Ranges library
Range access
Range conversions

Range primitives

Dangling iterator handling
Range concepts

Range factories
Range adaptors
Range generators
Range adaptor objects
Range adaptor closure objects
Helper items
(until C++23)(C++23)

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. 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);


[edit] Parameters


[edit] Return value

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

[edit] 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);

[edit] See also

returns an integer equal to the size of a range
(customization point object)[edit]
returns a signed integer equal to the size of a range
(customization point object)[edit]