Difference between revisions of "Template:cpp/container/size"
From cppreference.com
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|since3=c++20|dcl3= | |since3=c++20|dcl3= | ||
constexpr size_type size() const noexcept; | constexpr size_type size() const noexcept; | ||
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===Example=== | ===Example=== | ||
{{#switch:{{{1|}}} | {{#switch:{{{1|}}} | ||
| − | |set|multiset|unordered_set|unordered_multiset | + | |set|multiset|unordered_set|unordered_multiset |
={{include|cpp/container/set/example size|{{{1|}}}}} | ={{include|cpp/container/set/example size|{{{1|}}}}} | ||
| − | |map|multimap|unordered_map|unordered_multimap | + | |map|multimap|unordered_map|unordered_multimap |
={{include|cpp/container/map/example size|{{{1|}}}}} | ={{include|cpp/container/map/example size|{{{1|}}}}} | ||
|{{include|cpp/container/{{{1|}}}/example size}} | |{{include|cpp/container/{{{1|}}}/example size}} | ||
Revision as of 08:31, 27 December 2023
| size_type size() const noexcept; |
(since {std}) | |
Returns the number of elements in the container, i.e. std::distance(begin(), end()).
Contents |
Parameters
(none)
Return value
The number of elements in the container.
Complexity
Constant.
Example
| Templated content. The link is cpp/container/<PP>/example size |
See also
| checks whether the container is empty (public member function of std::{{{1}}})
| |
| returns the maximum possible number of elements (public member function of std::{{{1}}})
| |
| (C++17)(C++20) |
returns the size of a container or array (function template) |
