1 files changed, 35 insertions, 1 deletions
diff --git a/source/slang/type-defs.h b/source/slang/type-defs.h
index 34c5b5936..72bf6fe4c 100644
--- a/source/slang/type-defs.h
+++ b/source/slang/type-defs.h
@@ -492,4 +492,38 @@ protected:
     virtual int GetHashCode() override;
     virtual Type* CreateCanonicalType() override;
 )
-END_SYNTAX_CLASS()
-\ No newline at end of file
+END_SYNTAX_CLASS()
+
+// A type created to represent the result of filtering
+// the fields of an aggregate type.
+SYNTAX_CLASS(FilteredTupleType, Type)
+RAW(
+    struct Element
+    {
+        // The original field this element represents
+        DeclRef<VarDeclBase>    fieldDeclRef;
+
+        // The type being used for the new field
+        RefPtr<Type>            type;
+    };
+)
+
+    FIELD(RefPtr<Type>, originalType);
+    FIELD(List<Element>, elements);
+
+RAW(
+    FilteredTupleType()
+    {}
+
+    RefPtr<Type> getOriginalType() const { return originalType; }
+    List<Element> const& getElements() const { return elements;  }
+    virtual String ToString() override;
+
+protected:
+    virtual RefPtr<Val> SubstituteImpl(Substitutions* subst, int* ioDiff) override;
+    virtual bool EqualsImpl(Type * type) override;
+    virtual int GetHashCode() override;
+    virtual Type* CreateCanonicalType() override;
+)
+
+END_SYNTAX_CLASS()