std::deque<T,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
The following code uses size to display the number of elements in a std::deque:
#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.
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) |
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