How to inherit from array built in class in c++

Question

I want to make a class that inherits from base array class, and just add some new functionality for the sake of learning.

Now when I try using this code


class checkInherit : public array

Error is

C++ argument list for class template is missing

Which I think is that I have to add some arguments. When I Peeked into Array built in array code, this is the code

// TUPLE INTERFACE TO array
template <class _Ty, size_t _Size>
class array;

template <class _Ty, size_t _Size>
struct tuple_size<array<_Ty, _Size>>
    : integral_constant<size_t, _Size> { // struct to determine number of elements in array

Now is there any way I can do this?

EDIT: My assignment at University is to make circular queue using built in arrays. Now What my thought is that If I somehow inherits from std::array and add some extra functions in it to make it act as circular queue. It might not be possible but at least I want to inherit std::array so that I can give it a try.

You shouldn't inherit from types that do not have a virtual destructor. What is the extra functionality you're trying to add? — PaulMcKenzie
– PaulMcKenzie, Commented Jun 16, 2020 at 12:21
I am given the assignment of the circular queue with array in my university. I thought why not inherit from the built-in an array and add the functionality which makes it circular queue. — Ahmad Anis
– Ahmad Anis, Commented Jun 16, 2020 at 12:23
@AhmadAnis - I'd suggest your problem is better solved with composition instead of inheritance. If you want to use inheritance though, you need to provide the template arguments (e.g., class checkInherit : public std::array<int, 17>). — Stephen Newell
– Stephen Newell, Commented Jun 16, 2020 at 12:26
@StephenNewell, It is giving error of TUPLE INTERFACE TO array at std::array and incomplete type is not allowed1 at <int,17> — Ahmad Anis
– Ahmad Anis, Commented Jun 16, 2020 at 12:29
@AhmadAnis -- What you are probably looking for is a container adapter. Look at std::stack for example. By default, a std::deque is used as the container, but can be changed using a template argument. — PaulMcKenzie
– PaulMcKenzie, Commented Jun 16, 2020 at 12:29

Basile Starynkevitch · Accepted Answer · 2020-06-16 12:34:34Z

1

If your array is the standard std::array template, I won't recommend inheriting from it.

I want to make a class that inherits from base array class, and just add some new functionality for the sake of learning.

That smells like a very bad idea. Read a good C++ programming book then a C++ reference.

If you really want to do that, be sure to follow the C++ rule of five.

You might want to have a member in your class checkInherit which is some std::array, and redefine the appropriate member functions and operators.

This is just a guess.

edited Jun 16, 2020 at 12:34

answered Jun 16, 2020 at 12:29

Basile Starynkevitch

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1 Comment

Ahmad Anis Over a year ago

Yea, I guess this is not a good idea, and I will do it with member in my class which is std::array. Thanks

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