std::ranges::cartesian_product_view<First, Vs...>::cartesian_product_view

 

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功能特性测试宏 (C++20)

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符号索引

外部库

 

范围库

范围访问 begin cbegin   end cend rbegin crbegin   rend crend size ssize   data cdata reserve_hint (C++26)   empty

范围转换 std::from_range_t std::from_range (C++23)(C++23)     to (C++23)

悬垂迭代器处理 dangling borrowed_iterator_t borrowed_subrange_t

范围原语
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)

范围概念
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)

视图
view_interface	subrange

范围工厂
empty_viewviews::empty	single_viewviews::single	basic_istream_viewviews::istream	iota_viewviews::iota	repeat_viewviews::repeat (C++23)(C++23)

范围适配器
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)

范围生成器 std::generator (C++23)

范围适配器闭包对象 range_adaptor_closure (C++23)

范围适配器对象

辅助项
copyable-box movable-box (C++23 前)  (C++23)	simple-view non-propagating-cache

 

std::ranges::cartesian_product_view

成员函数

cartesian_product_view::cartesian_product_view

cartesian_product_view::begin

cartesian_product_view::end

cartesian_product_view::size

推导指引

迭代器

成员函数

cartesian_product_view::iterator::iterator

cartesian_product_view::iterator::operator*

cartesian_product_view::iterator::operator[]

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

cartesian_product_view::iterator::next

cartesian_product_view::iterator::prev

cartesian_product_view::iterator::distance_from

非成员函数

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

operator+(cartesian_product_view::iterator) operator-(cartesian_product_view::iterator)

iter_move(cartesian_product_view::iterator)

iter_swap(cartesian_product_view::iterator)

 

constexpr cartesian_product_view() = default;	(1)	(C++23 起)
constexpr explicit cartesian_product_view( First first_base, Vs... bases );	(2)	(C++23 起)

构造 cartesian_product_view。

1) 默认构造函数。直接初始化底层数据成员 base_。

2) 移动构造底层的 base_，即以 std::move(first_base), std::move(bases)... 将其初始化。

参数

first_base	-	用于适配的首个视图对象。
bases	-	用于适配的视图对象的包。

示例

运行此代码

#include <array>
#include <format>
#include <iostream>
#include <ranges>
#include <vector>

int main()
{
    auto x = std::array{'A', 'B'};
    auto y = std::vector{1, 2, 3};
    auto z = std::vector{-1, -2, -3};

    auto v = std::ranges::cartesian_product_view(x, y, z); // 重载 (2)

    for (int i{1}; auto const& [rx, ry, rz] : v)
        std::cout << std::format("({} {} {}){}", rx, ry, rz, (i++ % 3) ? ' ' : '\n');
}

输出：

(A 1 -1) (A 1 -2) (A 1 -3)
(A 2 -1) (A 2 -2) (A 2 -3)
(A 3 -1) (A 3 -2) (A 3 -3)
(B 1 -1) (B 1 -2) (B 1 -3)
(B 2 -1) (B 2 -2) (B 2 -3)
(B 3 -1) (B 3 -2) (B 3 -3)