[ios, macos] Layer manager for Darwin platforms

The newly introduced `MGLStyleLayerManager` is now responsible
for creating both style layer objects and their obj C peers on Darwin.

1 files changed, 17 insertions, 0 deletions

diff --git a/platform/darwin/src/MGLStyleLayer_Private.h b/platform/darwin/src/MGLStyleLayer_Private.h
index ea43c680e0..0d6e4094bd 100644
--- a/platform/darwin/src/MGLStyleLayer_Private.h
+++ b/platform/darwin/src/MGLStyleLayer_Private.h
@@ -82,4 +82,21 @@ struct LayerWrapper {
 
 @end
 
+namespace mbgl {
+
+class LayerPeerFactory {
+public:
+    virtual ~LayerPeerFactory() = default;
+    /**
+     Get the corresponding core layer factory.
+     */
+    virtual style::LayerFactory* getCoreLayerFactory() = 0;
+    /**
+     Creates an MGLStyleLayer instance with a raw pointer to the backing store.
+     */
+    virtual MGLStyleLayer* createPeer(style::Layer*) = 0;
+};
+
+}  // namespace mbgl
+
 NS_ASSUME_NONNULL_END