54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
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/*
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TRAIT-SPECIAL.hpp - supplement, not so commonly used definitions and specialisations
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Copyright (C) Lumiera.org
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2010, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef LIB_META_TRAIT_SPECIAL_H
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#define LIB_META_TRAIT_SPECIAL_H
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#include "lib/meta/trait.hpp"
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#include <tr1/unordered_map>
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namespace lib {
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namespace meta {
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/** the tr1 hashtable(s) are notoriously difficult to handle
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* when it comes to detecting capabilities by metaprogramming,
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* because the're built up from a generic baseclass and especially
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* inherit their iterator-types as template specialisations.
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*
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* Thus we provide fixed diagnostics to bypass the traits check.
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*/
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template<typename KEY, typename VAL, typename HASH>
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struct can_STL_ForEach<std::tr1::unordered_map<KEY,VAL,HASH> >
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{
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enum { value = true };
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};
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}} // namespace lib::meta
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#endif
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