Bug 291276 – REGRESSION (290899@main): Fix WTF::RetainPtrType when using `id` type

• Component: New Bugs
• Status: RESOLVED FIXED

[David Kilzer (:ddkilzer)]

Fix WTF::RetainPtrType when using `id` type.

This regressed in:

    Some RetainPtr cleanup [v2]
    https://bugs.webkit.org/show_bug.cgi?id=288291
    rdar://145371975
    <https://commits.webkit.org/290899@main>

Previously the check was `std::is_convertible_v<T, id> && !std::is_same_v<T, id>`:

```
-#ifdef __OBJC__
-    using HelperPtrType = typename std::conditional_t<std::is_convertible_v<T, id> && !std::is_same_v<T, id>, std::remove_pointer_t<T>, T>;
-#else
-    using HelperPtrType = PtrType;
-#endif
```

But that changed to `IsNSType<T>`:

```
+template<typename T> using RetainPtrType = std::conditional_t<IsNSType<T>, std::remove_pointer_t<T>, T>;
```

Which is defined as:

```
+template<typename T> constexpr bool IsNSType = std::is_convertible_v<T, id>;
```

<rdar://148273952>

[David Kilzer (:ddkilzer)]

Pull request: https://github.com/WebKit/WebKit/pull/43804

[EWS]

Committed 293440@main (43dfb26178e8): <https://commits.webkit.org/293440@main>

Reviewed commits have been landed. Closing PR #43804 and removing active labels.