text: #ifndef BOOST_TYPE_TRAITS_DETAIL_COMPOSITE_MEMBER_POINTER_TYPE_HPP_INCLUDED
  #define BOOST_TYPE_TRAITS_DETAIL_COMPOSITE_MEMBER_POINTER_TYPE_HPP_INCLUDED
  
  //
  //  Copyright 2015 Peter Dimov
  //
  //  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
  //
  
  #include <boost/type_traits/detail/composite_pointer_type.hpp>
  #include <boost/type_traits/remove_pointer.hpp>
  #include <boost/type_traits/is_base_of.hpp>
  #include <boost/type_traits/conditional.hpp>
  #include <boost/config.hpp>
  #include <cstddef>
  
  namespace lslboost
  {
  
  namespace type_traits_detail
  {
  
  template<class T, class U> struct composite_member_pointer_type;
  
  // nullptr_t
  
  #if !defined( BOOST_NO_CXX11_NULLPTR )
  
  #if !defined( BOOST_NO_CXX11_DECLTYPE ) && ( ( defined( __clang__ ) && !defined( _LIBCPP_VERSION ) ) || defined( __INTEL_COMPILER ) )
  
  template<class C, class T> struct composite_member_pointer_type<T C::*, decltype(nullptr)>
  {
      typedef T C::* type;
  };
  
  template<class C, class T> struct composite_member_pointer_type<decltype(nullptr), T C::*>
  {
      typedef T C::* type;
  };
  
  template<> struct composite_member_pointer_type<decltype(nullptr), decltype(nullptr)>
  {
      typedef decltype(nullptr) type;
  };
  
  #else
  
  template<class C, class T> struct composite_member_pointer_type<T C::*, std::nullptr_t>
  {
      typedef T C::* type;
  };
  
  template<class C, class T> struct composite_member_pointer_type<std::nullptr_t, T C::*>
  {
      typedef T C::* type;
  };
  
  template<> struct composite_member_pointer_type<std::nullptr_t, std::nullptr_t>
  {
      typedef std::nullptr_t type;
  };
  
  #endif
  
  #endif // !defined( BOOST_NO_CXX11_NULLPTR )
  
  template<class C1, class C2> struct common_member_class;
  
  template<class C> struct common_member_class<C, C>
  {
      typedef C type;
  };
  
  template<class C1, class C2> struct common_member_class
  {
      typedef typename lslboost::conditional<
  
          lslboost::is_base_of<C1, C2>::value,
          C2,
          typename lslboost::conditional<lslboost::is_base_of<C2, C1>::value, C1, void>::type
  
      >::type type;
  };
  
  //This indirection avoids compilation errors on some older 
  //compilers like MSVC 7.1
  template<class CT, class CB>
  struct common_member_class_pointer_to_member
  {
      typedef CT CB::* type;
  };
  
  template<class C1, class T1, class C2, class T2> struct composite_member_pointer_type<T1 C1::*, T2 C2::*>
  {
  private:
  
      typedef typename composite_pointer_type<T1*, T2*>::type CPT;
      typedef typename lslboost::remove_pointer<CPT>::type CT;
  
      typedef typename common_member_class<C1, C2>::type CB;
  
  public:
  
      typedef typename common_member_class_pointer_to_member<CT, CB>::type type;
  };
  
  } // namespace type_traits_detail
  
  } // namespace lslboost
  
  #endif // #ifndef BOOST_TYPE_TRAITS_DETAIL_COMPOSITE_MEMBER_POINTER_TYPE_HPP_INCLUDED
  