| (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: noexceptComplexity
Constant.
Example
The following code uses size to display the number of elements in a std::unordered_map:
1 2 3 4 5 6 7 8 9 | #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:
1 | 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) |
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