[core, ios, macos] Refactor composite stop types and conversions

1 files changed, 32 insertions, 0 deletions

diff --git a/include/mbgl/style/function/composite_interval_stops.hpp b/include/mbgl/style/function/composite_interval_stops.hpp
new file mode 100644
index 0000000000..3c495f2a7f
--- /dev/null
+++ b/include/mbgl/style/function/composite_interval_stops.hpp
@@ -0,0 +1,32 @@
+#pragma once
+
+#include <mbgl/style/function/interval_stops.hpp>
+
+#include <map>
+
+namespace mbgl {
+namespace style {
+
+template <class T>
+class CompositeIntervalStops {
+public:
+    using Stops = std::map<float, std::map<float, T>>;
+    Stops stops;
+
+    CompositeIntervalStops() = default;
+    CompositeIntervalStops(Stops stops_)
+        : stops(std::move(stops_)) {
+    }
+
+    IntervalStops<T> innerStops(const std::map<float, T>& stops_) const {
+        return IntervalStops<T>(stops_);
+    }
+
+    friend bool operator==(const CompositeIntervalStops& lhs,
+                           const CompositeIntervalStops& rhs) {
+        return lhs.stops == rhs.stops;
+    }
+};
+
+} // namespace style
+} // namespace mbgl