Difference between revisions of "cpp/container/deque/size"
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Latest revision as of 17:52, 11 November 2021
| size_type size() const; |
(noexcept since C++11) | |
Returns the number of elements in the container, i.e. std::distance(begin(), end()).
Contents |
[edit] Parameters
(none)
[edit] Return value
The number of elements in the container.
[edit] Complexity
Constant.
[edit] Example
The following code uses size to display the number of elements in a std::deque:
Run this code
#include <deque> #include <iostream> int main() { std::deque<int> nums{1, 3, 5, 7}; std::cout << "nums contains " << nums.size() << " elements.\n"; }
Output:
nums contains 4 elements.
[edit] See also
| checks whether the container is empty (public member function) | |
| returns the maximum possible number of elements (public member function) | |
| changes the number of elements stored (public member function) | |
| (C++17)(C++20) |
returns the size of a container or array (function template) |
