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operator- (ranges::elements_view:: sentinel )

From cppreference.net
C++
Ranges library
Range adaptors
std::ranges::elements_view
Member functions
(C++26)
Nested classes
Iterator
Sentinel
operator- (elements_view:: iterator ,elements_view:: sentinel )
template < bool OtherConst >

requires std:: sized_sentinel_for < ranges:: sentinel_t < Base > ,
ranges:: iterator_t < /*maybe-const*/ < OtherConst, V >>>
friend constexpr ranges:: range_difference_t < /*maybe-const*/ < OtherConst, V >>

operator - ( const /*iterator*/ < OtherConst > & x, const /*sentinel*/ & y ) ;
(1) (自 C++20 起)
template < bool OtherConst >

requires std:: sized_sentinel_for < ranges:: sentinel_t < Base > ,
ranges:: iterator_t < /*maybe-const*/ < OtherConst, V >>>
friend constexpr ranges:: range_difference_t < /*maybe-const*/ < OtherConst, V >>

operator - ( const /*sentinel*/ & y, const /*iterator*/ < OtherConst > & x ) ;
(2) (自 C++20 起)

计算 x 底层迭代器与 y 底层哨位之间的距离。

这些函数模板对普通的 非限定查找 或 限定查找 不可见，仅当 elements_view:: sentinel 作为参数的关联类时，才能通过 实参依赖查找 找到它们。

参数

x - 一个 迭代器
y - 一个哨位

返回值

1) x. base ( ) - y. base ( )
2) y. base ( ) - x. base ( )