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_multimap
:
#include <unordered_map> #include <iostream> int main() { std::unordered_multimap<int,char> nums {{1, 'a'}, {3, 'b'}, {5, 'c'}, {7, 'd'}}; 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) |
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