Nika Layzell 10582b6528 Bug 1607634 - Part 1: Improve the ergonomics of using NotNull with RefPtr and nsCOMPtr, r=glandium
This does a few minor improvements:
1. Adds implicit conversions from NotNull to a raw pointer type if supported by
   the underlying type, to make it so NotNull<RefPtr<T>> acts more like
   RefPtr<T> in some situations.
2. Adds explicit conversion constructors and assignment operators for RefPtr
   and nsCOMPtr from NotNull, avoiding conversion ambiguity added by the first
   change.
3. Disable conversion constructors on NotNull with SFINAE if they should not be
   available, meaning that type traits like std::is_convertible_v interact with
   it properly.

Differential Revision: https://phabricator.services.mozilla.com/D168883
2023-03-20 15:40:35 +00:00
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