std::map<Key,T,Compare,Allocator>::size
size_type size() const; | (noexcept since C++11) |
Returns the number of elements in the container, i.e., std::distance(begin(), end()).
Return value
The number of elements in the container.
Complexity
Constant.
Example
#include <cassert>
#include <map>
int main()
{
std::map<int, char> nums{{1, 'a'}, {1, 'b'}, {2, 'c'}, {2, 'd'}};
assert(nums.size() == 2);
}
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) |
© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/cpp/container/map/size
