constexpr size_type size() const noexcept; | (since C++11) |
Returns the number of elements in the container, i.e. std::distance(begin(), end()).
(none).
The number of elements in the container.
Constant.
The following code uses size to display the number of elements in a std::array:
#include <array>
#include <iostream>
int main()
{
std::array<int, 4> nums {1, 3, 5, 7};
std::cout << "nums contains " << nums.size() << " elements.\n";
}Output:
nums contains 4 elements.
|
(C++11) | checks whether the container is empty (public member function) |
|
(C++11) | returns the maximum possible number of elements (public member function) |
|
(C++17)(C++20) | returns the size of a container or array (function template) |
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