--- /dev/null
+/* Copyright 2003-2006 Joaquín M López Muñoz.
+ * 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)
+ *
+ * See http://www.boost.org/libs/multi_index for library home page.
+ */
+
+#ifndef BOOST_MULTI_INDEX_MEMBER_HPP
+#define BOOST_MULTI_INDEX_MEMBER_HPP
+
+#if defined(_MSC_VER)&&(_MSC_VER>=1200)
+#pragma once
+#endif
+
+#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
+#include <boost/mpl/if.hpp>
+#include <boost/type_traits/is_const.hpp>
+#include <boost/utility/enable_if.hpp>
+#include <cstddef>
+
+#if !defined(BOOST_NO_SFINAE)
+#include <boost/type_traits/is_convertible.hpp>
+#endif
+
+namespace boost{
+
+template<class T> class reference_wrapper; /* fwd decl. */
+
+namespace multi_index{
+
+namespace detail{
+
+/* member is a read/write key extractor for accessing a given
+ * member of a class.
+ * Additionally, member is overloaded to support referece_wrappers
+ * of T and "chained pointers" to T's. By chained pointer to T we mean
+ * a type P such that, given a p of Type P
+ * *...n...*x is convertible to T&, for some n>=1.
+ * Examples of chained pointers are raw and smart pointers, iterators and
+ * arbitrary combinations of these (vg. T** or auto_ptr<T*>.)
+ */
+
+/* NB. Some overloads of operator() have an extra dummy parameter int=0.
+ * This disambiguator serves several purposes:
+ * - Without it, MSVC++ 6.0 incorrectly regards some overloads as
+ * specializations of a previous member function template.
+ * - MSVC++ 6.0/7.0 seem to incorrectly treat some different memfuns
+ * as if they have the same signature.
+ * - If remove_const is broken due to lack of PTS, int=0 avoids the
+ * declaration of memfuns with identical signature.
+ */
+
+template<class Class,typename Type,Type Class::*PtrToMember>
+struct const_member_base
+{
+ typedef Type result_type;
+
+ template<typename ChainedPtr>
+
+#if !defined(BOOST_NO_SFINAE)
+ typename disable_if<
+ is_convertible<const ChainedPtr&,const Class&>,Type&>::type
+#else
+ Type&
+#endif
+
+ operator()(const ChainedPtr& x)const
+ {
+ return operator()(*x);
+ }
+
+ Type& operator()(const Class& x)const
+ {
+ return x.*PtrToMember;
+ }
+
+ Type& operator()(const reference_wrapper<const Class>& x)const
+ {
+ return operator()(x.get());
+ }
+
+ Type& operator()(const reference_wrapper<Class>& x,int=0)const
+ {
+ return operator()(x.get());
+ }
+};
+
+template<class Class,typename Type,Type Class::*PtrToMember>
+struct non_const_member_base
+{
+ typedef Type result_type;
+
+ template<typename ChainedPtr>
+
+#if !defined(BOOST_NO_SFINAE)
+ typename disable_if<
+ is_convertible<const ChainedPtr&,const Class&>,Type&>::type
+#else
+ Type&
+#endif
+
+ operator()(const ChainedPtr& x)const
+ {
+ return operator()(*x);
+ }
+
+ const Type& operator()(const Class& x,int=0)const
+ {
+ return x.*PtrToMember;
+ }
+
+ Type& operator()(Class& x)const
+ {
+ return x.*PtrToMember;
+ }
+
+ const Type& operator()(const reference_wrapper<const Class>& x,int=0)const
+ {
+ return operator()(x.get());
+ }
+
+ Type& operator()(const reference_wrapper<Class>& x)const
+ {
+ return operator()(x.get());
+ }
+};
+
+} /* namespace multi_index::detail */
+
+template<class Class,typename Type,Type Class::*PtrToMember>
+struct member:
+ mpl::if_c<
+ is_const<Type>::value,
+ detail::const_member_base<Class,Type,PtrToMember>,
+ detail::non_const_member_base<Class,Type,PtrToMember>
+ >::type
+{
+};
+
+namespace detail{
+
+/* MSVC++ 6.0 does not support properly pointers to members as
+ * non-type template arguments, as reported in
+ * http://support.microsoft.com/default.aspx?scid=kb;EN-US;249045
+ * A similar problem (though not identical) is shown by MSVC++ 7.0.
+ * We provide an alternative to member<> accepting offsets instead
+ * of pointers to members. This happens to work even for non-POD
+ * types (although the standard forbids use of offsetof on these),
+ * so it serves as a workaround in this compiler for all practical
+ * purposes.
+ * Surprisingly enough, other compilers, like Intel C++ 7.0/7.1 and
+ * Visual Age 6.0, have similar bugs. This replacement of member<>
+ * can be used for them too.
+ */
+
+template<class Class,typename Type,std::size_t OffsetOfMember>
+struct const_member_offset_base
+{
+ typedef Type result_type;
+
+ template<typename ChainedPtr>
+
+#if !defined(BOOST_NO_SFINAE)
+ typename disable_if<
+ is_convertible<const ChainedPtr&,const Class&>,Type&>::type
+#else
+ Type&
+#endif
+
+ operator()(const ChainedPtr& x)const
+ {
+ return operator()(*x);
+ }
+
+ Type& operator()(const Class& x)const
+ {
+ return *static_cast<const Type*>(
+ static_cast<const void*>(
+ static_cast<const char*>(
+ static_cast<const void *>(&x))+OffsetOfMember));
+ }
+
+ Type& operator()(const reference_wrapper<const Class>& x)const
+ {
+ return operator()(x.get());
+ }
+
+ Type& operator()(const reference_wrapper<Class>& x,int=0)const
+ {
+ return operator()(x.get());
+ }
+};
+
+template<class Class,typename Type,std::size_t OffsetOfMember>
+struct non_const_member_offset_base
+{
+ typedef Type result_type;
+
+ template<typename ChainedPtr>
+
+#if !defined(BOOST_NO_SFINAE)
+ typename disable_if<
+ is_convertible<const ChainedPtr&,const Class&>,Type&>::type
+#else
+ Type&
+#endif
+
+ operator()(const ChainedPtr& x)const
+ {
+ return operator()(*x);
+ }
+
+ const Type& operator()(const Class& x,int=0)const
+ {
+ return *static_cast<const Type*>(
+ static_cast<const void*>(
+ static_cast<const char*>(
+ static_cast<const void *>(&x))+OffsetOfMember));
+ }
+
+ Type& operator()(Class& x)const
+ {
+ return *static_cast<Type*>(
+ static_cast<void*>(
+ static_cast<char*>(static_cast<void *>(&x))+OffsetOfMember));
+ }
+
+ const Type& operator()(const reference_wrapper<const Class>& x,int=0)const
+ {
+ return operator()(x.get());
+ }
+
+ Type& operator()(const reference_wrapper<Class>& x)const
+ {
+ return operator()(x.get());
+ }
+};
+
+} /* namespace multi_index::detail */
+
+template<class Class,typename Type,std::size_t OffsetOfMember>
+struct member_offset:
+ mpl::if_c<
+ is_const<Type>::value,
+ detail::const_member_offset_base<Class,Type,OffsetOfMember>,
+ detail::non_const_member_offset_base<Class,Type,OffsetOfMember>
+ >::type
+{
+};
+
+/* BOOST_MULTI_INDEX_MEMBER resolves to member in the normal cases,
+ * and to member_offset as a workaround in those defective compilers for
+ * which BOOST_NO_POINTER_TO_MEMBER_TEMPLATE_PARAMETERS is defined.
+ */
+
+#if defined(BOOST_NO_POINTER_TO_MEMBER_TEMPLATE_PARAMETERS)
+#define BOOST_MULTI_INDEX_MEMBER(Class,Type,MemberName) \
+::boost::multi_index::member_offset< Class,Type,offsetof(Class,MemberName) >
+#else
+#define BOOST_MULTI_INDEX_MEMBER(Class,Type,MemberName) \
+::boost::multi_index::member< Class,Type,&Class::MemberName >
+#endif
+
+} /* namespace multi_index */
+
+} /* namespace boost */
+
+#endif
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