// Copyright Daniel Wallin 2006.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_PARAMETER_AUX_PP_IMPL_UNWRAP_PREDICATE_HPP
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#define BOOST_PARAMETER_AUX_PP_IMPL_UNWRAP_PREDICATE_HPP
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namespace boost { namespace parameter { namespace aux {
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// Given Match, which is "void x" where x is an argument matching
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// criterion, extract a corresponding MPL predicate.
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template <typename Match>
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struct unwrap_predicate;
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}}} // namespace boost::parameter::aux
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#include <boost/parameter/aux_/always_true_predicate.hpp>
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namespace boost { namespace parameter { namespace aux {
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// Match anything
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template <>
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struct unwrap_predicate<void*>
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{
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typedef ::boost::parameter::aux::always_true_predicate type;
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};
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}}} // namespace boost::parameter::aux
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#include <boost/parameter/config.hpp>
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#if BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x580))
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#include <boost/parameter/aux_/void.hpp>
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#endif
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namespace boost { namespace parameter { namespace aux {
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// A matching predicate is explicitly specified.
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#if BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x580))
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template <typename Predicate>
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struct unwrap_predicate< ::boost::parameter::aux::voidstar(Predicate)>
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{
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typedef Predicate type;
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};
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#else
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template <typename Predicate>
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struct unwrap_predicate<void *(Predicate)>
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{
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typedef Predicate type;
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};
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#endif // SunProCC workarounds needed.
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}}} // namespace boost::parameter::aux
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/if.hpp>
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#if defined(BOOST_PARAMETER_CAN_USE_MP11)
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#include <type_traits>
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#else
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#include <boost/mpl/placeholders.hpp>
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#include <boost/type_traits/is_convertible.hpp>
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#endif
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namespace boost { namespace parameter { namespace aux {
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// A type to which the argument is supposed to be convertible is
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// specified.
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template <typename Target>
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struct unwrap_predicate<void (Target)>
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{
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#if defined(BOOST_PARAMETER_CAN_USE_MP11)
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struct type
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{
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template <typename Argument, typename ArgumentPack>
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struct apply
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: ::boost::mpl::if_<
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::std::is_convertible<Argument,Target>
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, ::boost::mpl::true_
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, ::boost::mpl::false_
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>
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{
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};
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template <typename Argument, typename ArgumentPack>
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using fn = ::std::is_convertible<Argument,Target>;
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};
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#else
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typedef ::boost::mpl::if_<
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::boost::is_convertible< ::boost::mpl::_,Target>
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, ::boost::mpl::true_
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, ::boost::mpl::false_
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> type;
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#endif // BOOST_PARAMETER_CAN_USE_MP11
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};
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}}} // namespace boost::parameter::aux
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#endif // include guard
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