operator-(ranges::zip_view::sentinel)

 

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技術規範

符號索引

外部庫

 

範圍庫 (Ranges library)

範圍訪問 begin cbegin   end cend rbegin crbegin   rend crend size ssize   data cdata reserve_hint (C++26)   empty

範圍轉換 (Range conversions) std::from_range_t std::from_range (C++23)(C++23)     to (C++23)

懸空迭代器處理 (Dangling iterator handling) dangling borrowed_iterator_t borrowed_subrange_t

範圍原語 (Range primitives)
range_size_trange_difference_trange_value_t elements_of (C++23)	iterator_tconst_iterator_tsentinel_tconst_sentinel_t (C++23)(C++23)	range_reference_trange_const_reference_trange_rvalue_reference_trange_common_reference_t (C++23)

範圍概念 (Range concepts)
range borrowed_range    common_range	sized_range viewable_range    view	input_range output_range forward_range	bidirectional_range    random_access_range contiguous_range	approximately_sized_range (C++26) constant_range (C++23)

檢視
view_interface	subrange

範圍工廠 (Range factories)
empty_viewviews::empty	single_viewviews::single	basic_istream_viewviews::istream	iota_viewviews::iota	repeat_viewviews::repeat (C++23)(C++23)

範圍介面卡 (Range adaptors)
views::all_tviews::all as_rvalue_viewviews::as_rvalue (C++23)(C++23)   filter_viewviews::filter transform_viewviews::transform take_viewviews::take take_while_viewviews::take_while common_viewviews::common views::counted to_input_viewviews::to_input (C++26)(C++26)	ref_view drop_viewviews::drop drop_while_viewviews::drop_while lazy_split_viewviews::lazy_split split_viewviews::split join_viewviews::join join_with_viewviews::join_with (C++23)(C++23)   concat_viewviews::concat (C++26)(C++26) cache_latest_viewviews::cache_latest (C++26)(C++26)	owning_view reverse_viewviews::reverse as_const_viewviews::as_const (C++23)(C++23) elements_viewviews::elements keys_viewviews::keys values_viewviews::values enumerate_viewviews::enumerate (C++23)(C++23) zip_viewviews::zip (C++23)(C++23) zip_transform_viewviews::zip_transform (C++23)(C++23)	adjacent_viewviews::adjacent (C++23)(C++23) views::pairwise (C++23) adjacent_transform_viewviews::adjacent_transform (C++23)(C++23) views::pairwise_transform (C++23) chunk_viewviews::chunk (C++23)(C++23) slide_viewviews::slide (C++23)(C++23) chunk_by_viewviews::chunk_by (C++23)(C++23) stride_viewviews::stride (C++23)(C++23) cartesian_product_viewviews::cartesian_product (C++23)(C++23)

範圍生成器 (Range generators) std::generator (C++23)

範圍介面卡閉包物件 (Range adaptor closure objects) range_adaptor_closure (C++23)

範圍介面卡物件 (Range adaptor objects)

輔助項 (Helper items)
copyable-box movable-box (直到 C++23)  (C++23)	simple-view non-propagating-cache

 

std::ranges::zip_view

成員函式

zip_view::zip_view

zip_view::begin

zip_view::end

zip_view::size

推導指引

迭代器 (Iterator)

成員函式

zip_view::iterator::iterator

zip_view::iterator::operator*

zip_view::iterator::operator[]

zip_view::iterator::operator++ zip_view::iterator::operator++(int) zip_view::iterator::operator-- zip_view::iterator::operator--(int) zip_view::iterator::operator+= zip_view::iterator::operator-=

非成員函式

operator==(zip_view::iterator) operator<(zip_view::iterator) operator>(zip_view::iterator) operator<=(zip_view::iterator) operator>=(zip_view::iterator) operator<=>(zip_view::iterator)

operator+(zip_view::iterator) operator-(zip_view::iterator)

iter_move(zip_view::iterator)

iter_swap(zip_view::iterator)

哨兵 (Sentinel)

成員函式

zip_view::sentinel::sentinel

非成員函式

operator==(zip_view::iterator,zip_view::sentinel)

operator-(zip_view::iterator,zip_view::sentinel)

 

template< bool OtherConst >     requires (std::sized_sentinel_for<                 ranges::sentinel_t</*maybe-const*/<Const, Views>>,                 ranges::iterator_t</*maybe-const*/<OtherConst, Views>>> && ...) friend constexpr     std::common_type_t<ranges::range_difference_t</*maybe-const*/<OtherConst, Views>>...> operator-( const iterator<OtherConst>& x, const sentinel& y );	(1)	(C++23 起)
template< bool OtherConst >     requires (std::sized_sentinel_for<                 ranges::sentinel_t</*maybe-const*/<Const, Views>>,                 ranges::iterator_t</*maybe-const*/<OtherConst, Views>>> && ...) friend constexpr     std::common_type_t<ranges::range_difference_t</*maybe-const*/<OtherConst, Views>>...> operator-( const sentinel& y, const iterator<OtherConst>& x );	(2)	(C++23 起)

計算 `x` 的底層迭代器元組與 `y` 的底層哨兵元組之間的最小距離。

這些函式對於普通的非限定查詢或限定查詢不可見，只能在 `zip_view::sentinel<Const>` 是引數的關聯類時透過實參依賴查詢找到。

引數

x	-	一個迭代器
y	-	一個哨兵

返回值

設 `current_` 表示 `x` 的底層迭代器元組，`end_` 表示 `y` 的底層哨兵元組。

設 `DIST(x, y, i)` 為由表示式 std::get<i>(x.current_) - std::get<i>(y.end_) 計算的距離，其中 `i` 為某個整數。

1) 在範圍 `0 ≤ i < sizeof...(Views)` 中所有 `i` 的 `DIST(x, y, i)` 中的絕對值最小的值。

2) -(x - y)。

示例

執行此程式碼

#include <cassert>
#include <deque>
#include <list>
#include <ranges>
#include <vector>
 
int main()
{
    auto x = std::vector{1, 2, 3, 4};
    auto y = std::deque{'a', 'b', 'c'};
    auto z = {1.1, 2.2};
    auto w = std::list{1, 2, 3};
 
    auto p = std::views::zip(x, y, z);
    assert(p.begin() - p.end() == +2);
    assert(p.end() - p.begin() == -2);
 
    [[maybe_unused]]
    auto q = std::views::zip(x, y, w);
 
    // The following code fires a compile-time error because std::list::iterator
    // does not support operator- that is needed to calculate the distance:
    // auto e = q.begin() - q.end();
}