Difference between revisions of "cpp/container/span/size"
From cppreference.com
m (langlinks) |
m (→Notes: + feature test macro (originally, the return type was signed, and all that.) |
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===Return value=== | ===Return value=== | ||
The number of elements in the span. | The number of elements in the span. | ||
| + | |||
| + | ===Note=== | ||
| + | {{feature test macro|__cpp_lib_ssize}} | ||
===Example=== | ===Example=== | ||
Revision as of 11:13, 1 February 2022
| constexpr size_type size() const noexcept; |
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Returns the number of elements in the span.
Contents |
Parameters
(none)
Return value
The number of elements in the span.
Note
| Feature-test macro | Value | Std | Feature |
|---|---|---|---|
__cpp_lib_ssize |
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) |
