std::unordered_map size() method
- since C++11
// Const version only
size_type size() const noexcept;
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.
Complexity
Constant.
Exceptions
(none)
Example
Main.cpp
#include <unordered_map>
#include <iostream>
int main()
{
std::unordered_map<int,char> nums {{1, 'a'}, {3, 'b'}, {5, 'c'}, {7, 'd'}};
std::cout << "nums contains " << nums.size() << " elements.\n";
}
Output
nums contains 4 elements.
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