61 lines
2.0 KiB
Plaintext
61 lines
2.0 KiB
Plaintext
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// (C) Copyright Tobias Schwinger
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//
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// Use modification and distribution are subject to the boost Software License,
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// Version 1.0. (See http://www.boost.org/LICENSE_1_0.txt).
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//------------------------------------------------------------------------------
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#ifndef BOOST_FT_DETAIL_CLASS_TRANSFORM_HPP_INCLUDED
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#define BOOST_FT_DETAIL_CLASS_TRANSFORM_HPP_INCLUDED
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#include <boost/mpl/apply.hpp>
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#include <boost/mpl/always.hpp>
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#include <boost/mpl/identity.hpp>
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#include <boost/mpl/placeholders.hpp>
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#include <boost/type_traits/remove_cv.hpp>
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#include <boost/type_traits/add_pointer.hpp>
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#include <boost/type_traits/add_reference.hpp>
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namespace boost { namespace function_types { namespace detail {
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using mpl::placeholders::_;
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// Transformation metafunction for the class type of member function pointers.
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template<typename T, typename L>
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struct class_transform
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{ typedef typename mpl::apply1<L,T>::type type; };
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// We can short-circuit the mechanism implemented in the primary template for
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// the most common lambda expression and save both the "un-lambdaing" and the
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// type traits invocation (we know that T can only be a class type).
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template<typename T> struct class_transform< T, mpl::identity<_> >
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{ typedef T type; };
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template<typename T> struct class_transform< T, add_reference<_> >
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{ typedef T & type; };
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template<typename T> struct class_transform< T, add_pointer<_> >
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{ typedef T * type; };
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template<typename T> struct class_transform< T, remove_cv<_> >
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{ typedef typename boost::remove_cv<T>::type type; };
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template<typename T> struct class_transform< T, add_reference< remove_cv<_> > >
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{ typedef typename boost::remove_cv<T>::type & type; };
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template<typename T> struct class_transform< T, add_pointer< remove_cv<_> > >
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{ typedef typename boost::remove_cv<T>::type * type; };
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template<typename T, typename U> struct class_transform< T, mpl::always<U> >
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{ typedef U type; };
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} } } // namespace ::boost::function_types::detail
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#endif
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