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diff --git a/external/vpc/public/tier0/mem.h b/external/vpc/public/tier0/mem.h
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+//========= Copyright (c) 1996-2005, Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Memory allocation!
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef TIER0_MEM_H
+#define TIER0_MEM_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include <stddef.h>
+
+
+#include "tier0/platform.h"
+
+#if !defined(STATIC_TIER0) && !defined(_STATIC_LINKED)
+
+#ifdef TIER0_DLL_EXPORT
+# define MEM_INTERFACE DLL_EXPORT
+#else
+# define MEM_INTERFACE DLL_IMPORT
+#endif
+
+#else // BUILD_AS_DLL
+
+#define MEM_INTERFACE extern
+
+#endif // BUILD_AS_DLL
+
+
+
+//-----------------------------------------------------------------------------
+// DLL-exported methods for particular kinds of memory
+//-----------------------------------------------------------------------------
+MEM_INTERFACE void *MemAllocScratch( int nMemSize );
+MEM_INTERFACE void MemFreeScratch();
+
+#if defined( POSIX )
+MEM_INTERFACE void ZeroMemory( void *mem, size_t length );
+#endif
+
+//Only works with USE_MEM_DEBUG and memory allocation call stack tracking enabled.
+MEM_INTERFACE int GetAllocationCallStack( void *mem, void **pCallStackOut, int iMaxEntriesOut );
+
+
+#endif /* TIER0_MEM_H */