1 files changed, 70 insertions, 0 deletions
diff --git a/source/core/slang-castable.cpp b/source/core/slang-castable.cpp
new file mode 100644
index 000000000..f3c6541dd
--- /dev/null
+++ b/source/core/slang-castable.cpp
@@ -0,0 +1,70 @@
+// slang-castable.cpp
+#include "slang-castable.h"
+
+namespace Slang {
+
+/* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! CastableUtil !!!!!!!!!!!!!!!!!!!!!!!!!!! */
+
+/* static */ComPtr<ICastable> CastableUtil::getCastable(ISlangUnknown* unk)
+{
+    SLANG_ASSERT(unk);
+    ComPtr<ICastable> castable;
+    if (SLANG_SUCCEEDED(unk->queryInterface(SLANG_IID_PPV_ARGS(castable.writeRef()))))
+    {
+        SLANG_ASSERT(castable);
+    }
+    else
+    {
+        castable = new UnknownCastableAdapter(unk);
+    }
+    return castable;
+}
+
+/* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! UnknownCastableAdapter !!!!!!!!!!!!!!!!!!!!!!!!!!! */
+
+void* UnknownCastableAdapter::castAs(const Guid& guid)
+{
+    if (auto intf = getInterface(guid))
+    {
+        return intf;
+    }
+    if (auto obj = getObject(guid))
+    {
+        return obj;
+    }
+
+    if (m_found && guid == m_foundGuid)
+    {
+        return m_found;
+    }
+
+    ComPtr<ISlangUnknown> cast;
+    if (SLANG_SUCCEEDED(m_contained->queryInterface(guid, (void**)cast.writeRef())) && cast)
+    {
+        // Save the interface in the cache
+        m_found = cast;
+        m_foundGuid = guid;
+
+        return cast;
+    }
+    return nullptr;
+}
+
+void* UnknownCastableAdapter::getInterface(const Guid& guid)
+{
+    if (guid == ISlangUnknown::getTypeGuid() ||
+        guid == ICastable::getTypeGuid() ||
+        guid == IUnknownCastableAdapter::getTypeGuid())
+    {
+        return static_cast<IUnknownCastableAdapter*>(this);
+    }
+    return nullptr;
+}
+
+void* UnknownCastableAdapter::getObject(const Guid& guid)
+{
+    SLANG_UNUSED(guid);
+    return nullptr;
+}
+
+} // namespace Slang