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.
Contents |
[edit] Parameters
(none)
[edit] Return value
The number of elements in the span.
[edit] Note
| Feature-test macro | Value | Std | Feature |
|---|---|---|---|
__cpp_lib_ssize |
201902L | (C++20) | std::ssize and unsigned std::span::size
|
[edit] Example
Run this code
#include <iostream> #include <span> void show_sizes(std::span<const int> span) { std::cout << span .size() << ' ' // 8 << span.first(7) .size() << ' ' // 7 << span.first<6>() .size() << ' ' // 6 << span.last(5) .size() << ' ' // 5 << span.last<4>() .size() << ' ' // 4 << span.subspan(2, 3) .size() << ' ' // 3 << span.subspan<3, 2>() .size() << ' ' // 2 << '\n'; } int main() { int antique_array[]{1, 2, 3, 4, 5, 6, 7, 8}; show_sizes(antique_array); }
Output:
8 7 6 5 4 3 2
[edit] See also
constructs a span (public member function) | |
| returns the size of the sequence in bytes (public member function) |
