std::unordered_set::size
From cppreference.com
< cpp | container | unordered set
| size_type size() const; |
(since C++11) | |
Returns the number of elements in the container, i.e. std::distance(begin(), end()).
Parameters
(none)
Return value
The number of elements in the container.
Exceptions
noexcept specification:
noexcept
Complexity
Constant.
Example
The following code uses size to display the number of elements in a std::unordered_set<int>:
Run this code
#include <unordered_set> #include <iostream> int main() { std::unordered_set<int> nums {1, 3, 5, 7}; std::cout << "nums contains " << nums.size() << " elements.\n"; }
Output:
nums contains 4 elements.
See also
| checks whether the container is empty (public member function) | |
| returns the maximum possible number of elements (public member function) |