Lenny Maiorani 2a06b026ef Vector: C++20 equality operators ...

Problem:
- C++20 changes the way equality operators are generated. This results
  in overload ambiguity as reported by clang.

Solution:
- Remove `AK::Vector::operator!=` because it will be automatically
  generated in terms of `AK::Vector::operator==`.
- Change `AK::Vector::operator==` to be a function template so that
  overload resolution is not confused about `a == b` vs `b == a`.
- Add tests to ensure the behavior works.

Notes:
- There is more info available at
  https://brevzin.github.io/c++/2019/07/28/comparisons-cpp20/ for
  deeper discussion about overload resolution, operator rewriting, and
  generated functions.

2020-11-16 10:06:23 +01:00

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