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_));
(none).
The number of elements. The returned value is calculated as if by expression.
(ranges::size(base_) / stride_) + ((ranges::size(base_) % stride_ ? 1 : 0).
A link to test: Compiler Explorer.
#include <ranges>
#include <forward_list>
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
}|
(C++20) | returns an integer equal to the size of a range (customization point object) |
|
(C++20) | returns a signed integer equal to the size of a range (customization point object) |
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https://en.cppreference.com/w/cpp/ranges/stride_view/size