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diff --git a/public/tier1/convar_serverbounded.h b/public/tier1/convar_serverbounded.h
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+++ b/public/tier1/convar_serverbounded.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Helper class for cvars that have restrictions on their value.
+//
+//=============================================================================//
+
+#ifndef CONVAR_SERVERBOUNDED_H
+#define CONVAR_SERVERBOUNDED_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+// This class is used to virtualize a ConVar's value, so the client can restrict its 
+// value while connected to a server. When using this across modules, it's important
+// to dynamic_cast it to a ConVar_ServerBounded or you won't get the restricted value.
+//
+// NOTE: FCVAR_USERINFO vars are not virtualized before they are sent to the server
+//       (we have no way to detect if the virtualized value would change), so
+//       if you want to use a bounded cvar's value on the server, you must rebound it
+//       the same way the client does.
+class ConVar_ServerBounded : public ConVar
+{
+public:
+	ConVar_ServerBounded( char const *pName, char const *pDefaultValue, int flags, char const *pHelpString )
+		: ConVar( pName, pDefaultValue, flags, pHelpString ) 
+	{
+	}
+
+	ConVar_ServerBounded( char const *pName, char const *pDefaultValue, int flags, char const *pHelpString, FnChangeCallback_t callback )
+		: ConVar( pName, pDefaultValue, flags, pHelpString, callback ) 
+	{
+	}
+	
+	ConVar_ServerBounded( char const *pName, char const *pDefaultValue, int flags, char const *pHelpString, bool bMin, float fMin, bool bMax, float fMax )
+		: ConVar( pName, pDefaultValue, flags, pHelpString, bMin, fMin, bMax, fMax ) {}
+
+	// You must implement GetFloat.
+	virtual float GetFloat() const = 0;
+	
+	// You can optionally implement these.
+	virtual int  GetInt() const		{ return (int)GetFloat(); }
+	virtual bool GetBool() const	{  return ( GetInt() != 0 ); }
+
+	// Use this to get the underlying cvar's value.
+	float GetBaseFloatValue() const
+	{
+		return ConVar::GetFloat();
+	}
+};
+
+
+#endif // CONVAR_SERVERBOUNDED_H