/boost/typeof/msvc/typeof_impl.hpp
C++ Header | 283 lines | 221 code | 40 blank | 22 comment | 6 complexity | b4f1c98c85b37364c5e48d11608c7ec0 MD5 | raw file
- // Copyright (C) 2005 Igor Chesnokov, mailto:ichesnokov@gmail.com (VC 6.5,VC 7.1 + counter code)
- // Copyright (C) 2005-2007 Peder Holt (VC 7.0 + framework)
- // Copyright (C) 2006 Steven Watanabe (VC 8.0)
- // 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/detail/workaround.hpp>
- # include <boost/mpl/int.hpp>
- # include <boost/type_traits/is_function.hpp>
- # include <boost/utility/enable_if.hpp>
- # if BOOST_WORKAROUND(BOOST_MSVC,>=1310)
- # include <typeinfo>
- # endif
- namespace boost
- {
- namespace type_of
- {
- //Compile time constant code
- # if BOOST_WORKAROUND(BOOST_MSVC,>=1300) && defined(_MSC_EXTENSIONS)
- template<int N> struct the_counter;
- template<typename T,int N = 5/*for similarity*/>
- struct encode_counter
- {
- __if_exists(the_counter<N + 256>)
- {
- BOOST_STATIC_CONSTANT(unsigned,count=(encode_counter<T,N + 257>::count));
- }
- __if_not_exists(the_counter<N + 256>)
- {
- __if_exists(the_counter<N + 64>)
- {
- BOOST_STATIC_CONSTANT(unsigned,count=(encode_counter<T,N + 65>::count));
- }
- __if_not_exists(the_counter<N + 64>)
- {
- __if_exists(the_counter<N + 16>)
- {
- BOOST_STATIC_CONSTANT(unsigned,count=(encode_counter<T,N + 17>::count));
- }
- __if_not_exists(the_counter<N + 16>)
- {
- __if_exists(the_counter<N + 4>)
- {
- BOOST_STATIC_CONSTANT(unsigned,count=(encode_counter<T,N + 5>::count));
- }
- __if_not_exists(the_counter<N + 4>)
- {
- __if_exists(the_counter<N>)
- {
- BOOST_STATIC_CONSTANT(unsigned,count=(encode_counter<T,N + 1>::count));
- }
- __if_not_exists(the_counter<N>)
- {
- BOOST_STATIC_CONSTANT(unsigned,count=N);
- typedef the_counter<N> type;
- }
- }
- }
- }
- }
- };
- # define BOOST_TYPEOF_INDEX(T) (encode_counter<T>::count)
- # define BOOST_TYPEOF_NEXT_INDEX(next)
- # else
- template<int N> struct encode_counter : encode_counter<N - 1> {};
- template<> struct encode_counter<0> {};
- //Need to default to a larger value than 4, as due to MSVC's ETI errors. (sizeof(int)==4)
- char (*encode_index(...))[5];
- # define BOOST_TYPEOF_INDEX(T) (sizeof(*boost::type_of::encode_index((boost::type_of::encode_counter<1005>*)0)))
- # define BOOST_TYPEOF_NEXT_INDEX(next) friend char (*encode_index(encode_counter<next>*))[next];
- # endif
- //Typeof code
- # if BOOST_WORKAROUND(BOOST_MSVC,==1300)
- template<typename ID>
- struct msvc_extract_type
- {
- template<bool>
- struct id2type_impl;
- typedef id2type_impl<true> id2type;
- };
- template<typename T, typename ID>
- struct msvc_register_type : msvc_extract_type<ID>
- {
- template<>
- struct id2type_impl<true> //VC7.0 specific bugfeature
- {
- typedef T type;
- };
- };
- #elif BOOST_WORKAROUND(BOOST_MSVC,>=1400)
- struct msvc_extract_type_default_param {};
- template<typename ID, typename T = msvc_extract_type_default_param>
- struct msvc_extract_type;
- template<typename ID>
- struct msvc_extract_type<ID, msvc_extract_type_default_param> {
- template<bool>
- struct id2type_impl;
- typedef id2type_impl<true> id2type;
- };
- template<typename ID, typename T>
- struct msvc_extract_type : msvc_extract_type<ID,msvc_extract_type_default_param>
- {
- template<>
- struct id2type_impl<true> //VC8.0 specific bugfeature
- {
- typedef T type;
- };
- template<bool>
- struct id2type_impl;
- typedef id2type_impl<true> id2type;
- };
- template<typename T, typename ID>
- struct msvc_register_type : msvc_extract_type<ID, T>
- {
- };
- # else
- 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
- {
- typedef T type;
- };
- };
- # endif
- // EAN: preprocess this block out on advice of Peder Holt
- // to eliminate errors in type_traits/common_type.hpp
- # if 0 //BOOST_WORKAROUND(BOOST_MSVC,==1310)
- template<const std::type_info& ref_type_info>
- struct msvc_typeid_wrapper {
- typedef typename msvc_extract_type<msvc_typeid_wrapper>::id2type id2type;
- typedef typename id2type::type wrapped_type;
- typedef typename wrapped_type::type type;
- };
- //This class is used for registering the type T. encode_type<T> is mapped against typeid(encode_type<T>).
- //msvc_typeid_wrapper<typeid(encode_type<T>)> will now have a type typedef that equals encode_type<T>.
- template<typename T>
- struct encode_type
- {
- typedef encode_type<T> input_type;
- //Invoke registration of encode_type<T>. typeid(encode_type<T>) is now mapped to encode_type<T>. Do not use registered_type for anything.
- //The reason for registering encode_type<T> rather than T, is that VC handles typeid(function reference) poorly. By adding another
- //level of indirection, we solve this problem.
- typedef typename msvc_register_type<input_type,msvc_typeid_wrapper<typeid(input_type)> >::id2type registered_type;
- typedef T type;
- };
- template<typename T> typename disable_if<
- typename is_function<T>::type,
- typename encode_type<T>::input_type>::type encode_start(T const&);
- template<typename T> typename enable_if<
- typename is_function<T>::type,
- typename encode_type<T>::input_type>::type encode_start(T&);
- template<typename Organizer, typename T>
- msvc_register_type<T,Organizer> typeof_register_type(const T&);
- # define BOOST_TYPEOF(expr) \
- boost::type_of::msvc_typeid_wrapper<typeid(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 {\
- enum {_typeof_register_value=sizeof(typeid(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 {\
- enum {_typeof_register_value=sizeof(typeid(boost::type_of::typeof_register_type<name>(expr)))};\
- typedef boost::type_of::msvc_extract_type<name>::id2type id2type;\
- typedef id2type::type type;\
- };
- # else
- template<int ID>
- struct msvc_typeid_wrapper {
- typedef typename msvc_extract_type<mpl::int_<ID> >::id2type id2type;
- typedef typename id2type::type type;
- };
- //Workaround for ETI-bug for VC6 and VC7
- template<>
- struct msvc_typeid_wrapper<1> {
- typedef msvc_typeid_wrapper<1> type;
- };
- //Workaround for ETI-bug for VC7.1
- template<>
- struct msvc_typeid_wrapper<4> {
- typedef msvc_typeid_wrapper<4> 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,mpl::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];
- };
- # if BOOST_WORKAROUND(BOOST_MSVC,>=1310)
- template<typename T> typename disable_if<
- typename is_function<T>::type,
- typename sizer<T>::type>::type encode_start(T const&);
- template<typename T> typename enable_if<
- typename is_function<T>::type,
- typename sizer<T>::type>::type encode_start(T&);
- # else
- template<typename T>
- typename sizer<T>::type encode_start(T const&);
- # endif
- 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
- }
- }
- #endif//BOOST_TYPEOF_MSVC_TYPEOF_IMPL_HPP_INCLUDED