StaticAssert.h

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/*
 * Expression Template Matrix Library
 *
 * Copyright (C) 2004 - 2006 Ricky Lung <mtlung@users.sourceforge.net>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */


#ifdef _MSC_VER
#pragma once
#endif  // _MSC_VER

#ifndef _EXMAT_STATICASSERT_H
#define _EXMAT_STATICASSERT_H

#include "loki/static_check.h"

namespace exmat {

#ifdef EXMAT_GNUC
/************************************************/
// Compile time Assertion
template<bool> struct CompileTimeChecker {
    CompileTimeChecker(...);
};
template<> struct CompileTimeChecker<false> {};
#define StaticAssert(expr, msg) \
    struct ERROR_##msg { ERROR_##msg(){}; };    \
    (void)sizeof(CompileTimeChecker<((expr) != 0)>(ERROR_##msg()))

template<class chk> struct ERROR_dummy{};
// StaticAssert1 can be used anywhere, including class definition
#define StaticAssert1(expr, msg)    \
    struct ERROR_##msg { ERROR_##msg(){}; };    \
    typedef ERROR_dummy<CompileTimeChecker<((expr) != 0)>(ERROR_##msg())> DummyTypedef;

};
#else

template<bool> struct CompileTimeChecker {
    CompileTimeChecker(...);
};
template<> struct CompileTimeChecker<false> {};
#define StaticAssert(expr, msg) \
    struct ERROR_##msg { ERROR_##msg(){}; };    \
    (void)sizeof(CompileTimeChecker<((expr) != 0)>(ERROR_##msg()))

template<int chk> struct ERROR_dummy{};
// StaticAssert1 can be used anywhere, including class definition
#define StaticAssert1(expr, msg)    \
    struct ERROR_##msg { ERROR_##msg(){}; };    \
    typedef ERROR_dummy<sizeof(CompileTimeChecker<((expr) != 0)>(ERROR_##msg()))> DummyTypedef;

};
#endif

#endif  // _EXMAT_STATICASSERT_H

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