std::ranges:: views:: adjacent, std::ranges:: adjacent_view, std::ranges:: views:: pairwise

adjacent_view always models forward_range , and models bidirectional_range , random_access_range , or sized_range if adapted view type models the corresponding concept.

Data members

Member functions

Deduction guides

(none)

Nested classes

Helper templates

This specialization of ranges::enable_borrowed_range makes adjacent_view satisfy borrowed_range when the underlying view satisfies it.

Notes

views :: adjacent only accepts foward ranges even when N is 0 .

There are similarities between ranges::adjacent_view and ranges::slide_view :

• Both create a "sliding window" of size N .
• Both have the same size S - N + 1 , where S is the size of an adapted view such that S >= N > 0 .

The following table shows the differences between these adaptors:

Example

#include <array>
#include <format>
#include <iostream>
#include <ranges>
#include <tuple>
 
int main()
{
    constexpr std::array v{1, 2, 3, 4, 5, 6};
    std::cout << "v = [1 2 3 4 5 6]\n";
 
    for (int i{}; std::tuple t : v | std::views::adjacent<3>)
    {
        auto [t0, t1, t2] = t;
        std::cout << std::format("e = {:<{}}[{} {} {}]\n", "", 2 * i++, t0, t1, t2);
    }
}

v = [1 2 3 4 5 6]
e = [1 2 3]
e =   [2 3 4]
e =     [3 4 5]
e =       [4 5 6]

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

References

See also