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public/datamodel/dmelementhandle.h

@@ -0,0 +1,47 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================
+
+#ifndef DMELEMENTHANDLE_H
+#define DMELEMENTHANDLE_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+//-----------------------------------------------------------------------------
+// handle to an CDmElement
+//-----------------------------------------------------------------------------
+#define PERFORM_HANDLE_TYPECHECKING 0
+#if PERFORM_HANDLE_TYPECHECKING
+
+// this is here to make sure we're being type-safe about element handles
+// otherwise, the compiler lets us cast to bool incorrectly
+// the other solution would be to redefine DmElementHandle_t s.t. DMELEMENT_HANDLE_INVALID==0
+struct DmElementHandle_t
+{
+	DmElementHandle_t() : handle( 0xffffffff ) {}
+	explicit DmElementHandle_t( int h ) : handle( h ) {}
+	inline bool operator==( const DmElementHandle_t &h ) const { return handle == h.handle; }
+	inline bool operator!=( const DmElementHandle_t &h ) const { return handle != h.handle; }
+	inline bool operator<( const DmElementHandle_t &h ) const { return handle < h.handle; }
+//	inline operator int() const { return handle; } // if we're okay with implicit int casts, uncomment this method
+	int handle;
+};
+const DmElementHandle_t DMELEMENT_HANDLE_INVALID;
+
+#else // PERFORM_HANDLE_TYPECHECKING
+
+enum DmElementHandle_t
+{
+	DMELEMENT_HANDLE_INVALID = 0xffffffff
+};
+
+#endif // PERFORM_HANDLE_TYPECHECKING
+
+
+
+#endif // DMELEMENTHANDLE_H