static_check.h

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// 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 
//     purpose is hereby granted without fee, provided that the above copyright 
//     notice appear in all copies and that both that copyright notice and this 
//     permission notice appear in supporting documentation.
// The author or Addison-Wesley Longman make no representations about the 
//     suitability of this software for any purpose. It is provided "as is" 
//     without express or implied warranty.
#ifndef LOKI_STATIC_CHECK_INC_
#define LOKI_STATIC_CHECK_INC_

// $Id: static_check.h 982 2009-01-31 07:51:27Z rich_sposato $


namespace Loki
{
// Helper structure for the STATIC_CHECK macro

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

// macro LOKI_STATIC_CHECK
// Invocation: LOKI_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 LOKI_STATIC_CHECK(expr, msg) \
    { Loki::CompileTimeError<((expr) != 0)> ERROR_##msg; (void)ERROR_##msg; } 


#endif // end file guardian