37a087c675
This updates the code generation for style layers to add a test to check that the style object returned from mbgl can be safely cast into the expected type so ownership can be returned to the caller when removing layers. This scenario was previously possible if a layer of type T was added before a layer of type U but both layers shared the same identifier. In that case, if the pointer to the second layer of type U was used to remove a layer, a runtime exception would occur since mbgl returns the layer with type T (the first one added). Now, an exception will still occur if layers with the same identifier are manipulated as described above but it is done as part of a validation check for all public style layer methods at the Darwin platform level. The NSException attempts to warn developers about using and reusing style identifiers to avoid this issue in the first place.
Darwin
The code in the Darwin platform targets Apple platforms but is not specific to iOS or macOS. This code is not distributed as an SDK in itself, but is required by the Mapbox iOS SDK and Mapbox macOS SDK.
These files depend on the Foundation and Core Foundation frameworks but do not depend on iOS- or macOS–specific frameworks, such as UIKit or AppKit. Any non-cross-platform code is guarded by TargetConditionals.h macros.