| |
| // 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/config/workaround.hpp> |
| # include <boost/typeof/constant.hpp> |
| # include <boost/type_traits/enable_if.hpp> |
| # include <boost/type_traits/is_function.hpp> |
| |
| # include <typeinfo> |
| |
| namespace boost |
| { |
| namespace type_of |
| { |
| |
| //Compile time constant code |
| # if 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,>=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 |
| |
| template<int ID> |
| struct msvc_typeid_wrapper { |
| typedef typename msvc_extract_type<constant<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,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 enable_if_< |
| !is_function<T>::value, |
| typename sizer<T>::type>::type encode_start(T const&); |
| |
| template<typename T> typename enable_if_< |
| is_function<T>::value, |
| typename sizer<T>::type>::type encode_start(T&); |
| 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 {\ |
| enum {_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 {\ |
| enum {_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 |