1 files changed, 41 insertions, 0 deletions
diff --git a/source/core/slang-destroyable.h b/source/core/slang-destroyable.h
new file mode 100644
index 000000000..4e6be2629
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+++ b/source/core/slang-destroyable.h
@@ -0,0 +1,41 @@
+#ifndef SLANG_CORE_DESTROYABLE_H
+#define SLANG_CORE_DESTROYABLE_H
+
+#include "slang-string.h"
+
+#include "../../slang-com-helper.h"
+#include "../../slang-com-ptr.h"
+
+namespace Slang
+{
+
+/* An interface to provide a mechanism to cast, that doesn't require ref counting 
+and doesn't have to return a pointer to a ISlangUnknown derived class */
+class ICastable : public ISlangUnknown
+{
+    SLANG_COM_INTERFACE(0x87ede0e1, 0x4852, 0x44b0, { 0x8b, 0xf2, 0xcb, 0x31, 0x87, 0x4d, 0xe2, 0x39 } );
+
+        /// Can be used to cast to interfaces without reference counting. 
+        /// Also provides access to internal implementations, when they provide a guid
+        /// Can simulate a 'generated' interface as long as kept in scope by cast from. 
+    virtual SLANG_NO_THROW void* SLANG_MCALL castAs(const Guid& guid) = 0;
+};
+
+/* An interface that allows for an object to implement 'destruction'. A destroyed 
+interface/object should release any other contained references. 
+Behavior of an interface that is IDestroyed should be defined on the interface. Typically 
+it will produce an assert on debug builds. 
+Calling destroy/isDestroyed can always be performed. */
+class IDestroyable : public ICastable
+{
+    SLANG_COM_INTERFACE(0x99c6228e, 0xa82, 0x43eb, { 0x8f, 0xd1, 0xf3, 0x54, 0x3e, 0x2e, 0x86, 0xc0 } );
+
+        /// Destroy. Can call on destroyed - is a no op.
+    virtual SLANG_NO_THROW void SLANG_MCALL destroy() = 0;
+        /// Once destroyed *no* functionality is supported other than IUnknown and destroy/isDestroyed
+    virtual SLANG_NO_THROW bool SLANG_MCALL isDestroyed() = 0;
+};
+
+}
+
+#endif // SLANG_CORE_DESTROYABLE_H