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269 lines
6.7 KiB
269 lines
6.7 KiB
/* Copyright 2003-2008 Joaquin M Lopez Munoz. |
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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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* |
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* See http://www.boost.org/libs/multi_index for library home page. |
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*/ |
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#ifndef BOOST_MULTI_INDEX_MEMBER_HPP |
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#define BOOST_MULTI_INDEX_MEMBER_HPP |
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#if defined(_MSC_VER)&&(_MSC_VER>=1200) |
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#pragma once |
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#endif |
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#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */ |
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#include <boost/mpl/if.hpp> |
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#include <boost/type_traits/is_const.hpp> |
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#include <boost/utility/enable_if.hpp> |
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#include <cstddef> |
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#if !defined(BOOST_NO_SFINAE) |
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#include <boost/type_traits/is_convertible.hpp> |
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#endif |
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namespace boost{ |
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template<class T> class reference_wrapper; /* fwd decl. */ |
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namespace multi_index{ |
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namespace detail{ |
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/* member is a read/write key extractor for accessing a given |
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* member of a class. |
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* Additionally, member is overloaded to support referece_wrappers |
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* of T and "chained pointers" to T's. By chained pointer to T we mean |
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* a type P such that, given a p of Type P |
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* *...n...*x is convertible to T&, for some n>=1. |
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* Examples of chained pointers are raw and smart pointers, iterators and |
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* arbitrary combinations of these (vg. T** or auto_ptr<T*>.) |
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*/ |
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/* NB. Some overloads of operator() have an extra dummy parameter int=0. |
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* This disambiguator serves several purposes: |
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* - Without it, MSVC++ 6.0 incorrectly regards some overloads as |
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* specializations of a previous member function template. |
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* - MSVC++ 6.0/7.0 seem to incorrectly treat some different memfuns |
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* as if they have the same signature. |
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* - If remove_const is broken due to lack of PTS, int=0 avoids the |
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* declaration of memfuns with identical signature. |
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*/ |
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template<class Class,typename Type,Type Class::*PtrToMember> |
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struct const_member_base |
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{ |
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typedef Type result_type; |
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template<typename ChainedPtr> |
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#if !defined(BOOST_NO_SFINAE) |
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typename disable_if< |
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is_convertible<const ChainedPtr&,const Class&>,Type&>::type |
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#else |
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Type& |
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#endif |
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operator()(const ChainedPtr& x)const |
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{ |
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return operator()(*x); |
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} |
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Type& operator()(const Class& x)const |
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{ |
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return x.*PtrToMember; |
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} |
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Type& operator()(const reference_wrapper<const Class>& x)const |
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{ |
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return operator()(x.get()); |
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} |
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Type& operator()(const reference_wrapper<Class>& x,int=0)const |
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{ |
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return operator()(x.get()); |
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} |
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}; |
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template<class Class,typename Type,Type Class::*PtrToMember> |
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struct non_const_member_base |
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{ |
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typedef Type result_type; |
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template<typename ChainedPtr> |
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#if !defined(BOOST_NO_SFINAE) |
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typename disable_if< |
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is_convertible<const ChainedPtr&,const Class&>,Type&>::type |
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#else |
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Type& |
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#endif |
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operator()(const ChainedPtr& x)const |
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{ |
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return operator()(*x); |
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} |
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const Type& operator()(const Class& x,int=0)const |
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{ |
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return x.*PtrToMember; |
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} |
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Type& operator()(Class& x)const |
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{ |
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return x.*PtrToMember; |
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} |
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const Type& operator()(const reference_wrapper<const Class>& x,int=0)const |
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{ |
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return operator()(x.get()); |
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} |
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Type& operator()(const reference_wrapper<Class>& x)const |
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{ |
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return operator()(x.get()); |
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} |
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}; |
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} /* namespace multi_index::detail */ |
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template<class Class,typename Type,Type Class::*PtrToMember> |
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struct member: |
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mpl::if_c< |
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is_const<Type>::value, |
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detail::const_member_base<Class,Type,PtrToMember>, |
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detail::non_const_member_base<Class,Type,PtrToMember> |
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>::type |
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{ |
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}; |
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namespace detail{ |
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/* MSVC++ 6.0 does not support properly pointers to members as |
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* non-type template arguments, as reported in |
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* http://support.microsoft.com/default.aspx?scid=kb;EN-US;249045 |
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* A similar problem (though not identical) is shown by MSVC++ 7.0. |
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* We provide an alternative to member<> accepting offsets instead |
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* of pointers to members. This happens to work even for non-POD |
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* types (although the standard forbids use of offsetof on these), |
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* so it serves as a workaround in this compiler for all practical |
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* purposes. |
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* Surprisingly enough, other compilers, like Intel C++ 7.0/7.1 and |
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* Visual Age 6.0, have similar bugs. This replacement of member<> |
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* can be used for them too. |
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*/ |
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template<class Class,typename Type,std::size_t OffsetOfMember> |
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struct const_member_offset_base |
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{ |
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typedef Type result_type; |
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template<typename ChainedPtr> |
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#if !defined(BOOST_NO_SFINAE) |
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typename disable_if< |
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is_convertible<const ChainedPtr&,const Class&>,Type&>::type |
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#else |
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Type& |
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#endif |
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operator()(const ChainedPtr& x)const |
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{ |
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return operator()(*x); |
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} |
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Type& operator()(const Class& x)const |
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{ |
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return *static_cast<const Type*>( |
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static_cast<const void*>( |
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static_cast<const char*>( |
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static_cast<const void *>(&x))+OffsetOfMember)); |
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} |
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Type& operator()(const reference_wrapper<const Class>& x)const |
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{ |
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return operator()(x.get()); |
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} |
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Type& operator()(const reference_wrapper<Class>& x,int=0)const |
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{ |
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return operator()(x.get()); |
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} |
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}; |
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template<class Class,typename Type,std::size_t OffsetOfMember> |
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struct non_const_member_offset_base |
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{ |
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typedef Type result_type; |
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template<typename ChainedPtr> |
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#if !defined(BOOST_NO_SFINAE) |
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typename disable_if< |
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is_convertible<const ChainedPtr&,const Class&>,Type&>::type |
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#else |
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Type& |
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#endif |
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operator()(const ChainedPtr& x)const |
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{ |
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return operator()(*x); |
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} |
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const Type& operator()(const Class& x,int=0)const |
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{ |
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return *static_cast<const Type*>( |
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static_cast<const void*>( |
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static_cast<const char*>( |
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static_cast<const void *>(&x))+OffsetOfMember)); |
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} |
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Type& operator()(Class& x)const |
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{ |
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return *static_cast<Type*>( |
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static_cast<void*>( |
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static_cast<char*>(static_cast<void *>(&x))+OffsetOfMember)); |
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} |
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const Type& operator()(const reference_wrapper<const Class>& x,int=0)const |
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{ |
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return operator()(x.get()); |
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} |
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Type& operator()(const reference_wrapper<Class>& x)const |
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{ |
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return operator()(x.get()); |
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} |
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}; |
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} /* namespace multi_index::detail */ |
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template<class Class,typename Type,std::size_t OffsetOfMember> |
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struct member_offset: |
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mpl::if_c< |
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is_const<Type>::value, |
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detail::const_member_offset_base<Class,Type,OffsetOfMember>, |
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detail::non_const_member_offset_base<Class,Type,OffsetOfMember> |
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>::type |
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{ |
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}; |
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/* BOOST_MULTI_INDEX_MEMBER resolves to member in the normal cases, |
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* and to member_offset as a workaround in those defective compilers for |
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* which BOOST_NO_POINTER_TO_MEMBER_TEMPLATE_PARAMETERS is defined. |
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*/ |
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#if defined(BOOST_NO_POINTER_TO_MEMBER_TEMPLATE_PARAMETERS) |
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#define BOOST_MULTI_INDEX_MEMBER(Class,Type,MemberName) \ |
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::boost::multi_index::member_offset< Class,Type,offsetof(Class,MemberName) > |
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#else |
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#define BOOST_MULTI_INDEX_MEMBER(Class,Type,MemberName) \ |
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::boost::multi_index::member< Class,Type,&Class::MemberName > |
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#endif |
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} /* namespace multi_index */ |
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} /* namespace boost */ |
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#endif
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