[Utility][Container] Support non-nullable types in Array::Map #17094
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Prior to this commit, the `Array::Map` member function could only be applied to nullable object types. This was due to the internal use of `U()` as the default value for initializing the output `ArrayNode`, where `U` is the return type of the mapping function. This default constructor is only available for nullable types, and would result in a compile-time failure for non-nullable types. This commit replaces `U()` with `ObjectRef()` in `Array::Map`, removing this limitation. Since all items in the output array are overwritten before returning to the calling scope, initializing the output array with `ObjectRef()` does not violate type safety.
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This change is split out from #16183 as an independent change for ease of review. |
masahi
approved these changes
Jun 18, 2024
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Prior to this commit, the
Array::Mapmember function could only be applied to nullable object types. This was due to the internal use ofU()as the default value for initializing the outputArrayNode, whereUis the return type of the mapping function. This default constructor is only available for nullable types, and would result in a compile-time failure for non-nullable types.This commit replaces
U()withObjectRef()inArray::Map, removing this limitation. Since all items in the output array are overwritten before returning to the calling scope, initializing the output array withObjectRef()does not violate type safety.