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- // Copyright (C) 2007 Peder Holt
- // Use, modification and distribution is subject to the Boost Software
- // License, Version 1.0. (http://www.boost.org/LICENSE_1_0.txt)
- #ifndef BOOST_TYPEOF_MSVC_TYPEOF_IMPL_HPP_INCLUDED
- # define BOOST_TYPEOF_MSVC_TYPEOF_IMPL_HPP_INCLUDED
- # include <boost/config.hpp>
- # include <boost/config/workaround.hpp>
- # include <boost/typeof/constant.hpp>
- namespace boost
- {
- namespace type_of
- {
- template<int N> struct encode_counter : encode_counter<N - 1> {};
- template<> struct encode_counter<0> {};
- char (*encode_index(...))[1];
- # define BOOST_TYPEOF_INDEX(T) (sizeof(*boost::type_of::encode_index((boost::type_of::encode_counter<1000>*)0)))
- # define BOOST_TYPEOF_NEXT_INDEX(next) friend char (*encode_index(encode_counter<next>*))[next];
- //Typeof code
- template<typename ID>
- struct msvc_extract_type
- {
- struct id2type;
- };
- template<typename T, typename ID>
- struct msvc_register_type : msvc_extract_type<ID>
- {
- typedef msvc_extract_type<ID> base_type;
- struct base_type::id2type // This uses nice VC6.5 and VC7.1 bugfeature, also works for Digital Mars
- {
- typedef T type;
- };
- };
- template<int ID>
- struct msvc_typeid_wrapper {
- typedef typename msvc_extract_type<constant<int,ID> >::id2type id2type;
- typedef typename id2type::type type;
- };
- //Tie it all together
- template<typename T>
- struct encode_type
- {
- //Get the next available compile time constants index
- BOOST_STATIC_CONSTANT(unsigned,value=BOOST_TYPEOF_INDEX(T));
- //Instantiate the template
- typedef typename msvc_register_type<T,constant<int,value> >::id2type type;
- //Set the next compile time constants index
- BOOST_STATIC_CONSTANT(unsigned,next=value+1);
- //Increment the compile time constant (only needed when extensions are not active
- BOOST_TYPEOF_NEXT_INDEX(next);
- };
- template<class T>
- struct sizer
- {
- typedef char(*type)[encode_type<T>::value];
- };
- template<typename T>
- typename sizer<T>::type encode_start(T const&);
- template<typename Organizer, typename T>
- msvc_register_type<T,Organizer> typeof_register_type(const T&,Organizer* =0);
- # define BOOST_TYPEOF(expr) \
- boost::type_of::msvc_typeid_wrapper<sizeof(*boost::type_of::encode_start(expr))>::type
- # define BOOST_TYPEOF_TPL(expr) typename BOOST_TYPEOF(expr)
- # define BOOST_TYPEOF_NESTED_TYPEDEF_TPL(name,expr) \
- struct name {\
- BOOST_STATIC_CONSTANT(int,_typeof_register_value=sizeof(boost::type_of::typeof_register_type<name>(expr)));\
- typedef typename boost::type_of::msvc_extract_type<name>::id2type id2type;\
- typedef typename id2type::type type;\
- };
- # define BOOST_TYPEOF_NESTED_TYPEDEF(name,expr) \
- struct name {\
- BOOST_STATIC_CONSTANT(int,_typeof_register_value=sizeof(boost::type_of::typeof_register_type<name>(expr)));\
- typedef boost::type_of::msvc_extract_type<name>::id2type id2type;\
- typedef id2type::type type;\
- };
- }
- }
- #endif//BOOST_TYPEOF_MSVC_TYPEOF_IMPL_HPP_INCLUDED
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