williamr@2: /* Copyright 2003-2006 Joaquín M López Muñoz. williamr@2: * Distributed under the Boost Software License, Version 1.0. williamr@2: * (See accompanying file LICENSE_1_0.txt or copy at williamr@2: * http://www.boost.org/LICENSE_1_0.txt) williamr@2: * williamr@2: * See http://www.boost.org/libs/multi_index for library home page. williamr@2: */ williamr@2: williamr@2: #ifndef BOOST_MULTI_INDEX_MEM_FUN_HPP williamr@2: #define BOOST_MULTI_INDEX_MEM_FUN_HPP williamr@2: williamr@2: #if defined(_MSC_VER)&&(_MSC_VER>=1200) williamr@2: #pragma once williamr@2: #endif williamr@2: williamr@2: #include /* keep it first to prevent nasty warns in MSVC */ williamr@2: #include williamr@2: #include williamr@2: #include williamr@2: williamr@2: #if !defined(BOOST_NO_SFINAE) williamr@2: #include williamr@2: #endif williamr@2: williamr@2: namespace boost{ williamr@2: williamr@2: template class reference_wrapper; /* fwd decl. */ williamr@2: williamr@2: namespace multi_index{ williamr@2: williamr@2: /* mem_fun implements a read-only key extractor based on a given non-const williamr@2: * member function of a class. williamr@2: * const_mem_fun does the same for const member functions. williamr@2: * Additionally, mem_fun and const_mem_fun are overloaded to support williamr@2: * referece_wrappers of T and "chained pointers" to T's. By chained pointer williamr@2: * to T we mean a type P such that, given a p of Type P williamr@2: * *...n...*x is convertible to T&, for some n>=1. williamr@2: * Examples of chained pointers are raw and smart pointers, iterators and williamr@2: * arbitrary combinations of these (vg. T** or auto_ptr.) williamr@2: */ williamr@2: williamr@2: /* NB. Some overloads of operator() have an extra dummy parameter int=0. williamr@2: * This disambiguator serves several purposes: williamr@2: * - Without it, MSVC++ 6.0 incorrectly regards some overloads as williamr@2: * specializations of a previous member function template. williamr@2: * - MSVC++ 6.0/7.0 seem to incorrectly treat some different memfuns williamr@2: * as if they have the same signature. williamr@2: * - If remove_const is broken due to lack of PTS, int=0 avoids the williamr@2: * declaration of memfuns with identical signature. williamr@2: */ williamr@2: williamr@2: template williamr@2: struct const_mem_fun williamr@2: { williamr@2: typedef typename remove_reference::type result_type; williamr@2: williamr@2: template williamr@2: williamr@2: #if !defined(BOOST_NO_SFINAE) williamr@2: typename disable_if< williamr@2: is_convertible,Type>::type williamr@2: #else williamr@2: Type williamr@2: #endif williamr@2: williamr@2: operator()(const ChainedPtr& x)const williamr@2: { williamr@2: return operator()(*x); williamr@2: } williamr@2: williamr@2: Type operator()(const Class& x)const williamr@2: { williamr@2: return (x.*PtrToMemberFunction)(); williamr@2: } williamr@2: williamr@2: Type operator()(const reference_wrapper& x)const williamr@2: { williamr@2: return operator()(x.get()); williamr@2: } williamr@2: williamr@2: Type operator()(const reference_wrapper& x,int=0)const williamr@2: { williamr@2: return operator()(x.get()); williamr@2: } williamr@2: }; williamr@2: williamr@2: template williamr@2: struct mem_fun williamr@2: { williamr@2: typedef typename remove_reference::type result_type; williamr@2: williamr@2: template williamr@2: williamr@2: #if !defined(BOOST_NO_SFINAE) williamr@2: typename disable_if< williamr@2: is_convertible,Type>::type williamr@2: #else williamr@2: Type williamr@2: #endif williamr@2: williamr@2: operator()(const ChainedPtr& x)const williamr@2: { williamr@2: return operator()(*x); williamr@2: } williamr@2: williamr@2: Type operator()(Class& x)const williamr@2: { williamr@2: return (x.*PtrToMemberFunction)(); williamr@2: } williamr@2: williamr@2: Type operator()(const reference_wrapper& x)const williamr@2: { williamr@2: return operator()(x.get()); williamr@2: } williamr@2: }; williamr@2: williamr@2: /* MSVC++ 6.0 has problems with const member functions as non-type template williamr@2: * parameters, somehow it takes them as non-const. mem_fun_explicit workarounds williamr@2: * this defficiency by accepting an extra type parameter that specifies the williamr@2: * signature of he member function. The workaround was found at: williamr@2: * Daniel, C.:"Re: weird typedef problem in VC", williamr@2: * news:microsoft.public.vc.language, 21st nov 2002, williamr@2: * http://groups.google.com/groups? williamr@2: * hl=en&lr=&ie=UTF-8&selm=ukwvg3O0BHA.1512%40tkmsftngp05 williamr@2: */ williamr@2: williamr@2: template< williamr@2: class Class,typename Type, williamr@2: typename PtrToMemberFunctionType,PtrToMemberFunctionType PtrToMemberFunction> williamr@2: struct const_mem_fun_explicit williamr@2: { williamr@2: typedef typename remove_reference::type result_type; williamr@2: williamr@2: template williamr@2: williamr@2: #if !defined(BOOST_NO_SFINAE) williamr@2: typename disable_if< williamr@2: is_convertible,Type>::type williamr@2: #else williamr@2: Type williamr@2: #endif williamr@2: williamr@2: operator()(const ChainedPtr& x)const williamr@2: { williamr@2: return operator()(*x); williamr@2: } williamr@2: williamr@2: Type operator()(const Class& x)const williamr@2: { williamr@2: return (x.*PtrToMemberFunction)(); williamr@2: } williamr@2: williamr@2: Type operator()(const reference_wrapper& x)const williamr@2: { williamr@2: return operator()(x.get()); williamr@2: } williamr@2: williamr@2: Type operator()(const reference_wrapper& x,int=0)const williamr@2: { williamr@2: return operator()(x.get()); williamr@2: } williamr@2: }; williamr@2: williamr@2: template< williamr@2: class Class,typename Type, williamr@2: typename PtrToMemberFunctionType,PtrToMemberFunctionType PtrToMemberFunction> williamr@2: struct mem_fun_explicit williamr@2: { williamr@2: typedef typename remove_reference::type result_type; williamr@2: williamr@2: template williamr@2: williamr@2: #if !defined(BOOST_NO_SFINAE) williamr@2: typename disable_if< williamr@2: is_convertible,Type>::type williamr@2: #else williamr@2: Type williamr@2: #endif williamr@2: williamr@2: operator()(const ChainedPtr& x)const williamr@2: { williamr@2: return operator()(*x); williamr@2: } williamr@2: williamr@2: Type operator()(Class& x)const williamr@2: { williamr@2: return (x.*PtrToMemberFunction)(); williamr@2: } williamr@2: williamr@2: Type operator()(const reference_wrapper& x)const williamr@2: { williamr@2: return operator()(x.get()); williamr@2: } williamr@2: }; williamr@2: williamr@2: /* BOOST_MULTI_INDEX_CONST_MEM_FUN and BOOST_MULTI_INDEX_MEM_FUN resolve to williamr@2: * mem_fun_explicit for MSVC++ 6.0 and to [const_]mem_fun otherwise. williamr@2: */ williamr@2: williamr@2: #if defined(BOOST_MSVC)&&(BOOST_MSVC<1300) williamr@2: williamr@2: #define BOOST_MULTI_INDEX_CONST_MEM_FUN(Class,Type,MemberFunName) \ williamr@2: ::boost::multi_index::const_mem_fun_explicit<\ williamr@2: Class,Type,Type (Class::*)()const,&Class::MemberFunName > williamr@2: #define BOOST_MULTI_INDEX_MEM_FUN(Class,Type,MemberFunName) \ williamr@2: ::boost::multi_index::mem_fun_explicit<\ williamr@2: Class,Type,Type (Class::*)(),&Class::MemberFunName > williamr@2: williamr@2: #else williamr@2: williamr@2: #define BOOST_MULTI_INDEX_CONST_MEM_FUN(Class,Type,MemberFunName) \ williamr@2: ::boost::multi_index::const_mem_fun< Class,Type,&Class::MemberFunName > williamr@2: #define BOOST_MULTI_INDEX_MEM_FUN(Class,Type,MemberFunName) \ williamr@2: ::boost::multi_index::mem_fun< Class,Type,&Class::MemberFunName > williamr@2: williamr@2: #endif williamr@2: williamr@2: } /* namespace multi_index */ williamr@2: williamr@2: } /* namespace boost */ williamr@2: williamr@2: #endif