Make Source::getZoomRange return an optional range

2 files changed, 4 insertions, 3 deletions

diff --git a/src/mbgl/annotation/annotation_source.cpp b/src/mbgl/annotation/annotation_source.cpp
index 7434029c4b..c52836c500 100644
--- a/src/mbgl/annotation/annotation_source.cpp
+++ b/src/mbgl/annotation/annotation_source.cpp
@@ -14,8 +14,8 @@ AnnotationSource::Impl::Impl(Source& base_)
     : Source::Impl(SourceType::Annotations, AnnotationManager::SourceID, base_) {
 }
 
-Range<uint8_t> AnnotationSource::Impl::getZoomRange() const {
-    return { 0, 22 };
+optional<Range<uint8_t>> AnnotationSource::Impl::getZoomRange() const {
+    return { { 0, 22 } };
 }
 
 void AnnotationSource::Impl::loadDescription(FileSource&) {
diff --git a/src/mbgl/annotation/annotation_source.hpp b/src/mbgl/annotation/annotation_source.hpp
index 62d1aa3488..07e00dc52d 100644
--- a/src/mbgl/annotation/annotation_source.hpp
+++ b/src/mbgl/annotation/annotation_source.hpp
@@ -18,9 +18,10 @@ public:
 
     void loadDescription(FileSource&) final;
 
+    optional<Range<uint8_t>> getZoomRange() const final;
+
 private:
     uint16_t getTileSize() const final { return util::tileSize; }
-    Range<uint8_t> getZoomRange() const final;
 
     std::unique_ptr<Tile> createTile(const OverscaledTileID&, const style::UpdateParameters&) final;
 };