std::span<T,Extent>::size - cppreference.com (original) (raw)
| constexpr size_type size() const noexcept; | | (since C++20) | | ------------------------------------------- | | ------------- |
Returns the number of elements in the span.
[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
#include int main() { constexpr static int c_array[]{1, 2, 3, 4, 5, 6, 7, 8}; constexpr std::span 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()); }