Difference between revisions of "cpp/container/array/size"
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(std::array size is constexpr. And noexcept.) |
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Revision as of 15:07, 14 August 2011
| constexpr size_type size() const noexcept; |
(since C++11) | |
Returns the number of elements in the container, i.e. std::distance(begin(), end()).
Contents |
Parameters
(none)
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::array:
Run this code
#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.
See also
| checks whether the container is empty (public member function) | |
| returns the maximum possible number of elements (public member function) | |
| (C++17)(C++20) |
returns the size of a container or array (function template) |
