1 files changed, 30 insertions, 0 deletions
diff --git a/Spv.Generator/TypeDeclarationKey.cs b/Spv.Generator/TypeDeclarationKey.cs
new file mode 100644
index 00000000..a4aa9563
--- /dev/null
+++ b/Spv.Generator/TypeDeclarationKey.cs
@@ -0,0 +1,30 @@
+using System;
+using System.Diagnostics.CodeAnalysis;
+
+namespace Spv.Generator
+{
+    internal struct TypeDeclarationKey : IEquatable<TypeDeclarationKey>
+    {
+        private Instruction _typeDeclaration;
+
+        public TypeDeclarationKey(Instruction typeDeclaration)
+        {
+            _typeDeclaration = typeDeclaration;
+        }
+
+        public override int GetHashCode()
+        {
+            return DeterministicHashCode.Combine(_typeDeclaration.Opcode, _typeDeclaration.GetHashCodeContent());
+        }
+
+        public bool Equals(TypeDeclarationKey other)
+        {
+            return _typeDeclaration.Opcode == other._typeDeclaration.Opcode && _typeDeclaration.EqualsContent(other._typeDeclaration);
+        }
+
+        public override bool Equals([NotNullWhen(true)] object obj)
+        {
+            return obj is TypeDeclarationKey && Equals((TypeDeclarationKey)obj);
+        }
+    }
+}