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https://github.com/PurpleI2P/Boost-for-Android-Prebuilt
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133 lines
3.5 KiB
C++
133 lines
3.5 KiB
C++
// Copyright David Abrahams, Daniel Wallin 2003.
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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_DEDUCED_HPP
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#define BOOST_PARAMETER_DEDUCED_HPP
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#include <boost/parameter/aux_/use_default.hpp>
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namespace boost { namespace parameter {
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// This metafunction can be used to describe the treatment of particular
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// named parameters for the purposes of overload elimination with SFINAE,
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// by placing specializations in the parameters<...> list.
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//
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// If a keyword k is specified with deduced<...>, that keyword
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// will be automatically deduced from the argument list.
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template <typename Tag>
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struct deduced
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{
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typedef Tag key_type;
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};
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}}
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#include <boost/parameter/config.hpp>
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#if defined(BOOST_PARAMETER_CAN_USE_MP11)
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#include <boost/mp11/integral.hpp>
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#else
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#include <boost/mpl/bool.hpp>
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#endif
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namespace boost { namespace parameter { namespace aux {
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template <typename T>
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struct is_deduced_aux
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#if defined(BOOST_PARAMETER_CAN_USE_MP11)
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: ::boost::mp11::mp_false
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#else
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: ::boost::mpl::false_
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#endif
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{
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};
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template <typename Tag>
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struct is_deduced_aux< ::boost::parameter::deduced<Tag> >
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#if defined(BOOST_PARAMETER_CAN_USE_MP11)
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: ::boost::mp11::mp_true
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#else
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: ::boost::mpl::true_
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#endif
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{
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};
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template <typename T>
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struct is_deduced0
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: ::boost::parameter::aux::is_deduced_aux<typename T::key_type>::type
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{
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};
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}}} // namespace boost::parameter::aux
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#include <boost/parameter/required.hpp>
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#include <boost/parameter/optional.hpp>
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#if defined(BOOST_PARAMETER_CAN_USE_MP11)
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#include <boost/mp11/utility.hpp>
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#else
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#include <boost/mpl/if.hpp>
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#endif
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namespace boost { namespace parameter { namespace aux {
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//
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// tag_type, has_default, and predicate --
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//
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// These metafunctions accept a ParameterSpec and extract the
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// keyword tag, whether or not a default is supplied for the
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// parameter, and the predicate that the corresponding actual
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// argument type is required match.
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//
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// a ParameterSpec is a specialization of either keyword<...>,
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// required<...>, optional<...>
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//
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template <typename T>
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#if defined(BOOST_PARAMETER_CAN_USE_MP11)
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using has_default = ::boost::mp11::mp_if<
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::boost::parameter::aux::is_required<T>
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, ::boost::mp11::mp_false
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, ::boost::mp11::mp_true
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>;
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#else
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struct has_default
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: ::boost::mpl::if_<
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::boost::parameter::aux::is_required<T>
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, ::boost::mpl::false_
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, ::boost::mpl::true_
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>::type
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{
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};
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#endif
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template <typename T>
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#if defined(BOOST_PARAMETER_CAN_USE_MP11)
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using is_deduced = ::boost::mp11::mp_if<
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::boost::mp11::mp_if<
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::boost::parameter::aux::is_optional<T>
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, ::boost::mp11::mp_true
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, ::boost::parameter::aux::is_required<T>
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>
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, ::boost::parameter::aux::is_deduced0<T>
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, ::boost::mp11::mp_false
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>;
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#else
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struct is_deduced
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: ::boost::mpl::if_<
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typename ::boost::mpl::if_<
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::boost::parameter::aux::is_optional<T>
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, ::boost::mpl::true_
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, ::boost::parameter::aux::is_required<T>
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>::type
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, ::boost::parameter::aux::is_deduced0<T>
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, ::boost::mpl::false_
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>::type
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{
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};
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#endif // BOOST_PARAMETER_CAN_USE_MP11
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}}} // namespace boost::parameter::aux
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#endif // include guard
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