[core] #3980 - Switching Core GL instances of map to unordered_map

1 files changed, 34 insertions, 0 deletions

diff --git a/src/mbgl/tile/tile_id.hpp b/src/mbgl/tile/tile_id.hpp
index f561db9a4d..88b01269e5 100644
--- a/src/mbgl/tile/tile_id.hpp
+++ b/src/mbgl/tile/tile_id.hpp
@@ -8,6 +8,7 @@
 #include <algorithm>
 #include <iosfwd>
 #include <cassert>
+#include <boost/functional/hash.hpp>
 
 namespace mbgl {
 
@@ -254,3 +255,36 @@ inline float UnwrappedTileID::pixelsToTileUnits(const float pixelValue, const fl
 }
 
 } // namespace mbgl
+
+namespace std {
+
+template <> struct hash<mbgl::CanonicalTileID> {
+    size_t operator()(const mbgl::CanonicalTileID &id) const {
+        std::size_t seed = 0;
+        boost::hash_combine(seed, id.x);
+        boost::hash_combine(seed, id.y);
+        boost::hash_combine(seed, id.z);
+        return seed;
+    }
+};
+    
+template <> struct hash<mbgl::UnwrappedTileID> {
+    size_t operator()(const mbgl::UnwrappedTileID &id) const {
+        std::size_t seed = 0;
+        boost::hash_combine(seed, std::hash<mbgl::CanonicalTileID>{}(id.canonical));
+        boost::hash_combine(seed, id.wrap);
+        return seed;
+    }
+};
+    
+template <> struct hash<mbgl::OverscaledTileID> {
+    size_t operator()(const mbgl::OverscaledTileID &id) const {
+        std::size_t seed = 0;
+        boost::hash_combine(seed, std::hash<mbgl::CanonicalTileID>{}(id.canonical));
+        boost::hash_combine(seed, id.overscaledZ);
+        return seed;
+    }
+};
+
+} // namespace std
+