base/static_check

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/****************************************************************************
  Copyright (C)2001 by Andrei Alexandrescu

  This file is a derivative of a file from the Loki Library written by
  Andrei Alexandrescu.  It was distributed by him under the terms
  listed below (titled Loki Original Distribution Terms).
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  notice here and the copyright notice and permission notice
  in supporting documentation.  The terms do *not* require
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  below.  The GPL does not require you to maintain the terms of
  the Loki Original Distribution Terms, but you are encouraged to do so.

  This program/file is free software; you can redistribute it and/or modify
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 ****************************************************************************
  Loki Original Distribution Terms:

  The Loki Library
  Copyright (c) 2001 by Andrei Alexandrescu
  This code accompanies the book:
  Alexandrescu, Andrei. "Modern C++ Design: Generic Programming and Design 
      Patterns Applied". Copyright (c) 2001. Addison-Wesley.
  Permission to use, copy, modify, distribute and sell this software for any 
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 ****************************************************************************

  $Id: static_check 1029 2004-02-11 20:45:54Z jungd $
  $Revision: 1.1 $
  $Date: 2004-02-11 15:45:54 -0500 (Wed, 11 Feb 2004) $
  $Author: jungd $
 
****************************************************************************/

// Last update: June 20, 2001

#ifndef STATIC_CHECK_INC_
#define STATIC_CHECK_INC_

namespace base
{
////////////////////////////////////////////////////////////////////////////////
// Helper structure for the STATIC_CHECK macro
////////////////////////////////////////////////////////////////////////////////

    template<int> struct CompileTimeError;
    template<> struct CompileTimeError<true> {};
}

////////////////////////////////////////////////////////////////////////////////
// macro STATIC_CHECK
// Invocation: STATIC_CHECK(expr, id)
// where:
// expr is a compile-time integral or pointer expression
// id is a C++ identifier that does not need to be defined
// If expr is zero, id will appear in a compile-time error message.
////////////////////////////////////////////////////////////////////////////////

#define STATIC_CHECK(expr, msg) \
    { base::CompileTimeError<((expr) != 0)> ERROR_##msg; (void)ERROR_##msg; } 


////////////////////////////////////////////////////////////////////////////////
// Change log:
// March 20, 2001: add extra parens to STATIC_CHECK - it looked like a fun 
//     definition
// June 20, 2001: ported by Nick Thurn to gcc 2.95.3. Kudos, Nick!!!
////////////////////////////////////////////////////////////////////////////////

#endif // STATIC_CHECK_INC_

---