std::ranges::adjacent_view<V,N>:: size

Returns the number of elements.

Let base_ be the underlying view. Equivalent to:

using SizeType = decltype(ranges::size(base_));
using CommonType = ranges::common_type_t<SizeType, std::size_t>;
auto size = static_cast<CommonType>(ranges::size(base_));
size -= std::min<CommonType>(size, N - 1);
return static_cast<SizeType>(size);

Parameters

(none)

Return value

The number of elements, may be ​ 0 ​ if ranges:: size ( base_ ) is less than N .

Example

#include <ranges>
 
int main()
{
    constexpr static auto v = {1, 2, 3, 4, 5, 6};
 
    constexpr int width1 {4};
    constexpr auto view1 {std::views::adjacent<width1>(v)};
    static_assert(view1.size() == 3);
    static_assert(view1.size() == (v.size() - width1 + 1));
 
    constexpr int width2 {8};
    constexpr auto view2 {std::views::adjacent<width2>(v)};
    // window is too wide, so view2 has no elements:
    static_assert(view2.size() == 0);
}

See also