NAME¶

std::ranges::stride_view::size - std::ranges::stride_view::size

Synopsis¶

constexpr auto size() requires ranges::sized_range<V>; (since C++23)
constexpr auto size() const requires ranges::sized_range<const V>; (since C++23)

Returns the number of elements.

Let base_ be the underlying view and stride_ be the stored stride value. Equivalent
to:

return __to_unsigned_like(__div_ceil(ranges::distance(base_), stride_));

Parameters¶

(none)

Return value¶

The number of elements. The returned value is calculated as if by expression

(ranges::size(base_) / stride_) + ((ranges::size(base_) % stride_ ? 1 : 0).

Example¶

// Run this code

#include <forward_list>
#include <ranges>

int main()
{
namespace vs = std::views;
constexpr static auto v = {1, 2, 3, 4, 5};
static_assert
(
vs::stride(v, 1).size() == 5 and
vs::stride(v, 2).size() == 3 and
vs::stride(v, 3).size() == 2 and
vs::stride(v, 4).size() == 2 and
vs::stride(v, 5).size() == 1 and
vs::stride(v, 6).size() == 1
);

std::forward_list list{v};
// auto s = vs::stride(list, 2).size(); // Error: not a sized_range
}

See also¶

ranges::size returns an integer equal to the size of a range
(C++20) (customization point object)
ranges::ssize returns a signed integer equal to the size of a range
(C++20) (customization point object)