is_convertible.h

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/** @file
 *  @author Bram de Greve (bram@cocamware.com)
 *  @author Tom De Muer (tom@cocamware.com)
 *
 *  *** BEGIN LICENSE INFORMATION ***
 *  
 *  The contents of this file are subject to the Common Public Attribution License 
 *  Version 1.0 (the "License"); you may not use this file except in compliance with 
 *  the License. You may obtain a copy of the License at 
 *  http://lass.sourceforge.net/cpal-license. The License is based on the 
 *  Mozilla Public License Version 1.1 but Sections 14 and 15 have been added to cover 
 *  use of software over a computer network and provide for limited attribution for 
 *  the Original Developer. In addition, Exhibit A has been modified to be consistent 
 *  with Exhibit B.
 *  
 *  Software distributed under the License is distributed on an "AS IS" basis, WITHOUT 
 *  WARRANTY OF ANY KIND, either express or implied. See the License for the specific 
 *  language governing rights and limitations under the License.
 *  
 *  The Original Code is LASS - Library of Assembled Shared Sources.
 *  
 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
 *  The Original Developer is the Initial Developer.
 *  
 *  All portions of the code written by the Initial Developer are:
 *  Copyright (C) 2004-2011 the Initial Developer.
 *  All Rights Reserved.
 *  
 *  Contributor(s):
 *
 *  Alternatively, the contents of this file may be used under the terms of the 
 *  GNU General Public License Version 2 or later (the GPL), in which case the 
 *  provisions of GPL are applicable instead of those above.  If you wish to allow use
 *  of your version of this file only under the terms of the GPL and not to allow 
 *  others to use your version of this file under the CPAL, indicate your decision by 
 *  deleting the provisions above and replace them with the notice and other 
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 *  
 *  *** END LICENSE INFORMATION ***
 */
 
#ifndef LASS_GUARDIAN_OF_INCLUSION_META_IS_CONVERTIBLE_H
#define LASS_GUARDIAN_OF_INCLUSION_META_IS_CONVERTIBLE_H
 
#include "meta_common.h"
#include "bool.h"
 
#if LASS_COMPILER_TYPE == LASS_COMPILER_TYPE_MSVC
#   pragma warning(push)
#   pragma warning(disable: 4244) // conversion from 'foo' to 'bar': possible loss of data
#endif
 
namespace lass
{
namespace meta
{
namespace impl
{
    template <typename Src, typename Dest> struct ConvTest
    {
        static Src dut(); // device under test =)
        static meta::True lassMetaImplConvTestFunc(Dest); // big ugly name to avoid weird name clash with Visual Studio 2010. Creepy!
        static meta::False lassMetaImplConvTestFunc(...);
        enum { value = sizeof(lassMetaImplConvTestFunc(dut())) == sizeof(True) };
        typedef typename meta::Bool<value>::Type Type;
    };
}
 
template 
<
    typename Src,
    typename Dest
>
struct IsConvertible: public impl::ConvTest<Src, Dest>::Type
{
};
 
}
}
 
#if LASS_COMPILER_TYPE == LASS_COMPILER_TYPE_MSVC
#   pragma warning(pop)
#endif
 
#endif
 
// EOF