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std::ranges:: bidirectional_range

From cppreference.net
C++
Ranges library
Range adaptors
定义于头文件 <ranges>
template < class T >

concept bidirectional_range =

ranges:: forward_range < T > && std:: bidirectional_iterator < ranges:: iterator_t < T >> ;
(C++20 起)

bidirectional_range 概念是对 range 的细化，要求 ranges::begin 返回的迭代器满足 bidirectional_iterator 模型。

示例

运行此代码 
#include <forward_list>
#include <list>
#include <ranges>
#include <set>
#include <unordered_set>
int main()
{
    static_assert(
            std::ranges::bidirectional_range<std::set<int>> and
        not std::ranges::bidirectional_range<std::unordered_set<int>> and
            std::ranges::bidirectional_range<std::list<int>> and
        not std::ranges::bidirectional_range<std::forward_list<int>>
    );
}

参见

(C++20)
指定其迭代器类型满足 forward_iterator 的范围
(概念)
(C++20)
指定其迭代器类型满足 random_access_iterator 的范围
(概念)