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.

[edit] Data members

[edit] Member functions

[edit] Deduction guides

(none)

[edit] Nested classes

[edit] Helper templates

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

[edit] Notes

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

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

• Both create "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:

[edit] 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]

[edit] Defect reports

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

[edit] References

[edit] See also