From 5b0f5b52b9f904c8b6051ac4d6e71d435351bf9e Mon Sep 17 00:00:00 2001
From: dpasukhi <dpasukhi@opencascade.com>
Date: Thu, 14 Dec 2023 21:39:25 +0000
Subject: [PATCH] 0033554: Foundation Classes - Missed hash specialization for
 enumerations

Fixed problem with missed hash specialization
---
 src/NCollection/NCollection_DefaultHasher.hxx | 44 ++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

diff --git a/src/NCollection/NCollection_DefaultHasher.hxx b/src/NCollection/NCollection_DefaultHasher.hxx
index 4007ea2739..188bb1b23f 100644
--- a/src/NCollection/NCollection_DefaultHasher.hxx
+++ b/src/NCollection/NCollection_DefaultHasher.hxx
@@ -29,8 +29,50 @@
  *              IsEqual.
 */
 template <class TheKeyType>
-DEFINE_HASHER(NCollection_DefaultHasher, TheKeyType, std::hash<TheKeyType>, std::equal_to<TheKeyType>)
+struct NCollection_DefaultHasher
+{
+  size_t operator()(const TheKeyType& theKey) const noexcept
+  {
+    return HashCode<TheKeyType>(theKey);
+  }
+  bool operator() (const TheKeyType& theK1, const TheKeyType& theK2) const noexcept
+  {
+    return IsEqual<TheKeyType>(theK1, theK2);
+  }
 
+private:
+  // For non-enums
+  template <class T = TheKeyType>
+  typename std::enable_if<!std::is_enum<T>::value, size_t>::type
+    HashCode(const TheKeyType& theKey) const noexcept
+  {
+    return std::hash<TheKeyType>{}(theKey);
+  }
+
+  // For non-enums
+  template <class T = TheKeyType>
+  typename std::enable_if<!std::is_enum<T>::value, bool>::type
+    IsEqual(const TheKeyType& theK1, const TheKeyType& theK2) const noexcept
+  {
+    return std::equal_to<TheKeyType>{}(theK1, theK2);
+  }
+
+  // For enums
+  template <class T = TheKeyType>
+  typename std::enable_if<std::is_enum<T>::value, size_t>::type
+    HashCode(const TheKeyType& theKey) const noexcept
+  {
+    return static_cast<size_t>(theKey);
+  }
+
+  // For enums
+  template <class T = TheKeyType>
+  typename std::enable_if<std::is_enum<T>::value, bool>::type
+    IsEqual(const TheKeyType& theK1, const TheKeyType& theK2) const noexcept
+  {
+    return theK1 == theK2;
+  }
+};
 
 #define DEFINE_DEFAULT_HASHER_PURE(TheKeyType)              \
 template <> struct NCollection_DefaultHasher<TheKeyType>    \