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/************************************************************************/
/* */
/* Copyright 2004-2005 by Ullrich Koethe */
/* Cognitive Systems Group, University of Hamburg, Germany */
/* */
/* This file is part of the VIGRA computer vision library. */
/* ( Version 1.6.0, Aug 13 2008 ) */
/* The VIGRA Website is */
/* http://kogs-www.informatik.uni-hamburg.de/~koethe/vigra/ */
/* Please direct questions, bug reports, and contributions to */
/* ullrich.koethe@iwr.uni-heidelberg.de or */
/* vigra@informatik.uni-hamburg.de */
/* */
/* Permission is hereby granted, free of charge, to any person */
/* obtaining a copy of this software and associated documentation */
/* files (the "Software"), to deal in the Software without */
/* restriction, including without limitation the rights to use, */
/* copy, modify, merge, publish, distribute, sublicense, and/or */
/* sell copies of the Software, and to permit persons to whom the */
/* Software is furnished to do so, subject to the following */
/* conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the */
/* Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES */
/* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND */
/* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT */
/* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, */
/* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING */
/* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR */
/* OTHER DEALINGS IN THE SOFTWARE. */
/* */
/************************************************************************/
#ifndef VIGRA_STATIC_ASSERT_HXX
#define VIGRA_STATIC_ASSERT_HXX
// based on the static assertion design in boost::mpl (see www.boost.org)
#define VIGRA_PREPROCESSOR_CONCATENATE(a, b) VIGRA_PREPROCESSOR_CONCATENATE_IMPL(a, b)
#define VIGRA_PREPROCESSOR_CONCATENATE_IMPL(a, b) a ## b
namespace vigra {
namespace staticAssert {
template <bool Predicate>
struct AssertBool;
template <>
struct AssertBool<true>
{
typedef int type;
typedef void * not_type;
};
template <>
struct AssertBool<false>
{
typedef void * type;
typedef int not_type;
};
template <class T>
struct Assert;
template <>
struct Assert<VigraTrueType>
{
typedef int type;
typedef void * not_type;
};
template <>
struct Assert<VigraFalseType>
{
typedef void * type;
typedef int not_type;
};
struct failure{};
struct success {};
inline int check( success ) { return 0; }
template< typename Predicate >
failure ************ (Predicate::************
assertImpl( void (*)(Predicate), typename Predicate::not_type )
);
template< typename Predicate >
success
assertImpl( void (*)(Predicate), typename Predicate::type );
/* Usage:
1. Define an assertion class, derived from vigra::staticAssert::Assert,
whose name serves as an error message:
template <int N>
struct FixedPoint_overflow_error__More_than_31_bits_requested
: vigra::staticAssert::AssertBool<(N < 32)>
{};
2. Call VIGRA_STATIC_ASSERT() with the assertion class:
template <int N>
void test()
{
// signal error if N > 31
VIGRA_STATIC_ASSERT((FixedPoint_overflow_error__More_than_31_bits_requested<N>));
}
TODO: provide more assertion base classes for other (non boolean) types of tests
*/
#if !defined(__GNUC__) || __GNUC__ > 2
#define VIGRA_STATIC_ASSERT(Predicate) \
enum { \
VIGRA_PREPROCESSOR_CONCATENATE(vigra_assertion_in_line_, __LINE__) = sizeof( \
staticAssert::check( \
staticAssert::assertImpl( (void (*) Predicate)0, 1 ) \
) \
) \
}
#else
#define VIGRA_STATIC_ASSERT(Predicate)
#endif
} // namespace staticAssert
} // namespace vigra
#endif // VIGRA_STATIC_ASSERT_HXX
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