NAME

std::ranges::bidirectional_range - std::ranges::bidirectional_range

Synopsis

Defined in header <ranges>
template< class T >

concept bidirectional_range = (since C++20)

ranges::forward_range<T> &&
std::bidirectional_iterator<ranges::iterator_t<T>>;

The bidirectional_range concept is a refinement of range for which ranges::begin
returns a model of bidirectional_iterator.

Example

// Run this code

#include <ranges>
#include <list>
#include <forward_list>
#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>>
);
}

See also

ranges::forward_range specifies a range whose iterator type satisfies
(C++20) forward_iterator
(concept)
ranges::random_access_range specifies a range whose iterator type satisfies
(C++20) random_access_iterator
(concept)