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