operator-(ranges::transform_view::sentinel)

friend constexpr ranges::range_difference_t<Base> operator-( const /iterator/<Const>& x, const /sentinel/& y ) requires std::sized_sentinel_for<ranges::sentinel_t<Base>, ranges::iterator_t<Base>>;	(1)	(C++20 起)
friend constexpr ranges::range_difference_t<Base> operator-( const /sentinel/& y, const /iterator/<Const>& x ) requires std::sized_sentinel_for<ranges::sentinel_t<Base>, ranges::iterator_t<Base>>;	(2)	(C++20 起)

计算 x 的底层迭代器与 y 的底层哨位间的距离。

这些函数对通常无限定或有限定查找不可见，而只能在 transform_view::sentinel<Const> 为参数的关联类时由实参依赖查找找到。

x	-	迭代器
y	-	哨位

令 current_ 代表底层迭代器， end_ 代表底层哨位。

1) x.current_ == y.end_

2) y.end_ == x.current_

成员函数
transform_view::transform_view
transform_view::base
transform_view::begin
transform_view::end
transform_view::size
推导指引
迭代器
transform_view::iterator::iterator
transform_view::iterator::base
transform_view::iterator::operator*
transform_view::iterator::operator[]
transform_view::iterator::operator++ transform_view::iterator::operator++(int) transform_view::iterator::operator-- transform_view::iterator::operator--(int) transform_view::iterator::operator+= transform_view::iterator::operator-=
operator==(transform_view::iterator) operator<(transform_view::iterator) operator>(transform_view::iterator) operator<=(transform_view::iterator) operator>=(transform_view::iterator) operator<=>(transform_view::iterator)
operator+(transform_view::iterator) operator-(transform_view::iterator)
iter_move(transform_view::iterator)
iter_swap(transform_view::iterator)
哨位
transform_view::sentinel::sentinel
transform_view::sentinel::base
operator==(transform_view::iterator,transform_view::sentinel)
*operator-(transform_view::iterator,transform_view::sentinel)*

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