见

通过索引访问元素
(公开成员函数)