refactor context to be implicit-downcast safe#31622
Merged
jonahwilliams merged 1 commit intoflutter:masterfrom Apr 25, 2019
Merged
refactor context to be implicit-downcast safe#31622jonahwilliams merged 1 commit intoflutter:masterfrom
jonahwilliams merged 1 commit intoflutter:masterfrom
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tvolkert
reviewed
May 1, 2019
| if (value == null && _parent != null) { | ||
| value = _parent.get<T>(); | ||
| } | ||
| return _unboxNull(value ?? _generateIfNecessary(T, _fallbacks)) as T; |
Contributor
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You can avoid the as here by saying:
T result = _unboxNull(value ?? _generateIfNecessary(T, _fallbacks));
return result;(you can do the same above in AppContext get context)
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Description
Deprecate
Context.operator[]and replace it withContext.get<T>()which uses the generic to look up the token. This allows us to use theTto perform anascast to remove all context related implicit downcasts.Old method is marked as deprecated to make it easier to migrate g3 usages of tool context.
Replaces #31031
Related Issues
#13815