std::ranges::zip_transform_view<F,Views...>::size

 

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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_transform_view

成員函式

zip_transform_view::zip_transform_view

zip_transform_view::begin

zip_transform_view::end

zip_transform_view::size

推導指引

迭代器 (Iterator)

成員函式

zip_transform_view::iterator::iterator

zip_transform_view::iterator::operator*

zip_transform_view::iterator::operator[]

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

非成員函式

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

operator+(zip_transform_view::iterator) operator-(zip_transform_view::iterator)

哨兵 (Sentinel)

成員函式

zip_transform_view::sentinel::sentinel

非成員函式

operator==(zip_transform_view::sentinel)

operator-(zip_transform_view::sentinel)

 

constexpr auto size()     requires ranges::sized_range</*InnerView*/>;	(1)	(C++23 起)
constexpr auto size() const     requires ranges::sized_range<const /*InnerView*/>	(2)	(C++23 起)

返回 zip_transform_view 中的元素數量。僅當每個底層（已適配）range 滿足 sized_range 時才提供此函式。

1,2) 等價於：return zip_.size();。

引數

(無)

返回值

元素的數量，它是所有適配 views 大小中的最小值。

示例

執行此程式碼

#include <algorithm>
#include <cassert>
#include <deque>
#include <forward_list>
#include <functional>
#include <iostream>
#include <ranges>
#include <vector>
 
int main()
{
    auto x = std::vector{1, 2, 3, 4, 5};
    auto y = std::deque<short>{10, 20, 30};
    auto z = std::forward_list{100., 200.};
 
    auto v1 = std::views::zip_transform(std::plus{}, x, y);
    assert(v1.size() == std::min(x.size(), y.size()));
    assert(v1.size() == 3);
    for (int i : v1)
        std::cout << i << ' ';
    std::cout << '\n';
 
    [[maybe_unused]] auto v2 = std::views::zip_transform(std::plus{}, x, z);
//  auto sz = v2.size(); // Error: z doesn't have size(), so neither does v2
    static_assert(not std::ranges::sized_range<decltype(z)>);
}

輸出

11 22 33

參閱

ranges::size (C++20)	返回等於範圍大小的整數 (定製點物件)
ranges::ssize (C++20)	返回等於範圍大小的有符號整數 (定製點物件)