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What is the difference between size() and max_size() functions for std: :array in C++?
array<int,5> arr{ 1, 2, 3, 4, 5 };
cout << arr.size();
/* Output : 5 */
array<int, 5> arr{ 1, 2, 3, 4, 5 };
cout << arr.max_size();
/* Output : 5 */
What is the difference between size() and max_size() functions for std: :array in C++?
The latter has prefix max_. There is no other practical difference between them for std::array.
The difference is conceptual. size is the current number of elements in the container, and max_size is a theoretical upper bound to how many elements the container could have. Since the number of elements in std::array is constant, the current number of elements is exactly the same as the number of elements there can ever be. For other containers, there is a practical difference.
Using the max_size member function of std::array is conceptually silly. It exists so that std::array conforms to the Container concept (e.g. named requirement), which allows it to be used uniformly with other containers, which is useful within templates.
