62 lines
3.2 KiB
C++
62 lines
3.2 KiB
C++
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// Copyright David Abrahams 2005. 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_DETAIL_IS_XXX_DWA20051011_HPP
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# define BOOST_DETAIL_IS_XXX_DWA20051011_HPP
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# include <boost/config.hpp>
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# include <boost/mpl/bool.hpp>
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# include <boost/preprocessor/enum_params.hpp>
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# if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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# include <boost/type_traits/is_reference.hpp>
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# include <boost/type_traits/add_reference.hpp>
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# define BOOST_DETAIL_IS_XXX_DEF(name, qualified_name, nargs) \
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template <class X_> \
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struct is_##name \
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{ \
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typedef char yes; \
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typedef char (&no)[2]; \
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\
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static typename add_reference<X_>::type dummy; \
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\
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struct helpers \
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{ \
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template < BOOST_PP_ENUM_PARAMS_Z(1, nargs, class U) > \
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static yes test( \
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qualified_name< BOOST_PP_ENUM_PARAMS_Z(1, nargs, U) >&, int \
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); \
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\
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template <class U> \
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static no test(U&, ...); \
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}; \
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\
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BOOST_STATIC_CONSTANT( \
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bool, value \
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= !is_reference<X_>::value \
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& (sizeof(helpers::test(dummy, 0)) == sizeof(yes))); \
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\
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typedef mpl::bool_<value> type; \
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};
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# else
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# define BOOST_DETAIL_IS_XXX_DEF(name, qualified_name, nargs) \
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template <class T> \
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struct is_##name : mpl::false_ \
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{ \
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}; \
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\
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template < BOOST_PP_ENUM_PARAMS_Z(1, nargs, class T) > \
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struct is_##name< \
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qualified_name< BOOST_PP_ENUM_PARAMS_Z(1, nargs, T) > \
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> \
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: mpl::true_ \
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{ \
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};
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# endif
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#endif // BOOST_DETAIL_IS_XXX_DWA20051011_HPP
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