std::span<T,Extent>:: size
From cppreference.com
C++
Containers library
Sequence | ||||
(C++11)
|
||||
(C++26)
|
||||
(C++11)
|
||||
Associative | ||||
Unordered associative | ||||
(C++11)
|
||||
(C++11)
|
||||
(C++11)
|
||||
(C++11)
|
||||
Adaptors | ||||
(C++23)
|
||||
(C++23)
|
||||
(C++23)
|
||||
(C++23)
|
||||
Views | ||||
(C++20)
|
||||
(C++23)
|
||||
Tables | ||||
Iterator invalidation | ||||
Member function table | ||||
Non-member function table |
std::span
Member functions | ||||
Element access | ||||
(C++26)
|
||||
Iterators | ||||
(C++23)
|
||||
(C++23)
|
||||
(C++23)
|
||||
(C++23)
|
||||
Observers | ||||
span::size
|
||||
Subviews | ||||
Non-member functions | ||||
Non-member constant | ||||
Deduction guides |
constexpr
size_type size
(
)
const
noexcept
;
|
(since C++20) | |
Returns the number of elements in the span.
Parameters
(none)
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 <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
See also
constructs a
span
(public member function) |
|
returns the size of the sequence in bytes
(public member function) |
Retrieved from "
https://en.cppreference.com/mwiki/index.php?title=cpp/container/span/size&oldid=153253
"