61 lines
2.4 KiB
C
61 lines
2.4 KiB
C
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////////////////////////////////////////////////////////////////////////////////
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// The Loki Library
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// Copyright (c) 2001 by Andrei Alexandrescu
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// This code accompanies the book:
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// Alexandrescu, Andrei. "Modern C++ Design: Generic Programming and Design
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// Patterns Applied". Copyright (c) 2001. Addison-Wesley.
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// Permission to use, copy, modify, distribute and sell this software for any
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// purpose is hereby granted without fee, provided that the above copyright
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// notice appear in all copies and that both that copyright notice and this
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// permission notice appear in supporting documentation.
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// The author or Addison-Wesley Longman make no representations about the
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// suitability of this software for any purpose. It is provided "as is"
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// without express or implied warranty.
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////////////////////////////////////////////////////////////////////////////////
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// Last update: August 9, 2002
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#ifndef STATIC_CHECK_INC_
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#define STATIC_CHECK_INC_
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namespace Loki
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{
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////////////////////////////////////////////////////////////////////////////////
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// Helper structure for the STATIC_CHECK macro
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////////////////////////////////////////////////////////////////////////////////
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template<int> struct CompileTimeError;
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template<> struct CompileTimeError<true> {};
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}
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////////////////////////////////////////////////////////////////////////////////
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// macro STATIC_CHECK
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// Invocation: STATIC_CHECK(expr, id)
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// where:
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// expr is a compile-time integral or pointer expression
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// id is a C++ identifier that does not need to be defined
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// If expr is zero, id will appear in a compile-time error message.
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////////////////////////////////////////////////////////////////////////////////
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template<bool>
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struct CompileTimeChecker
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{
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CompileTimeChecker(...);
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};
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template<> struct CompileTimeChecker<false> {};
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#define STATIC_CHECK(expr, msg)\
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{\
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class ERROR_##msg {}; \
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(void)sizeof(CompileTimeChecker<(expr)>(ERROR_##msg()));\
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}
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////////////////////////////////////////////////////////////////////////////////
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// Change log:
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// March 20, 2001: add extra parens to STATIC_CHECK - it looked like a fun
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// definition
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// June 20, 2001: ported by Nick Thurn to gcc 2.95.3. Kudos, Nick!!!
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// July 16, 2002: Ported by Terje Sletteb<65> and Pavel Vozenilek to BCC 5.6
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////////////////////////////////////////////////////////////////////////////////
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#endif // STATIC_CHECK_INC_
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