std::span<T,Extent>::size
From cppreference.com
constexpr size_type size() const noexcept; |
(since C++20) | |
Returns the number of elements in the span.
Return value
The number of elements in the span.
Note
| Feature-test macro | Value | Std | Feature |
|---|---|---|---|
__cpp_lib_ssize |
201902L |
(C++20) | std::ssize and unsigned std::span::size
|
Example
Run this code
#include <span>
int main()
{
constexpr static int c_array[]{1, 2, 3, 4, 5, 6, 7, 8};
constexpr std::span<const int> span{c_array};
static_assert(8 == span.size());
static_assert(7 == span.first(7).size());
static_assert(6 == span.first<6>().size());
static_assert(5 == span.last(5).size());
static_assert(4 == span.last<4>().size());
static_assert(3 == span.subspan(2, 3).size());
static_assert(2 == span.subspan<3, 2>().size());
static_assert(1 == span.subspan<7>().size());
}
See also
constructs a span (public member function) | |
| returns the size of the sequence in bytes (public member function) |