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Problem:
- `is_zero()` is implemented by checking each value in the array by
hand. This is error-prone and less expressive than using an
algorithm.
Solution:
- Implement `is_zero()` in terms of `all_of`.
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Problem:
- C-style arrays do not automatically provide bounds checking and are
less type safe overall.
- `__builtin_memcmp` is not a constant expression in the current gcc.
Solution:
- Change private m_data to be AK::Array.
- Eliminate constructor from C-style array.
- Change users of the C-style array constructor to use the default
constructor.
- Change `operator==()` to be a hand-written comparison loop and let
the optimizer figure out to use `memcmp`.
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Problem:
- `MACAddress` class is not usable in a compile-time context.
- `__builtin_memcpy` is not constexpr in gcc.
Solution:
- Decorate functions with `constexpr` keyword.
- Use default constructors and destructors.
- Change `__builtin_memcpy` to a hand-written `for` loop and let the
compiler's optimizer take care of it.
- Add tests to ensure compile-time capabilities.
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Problem:
- There are no unit tests for `MACAddress` class. This makes it
difficult to refactor and ensure the same behavior.
- `m_data` private member variable is uninitialized leading to undefined
behavior of `is_zero()`.
Solution:
- Add unit tests to cover basic functionality.
- Initialize `m_data`.
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