xorp

minitraits.hh

00001 // -*- c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t -*-
00002 // vim:set sts=4 ts=8:
00003 
00004 // Copyright (c) 2001-2009 XORP, Inc.
00005 //
00006 // This program is free software; you can redistribute it and/or modify
00007 // it under the terms of the GNU Lesser General Public License, Version
00008 // 2.1, June 1999 as published by the Free Software Foundation.
00009 // Redistribution and/or modification of this program under the terms of
00010 // any other version of the GNU Lesser General Public License is not
00011 // permitted.
00012 // 
00013 // This program is distributed in the hope that it will be useful, but
00014 // WITHOUT ANY WARRANTY; without even the implied warranty of
00015 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For more details,
00016 // see the GNU Lesser General Public License, Version 2.1, a copy of
00017 // which can be found in the XORP LICENSE.lgpl file.
00018 // 
00019 // XORP, Inc, 2953 Bunker Hill Lane, Suite 204, Santa Clara, CA 95054, USA;
00020 // http://xorp.net
00021 
00022 // $XORP: xorp/libxorp/minitraits.hh,v 1.10 2008/10/02 21:57:32 bms Exp $
00023 
00024 #ifndef __LIBXORP_MINITRAITS_HH__
00025 #define __LIBXORP_MINITRAITS_HH__
00026 
00034 template <typename T>
00035 class MiniTraits {
00036     template <class U>
00037     struct UnConst {
00038     typedef U Result;
00039     };
00040     template <class U>
00041     struct UnConst <const U> {
00042         typedef U Result;
00043     };
00044 public:
00045     typedef typename UnConst<T>::Result NonConst;
00046 };
00047 
00062 template <typename B, typename D>
00063 class BaseAndDerived {
00064     struct X {
00065     static char f(const B*);
00066     static double f(...);
00067     };
00068 
00069 public:
00070     static const bool True = ( sizeof(X::f((D*)0)) == sizeof(X::f((B*)0)) );
00071 };
00072 
00073 #endif // __LIBXORP_MINITRAITS_HH__
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