NAME¶

std::ranges::forward_range - std::ranges::forward_range

Synopsis¶

Defined in header <ranges>
template< class T >

concept forward_range = (since C++20)

ranges::input_range<T> &&
std::forward_iterator<ranges::iterator_t<T>>;

The forward_range concept is a refinement of range for which ranges::begin returns a
model of forward_iterator.

Example¶

// Run this code

#include <forward_list>
#include <queue>
#include <ranges>
#include <span>
#include <stack>
#include <tuple>

const char* str{"not a forward range"};
const char str2[] = "a forward range";
static_assert(
std::ranges::forward_range<decltype("a forward range")> &&
!std::ranges::forward_range<decltype(str)> &&
std::ranges::forward_range<decltype(str2)> &&
!std::ranges::forward_range<std::stack<char>> &&
std::ranges::forward_range<std::forward_list<char>> &&
!std::ranges::forward_range<std::tuple<std::forward_list<char>>> &&
std::ranges::forward_range<std::span<char>> &&
!std::ranges::forward_range<std::queue<char>> &&
"");

int main() {}