From bb1f9b23e7ff8b48153f486e24be2122a4604ac7 Mon Sep 17 00:00:00 2001
From: Valentin Shergin <shergin@fb.com>
Date: Sun, 1 Dec 2019 19:21:29 -0800
Subject: [PATCH] Fabric: Using better::map instead of std::unordered_map in
 ShadowTreeRegistry

Summary:
Becasue better one is more efficient.

Changelog: [Internal] Fabric-specific internal change.

Reviewed By: sammy-SC

Differential Revision: D18626666

fbshipit-source-id: 143dab1dd4c2e168368d2ca14bf2ffc8367d71ea
---
 ReactCommon/fabric/core/primitives/ReactPrimitives.h | 1 -
 ReactCommon/fabric/mounting/ShadowTreeRegistry.h     | 3 ++-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/ReactCommon/fabric/core/primitives/ReactPrimitives.h b/ReactCommon/fabric/core/primitives/ReactPrimitives.h
index 85bdb3a7d45..f38489dc3c7 100644
--- a/ReactCommon/fabric/core/primitives/ReactPrimitives.h
+++ b/ReactCommon/fabric/core/primitives/ReactPrimitives.h
@@ -12,7 +12,6 @@
 #include <react/core/RawValue.h>
 #include <memory>
 #include <string>
-#include <unordered_map>
 
 namespace facebook {
 namespace react {
diff --git a/ReactCommon/fabric/mounting/ShadowTreeRegistry.h b/ReactCommon/fabric/mounting/ShadowTreeRegistry.h
index 5fc69bb5d1f..4ccc306021f 100644
--- a/ReactCommon/fabric/mounting/ShadowTreeRegistry.h
+++ b/ReactCommon/fabric/mounting/ShadowTreeRegistry.h
@@ -7,6 +7,7 @@
 
 #pragma once
 
+#include <better/map.h>
 #include <better/mutex.h>
 
 #include <react/core/ReactPrimitives.h>
@@ -60,7 +61,7 @@ class ShadowTreeRegistry final {
 
  private:
   mutable better::shared_mutex mutex_;
-  mutable std::unordered_map<SurfaceId, std::unique_ptr<ShadowTree>>
+  mutable better::map<SurfaceId, std::unique_ptr<ShadowTree>>
       registry_; // Protected by `mutex_`.
 };