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/* Copyright 2003-2013 Joaquin M Lopez Munoz.
* 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_MEM_FUN_HPP
#define BOOST_MULTI_INDEX_MEM_FUN_HPP
#if defined(_MSC_VER)
#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/remove_reference.hpp>
#include <boost/utility/enable_if.hpp>
#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{
/* mem_fun implements a read-only key extractor based on a given non-const
* member function of a class.
* const_mem_fun does the same for const member functions.
* Additionally, mem_fun and const_mem_fun are 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*>.)
*/
template<class Class,typename Type,Type (Class::*PtrToMemberFunction)()const>
struct const_mem_fun
{
typedef typename remove_reference<Type>::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.*PtrToMemberFunction)();
}
Type operator()(const reference_wrapper<const Class>& x)const
{
return operator()(x.get());
}
Type operator()(const reference_wrapper<Class>& x)const
{
return operator()(x.get());
}
};
template<class Class,typename Type,Type (Class::*PtrToMemberFunction)()>
struct mem_fun
{
typedef typename remove_reference<Type>::type result_type;
template<typename ChainedPtr>
#if !defined(BOOST_NO_SFINAE)
typename disable_if<
is_convertible<ChainedPtr&,Class&>,Type>::type
#else
Type
#endif
operator()(const ChainedPtr& x)const
{
return operator()(*x);
}
Type operator()(Class& x)const
{
return (x.*PtrToMemberFunction)();
}
Type operator()(const reference_wrapper<Class>& x)const
{
return operator()(x.get());
}
};
/* MSVC++ 6.0 has problems with const member functions as non-type template
* parameters, somehow it takes them as non-const. const_mem_fun_explicit
* workarounds this deficiency by accepting an extra type parameter that
* specifies the signature of the member function. The workaround was found at:
* Daniel, C.:"Re: weird typedef problem in VC",
* news:microsoft.public.vc.language, 21st nov 2002,
* http://groups.google.com/groups?
* hl=en&lr=&ie=UTF-8&selm=ukwvg3O0BHA.1512%40tkmsftngp05
*
* MSVC++ 6.0 support has been dropped and [const_]mem_fun_explicit is
* deprecated.
*/
template<
class Class,typename Type,
typename PtrToMemberFunctionType,PtrToMemberFunctionType PtrToMemberFunction>
struct const_mem_fun_explicit
{
typedef typename remove_reference<Type>::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.*PtrToMemberFunction)();
}
Type operator()(const reference_wrapper<const Class>& x)const
{
return operator()(x.get());
}
Type operator()(const reference_wrapper<Class>& x)const
{
return operator()(x.get());
}
};
template<
class Class,typename Type,
typename PtrToMemberFunctionType,PtrToMemberFunctionType PtrToMemberFunction>
struct mem_fun_explicit
{
typedef typename remove_reference<Type>::type result_type;
template<typename ChainedPtr>
#if !defined(BOOST_NO_SFINAE)
typename disable_if<
is_convertible<ChainedPtr&,Class&>,Type>::type
#else
Type
#endif
operator()(const ChainedPtr& x)const
{
return operator()(*x);
}
Type operator()(Class& x)const
{
return (x.*PtrToMemberFunction)();
}
Type operator()(const reference_wrapper<Class>& x)const
{
return operator()(x.get());
}
};
/* BOOST_MULTI_INDEX_CONST_MEM_FUN and BOOST_MULTI_INDEX_MEM_FUN used to
* resolve to [const_]mem_fun_explicit for MSVC++ 6.0 and to
* [const_]mem_fun otherwise. Support for this compiler having been dropped,
* they are now just wrappers over [const_]mem_fun kept for backwards-
* compatibility reasons.
*/
#define BOOST_MULTI_INDEX_CONST_MEM_FUN(Class,Type,MemberFunName) \
::boost::multi_index::const_mem_fun< Class,Type,&Class::MemberFunName >
#define BOOST_MULTI_INDEX_MEM_FUN(Class,Type,MemberFunName) \
::boost::multi_index::mem_fun< Class,Type,&Class::MemberFunName >
} /* namespace multi_index */
} /* namespace boost */
#endif
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