From 65d8cfd82d790cfc902ab01686b3cb804e56cc4c Mon Sep 17 00:00:00 2001
From: Hans Goudey <h.goudey@me.com>
Date: Thu, 8 Jun 2023 17:42:36 -0400
Subject: [PATCH] BLI: Add hash function to quaternion type

Just reuse the 4D vector hash.
This allows creating a CPPType for math::Quaternion.
---
 source/blender/blenlib/BLI_math_quaternion_types.hh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/source/blender/blenlib/BLI_math_quaternion_types.hh b/source/blender/blenlib/BLI_math_quaternion_types.hh
index 685303330ed..c5ace7fc196 100644
--- a/source/blender/blenlib/BLI_math_quaternion_types.hh
+++ b/source/blender/blenlib/BLI_math_quaternion_types.hh
@@ -162,6 +162,11 @@ template<typename T> struct QuaternionBase {
     return (a.w == b.w) && (a.x == b.x) && (a.y == b.y) && (a.z == b.z);
   }
 
+  uint64_t hash() const
+  {
+    return VecBase<T, 4>(*this).hash();
+  }
+
   friend std::ostream &operator<<(std::ostream &stream, const QuaternionBase &rot)
   {
     return stream << "Quaternion" << static_cast<VecBase<T, 4>>(rot);