cartobase
5.0.5
conversion.h
Go to the documentation of this file.
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/* This software and supporting documentation are distributed by
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* Institut Federatif de Recherche 49
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* 91191 Gif-sur-Yvette cedex
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* France
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*
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* This software is governed by the CeCILL-B license under
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* French law and abiding by the rules of distribution of free software.
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* You can use, modify and/or redistribute the software under the
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* terms of the CeCILL-B license as circulated by CEA, CNRS
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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-Welsey 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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#ifndef CARTOBASE_TYPE_CONVERSION_H
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#define CARTOBASE_TYPE_CONVERSION_H
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#include <
cartobase/config/cartobase_config.h
>
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namespace
carto
{
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template
<
typename
T,
typename
U>
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class
conversion
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{
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template
<
typename
V,
typename
W>
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struct
Helper
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{
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typedef
char
no;
// sizeof(no) == 1
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struct
yes
{
char
dummy
[2]; };
// sizeof(yes) >= 2
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static
no test( ... );
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static
yes
test( W* );
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};
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typedef
Helper<T, U> H;
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public
:
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enum
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{
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exists
=
sizeof
(
typename
H::yes
) ==
sizeof
( H::test( static_cast<T*>(0) ) )
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};
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};
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}
// namespace carto
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#define SUPERSUBCLASS( T, U ) \
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( static_cast<bool>(::carto::conversion<const U, const T>::exists) )
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#define SUPERSUBCLASS_NONCONST( T, U ) \
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( static_cast<bool>(::carto::conversion<U, T>::exists) )
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#endif
carto::conversion::Helper::yes::dummy
char dummy[2]
Definition:
conversion.h:67
carto::conversion
Definition:
conversion.h:60
carto::conversion::Helper::yes
Definition:
conversion.h:67
carto
Definition:
algorithm.h:48
carto::conversion::exists
Definition:
conversion.h:77
cartobase_config.h
cartobase
type
conversion.h
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