[core] Move *TileID hashing to separate impl

1 files changed, 29 insertions, 0 deletions

diff --git a/src/mbgl/tile/tile_id_hash.cpp b/src/mbgl/tile/tile_id_hash.cpp
new file mode 100644
index 0000000000..4a1f185817
--- /dev/null
+++ b/src/mbgl/tile/tile_id_hash.cpp
@@ -0,0 +1,29 @@
+#include <mbgl/tile/tile_id.hpp>
+
+#include <boost/functional/hash.hpp>
+
+namespace std {
+
+size_t hash<mbgl::CanonicalTileID>::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;
+}
+
+size_t hash<mbgl::UnwrappedTileID>::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;
+}
+
+size_t hash<mbgl::OverscaledTileID>::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