Difference between revisions of "cpp/container/unordered multimap/size"
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< cpp | container | unordered multimap
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Latest revision as of 11:53, 4 December 2021
size_type size() const noexcept; |
(since C++11) (constexpr since C++26) |
|
Returns the number of elements in the container.
Contents |
[edit] Return value
std::distance(begin(), end())
[edit] Complexity
Constant.
[edit] Example
Run this code
#include <cassert> #include <unordered_map> int main() { std::unordered_multimap<int, char> nums{{1, 'a'}, {1, 'b'}, {2, 'c'}, {2, 'd'}}; assert(nums.size() == 4); }
[edit] See also
| checks whether the container is empty (public member function) | |
| returns the maximum possible number of elements (public member function) | |
| (C++17)(C++20) |
returns the size of a container or array (function template) |
