std::ranges::views::slide, std::ranges::slide_view

template< ranges::forward_range V >
    requires ranges::view<V>
class slide_view
    : public ranges::view_interface<slide_view<V>>

namespace views {
    inline constexpr /* unspecified */ slide = /* unspecified */;
}

template< ranges::viewable_range R >
constexpr ranges::view auto slide( R&& r, ranges::range_difference_t<R> n );

template< class DifferenceType >
constexpr /* range adaptor object */ slide( DifferenceType&& n );

template< class V >
concept __slide_caches_nothing =
    ranges::random_access_range<V> && ranges::sized_range<V>;

template< class V >
concept __slide_caches_last =
    !__slide_caches_nothing<V> &&
    ranges::bidirectional_range<V> && ranges::common_range<V>;

template< class V >
concept __slide_caches_first =
    !__slide_caches_nothing<V> && !__slide_caches_last<V>;

• s - n + 1, if s >= n,
• ​0​ otherwise, and the resulting view is empty.

If n is not greater than ​0​, the behavior is undefined.

slide_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

Nested classes

Helper templates

template< class V >
inline constexpr bool ranges::enable_borrowed_range<slide_view<V>> =
    ranges::enable_borrowed_range<V>;

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

Notes

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 differences between these adapters are:

Example

#include <algorithm>
#include <iostream>
#include <ranges>
 
auto print_subrange = [](std::ranges::viewable_range auto&& r)
{
    std::cout << '[';
    for (char space[]{0,0}; auto elem : r)
        std::cout << space << elem, *space = ' ';
    std::cout << "] ";
};
 
int main()
{
    const auto v = {1, 2, 3, 4, 5, 6};
 
    std::cout << "All sliding windows of width:\n";
    for (const unsigned width : std::views::iota(1U, 1U + v.size()))
    {
        auto const windows = v | std::views::slide(width);
        std::cout << "W = " << width << ": ";
        std::ranges::for_each(windows, print_subrange);
        std::cout << '\n';
    }
}

All sliding windows of width W:
W = 1: [1] [2] [3] [4] [5] [6] 
W = 2: [1 2] [2 3] [3 4] [4 5] [5 6] 
W = 3: [1 2 3] [2 3 4] [3 4 5] [4 5 6] 
W = 4: [1 2 3 4] [2 3 4 5] [3 4 5 6] 
W = 5: [1 2 3 4 5] [2 3 4 5 6] 
W = 6: [1 2 3 4 5 6]

References

• C++23 standard (ISO/IEC 14882:2023):
• 26.7.29 Slide view [range.slide]

See also