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Dave Abrahams
ac6415fac2
macro is better than simply defining a destructor because usage patterns will be tested whenever associated types are accessed. [SVN r35198]
33 lines
845 B
C++
Executable File
33 lines
845 B
C++
Executable File
// Copyright David Abrahams 2006. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_CONCEPT_USAGE_DWA2006919_HPP
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# define BOOST_CONCEPT_USAGE_DWA2006919_HPP
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# include <boost/concept/assert.hpp>
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# include <boost/detail/workaround.hpp>
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namespace boost { namespace concept {
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# if BOOST_WORKAROUND(__GNUC__, == 2)
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# define BOOST_CONCEPT_USAGE(model) ~model()
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# else
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template <class Model>
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struct usage_requirements
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{
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~usage_requirements() { ((Model*)0)->~Model(); }
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};
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# define BOOST_CONCEPT_USAGE(model) \
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BOOST_CONCEPT_ASSERT((boost::concept::usage_requirements<model>)); \
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~model()
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# endif
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}} // namespace boost::concept
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#endif // BOOST_CONCEPT_USAGE_DWA2006919_HPP
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