284 lines
10 KiB
Plaintext
284 lines
10 KiB
Plaintext
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// Copyright (C) 2005 Igor Chesnokov, mailto:ichesnokov@gmail.com (VC 6.5,VC 7.1 + counter code)
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// Copyright (C) 2005-2007 Peder Holt (VC 7.0 + framework)
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// Copyright (C) 2006 Steven Watanabe (VC 8.0)
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// Use, modification and distribution is subject to the Boost Software
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// License, Version 1.0. (http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_TYPEOF_MSVC_TYPEOF_IMPL_HPP_INCLUDED
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# define BOOST_TYPEOF_MSVC_TYPEOF_IMPL_HPP_INCLUDED
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# include <boost/config.hpp>
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# include <boost/detail/workaround.hpp>
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# include <boost/mpl/int.hpp>
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# include <boost/type_traits/is_function.hpp>
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# include <boost/utility/enable_if.hpp>
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# if BOOST_WORKAROUND(BOOST_MSVC,>=1310)
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# include <typeinfo>
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# endif
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namespace boost
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{
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namespace type_of
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{
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//Compile time constant code
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# if BOOST_WORKAROUND(BOOST_MSVC,>=1300) && defined(_MSC_EXTENSIONS)
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template<int N> struct the_counter;
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template<typename T,int N = 5/*for similarity*/>
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struct encode_counter
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{
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__if_exists(the_counter<N + 256>)
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{
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BOOST_STATIC_CONSTANT(unsigned,count=(encode_counter<T,N + 257>::count));
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}
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__if_not_exists(the_counter<N + 256>)
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{
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__if_exists(the_counter<N + 64>)
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{
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BOOST_STATIC_CONSTANT(unsigned,count=(encode_counter<T,N + 65>::count));
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}
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__if_not_exists(the_counter<N + 64>)
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{
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__if_exists(the_counter<N + 16>)
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{
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BOOST_STATIC_CONSTANT(unsigned,count=(encode_counter<T,N + 17>::count));
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}
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__if_not_exists(the_counter<N + 16>)
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{
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__if_exists(the_counter<N + 4>)
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{
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BOOST_STATIC_CONSTANT(unsigned,count=(encode_counter<T,N + 5>::count));
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}
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__if_not_exists(the_counter<N + 4>)
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{
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__if_exists(the_counter<N>)
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{
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BOOST_STATIC_CONSTANT(unsigned,count=(encode_counter<T,N + 1>::count));
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}
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__if_not_exists(the_counter<N>)
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{
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BOOST_STATIC_CONSTANT(unsigned,count=N);
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typedef the_counter<N> type;
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}
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}
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}
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}
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}
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};
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# define BOOST_TYPEOF_INDEX(T) (encode_counter<T>::count)
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# define BOOST_TYPEOF_NEXT_INDEX(next)
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# else
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template<int N> struct encode_counter : encode_counter<N - 1> {};
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template<> struct encode_counter<0> {};
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//Need to default to a larger value than 4, as due to MSVC's ETI errors. (sizeof(int)==4)
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char (*encode_index(...))[5];
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# define BOOST_TYPEOF_INDEX(T) (sizeof(*boost::type_of::encode_index((boost::type_of::encode_counter<1005>*)0)))
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# define BOOST_TYPEOF_NEXT_INDEX(next) friend char (*encode_index(encode_counter<next>*))[next];
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# endif
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//Typeof code
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# if BOOST_WORKAROUND(BOOST_MSVC,==1300)
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template<typename ID>
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struct msvc_extract_type
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{
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template<bool>
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struct id2type_impl;
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typedef id2type_impl<true> id2type;
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};
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template<typename T, typename ID>
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struct msvc_register_type : msvc_extract_type<ID>
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{
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template<>
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struct id2type_impl<true> //VC7.0 specific bugfeature
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{
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typedef T type;
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};
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};
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#elif BOOST_WORKAROUND(BOOST_MSVC,>=1400)
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struct msvc_extract_type_default_param {};
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template<typename ID, typename T = msvc_extract_type_default_param>
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struct msvc_extract_type;
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template<typename ID>
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struct msvc_extract_type<ID, msvc_extract_type_default_param> {
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template<bool>
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struct id2type_impl;
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typedef id2type_impl<true> id2type;
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};
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template<typename ID, typename T>
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struct msvc_extract_type : msvc_extract_type<ID,msvc_extract_type_default_param>
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{
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template<>
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struct id2type_impl<true> //VC8.0 specific bugfeature
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{
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typedef T type;
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};
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template<bool>
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struct id2type_impl;
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typedef id2type_impl<true> id2type;
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};
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template<typename T, typename ID>
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struct msvc_register_type : msvc_extract_type<ID, T>
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{
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};
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# else
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template<typename ID>
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struct msvc_extract_type
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{
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struct id2type;
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};
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template<typename T, typename ID>
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struct msvc_register_type : msvc_extract_type<ID>
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{
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typedef msvc_extract_type<ID> base_type;
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struct base_type::id2type // This uses nice VC6.5 and VC7.1 bugfeature
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{
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typedef T type;
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};
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};
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# endif
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// EAN: preprocess this block out on advice of Peder Holt
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// to eliminate errors in type_traits/common_type.hpp
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# if 0 //BOOST_WORKAROUND(BOOST_MSVC,==1310)
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template<const std::type_info& ref_type_info>
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struct msvc_typeid_wrapper {
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typedef typename msvc_extract_type<msvc_typeid_wrapper>::id2type id2type;
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typedef typename id2type::type wrapped_type;
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typedef typename wrapped_type::type type;
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};
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//This class is used for registering the type T. encode_type<T> is mapped against typeid(encode_type<T>).
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//msvc_typeid_wrapper<typeid(encode_type<T>)> will now have a type typedef that equals encode_type<T>.
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template<typename T>
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struct encode_type
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{
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typedef encode_type<T> input_type;
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//Invoke registration of encode_type<T>. typeid(encode_type<T>) is now mapped to encode_type<T>. Do not use registered_type for anything.
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//The reason for registering encode_type<T> rather than T, is that VC handles typeid(function reference) poorly. By adding another
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//level of indirection, we solve this problem.
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typedef typename msvc_register_type<input_type,msvc_typeid_wrapper<typeid(input_type)> >::id2type registered_type;
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typedef T type;
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};
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template<typename T> typename disable_if<
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typename is_function<T>::type,
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typename encode_type<T>::input_type>::type encode_start(T const&);
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template<typename T> typename enable_if<
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typename is_function<T>::type,
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typename encode_type<T>::input_type>::type encode_start(T&);
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template<typename Organizer, typename T>
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msvc_register_type<T,Organizer> typeof_register_type(const T&);
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# define BOOST_TYPEOF(expr) \
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boost::type_of::msvc_typeid_wrapper<typeid(boost::type_of::encode_start(expr))>::type
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# define BOOST_TYPEOF_TPL(expr) typename BOOST_TYPEOF(expr)
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# define BOOST_TYPEOF_NESTED_TYPEDEF_TPL(name,expr) \
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struct name {\
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enum {_typeof_register_value=sizeof(typeid(boost::type_of::typeof_register_type<name>(expr)))};\
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typedef typename boost::type_of::msvc_extract_type<name>::id2type id2type;\
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typedef typename id2type::type type;\
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};
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# define BOOST_TYPEOF_NESTED_TYPEDEF(name,expr) \
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struct name {\
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enum {_typeof_register_value=sizeof(typeid(boost::type_of::typeof_register_type<name>(expr)))};\
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typedef boost::type_of::msvc_extract_type<name>::id2type id2type;\
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typedef id2type::type type;\
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};
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# else
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template<int ID>
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struct msvc_typeid_wrapper {
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typedef typename msvc_extract_type<mpl::int_<ID> >::id2type id2type;
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typedef typename id2type::type type;
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};
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//Workaround for ETI-bug for VC6 and VC7
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template<>
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struct msvc_typeid_wrapper<1> {
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typedef msvc_typeid_wrapper<1> type;
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};
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//Workaround for ETI-bug for VC7.1
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template<>
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struct msvc_typeid_wrapper<4> {
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typedef msvc_typeid_wrapper<4> type;
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};
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//Tie it all together
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template<typename T>
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struct encode_type
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{
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//Get the next available compile time constants index
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BOOST_STATIC_CONSTANT(unsigned,value=BOOST_TYPEOF_INDEX(T));
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//Instantiate the template
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typedef typename msvc_register_type<T,mpl::int_<value> >::id2type type;
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//Set the next compile time constants index
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BOOST_STATIC_CONSTANT(unsigned,next=value+1);
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//Increment the compile time constant (only needed when extensions are not active
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BOOST_TYPEOF_NEXT_INDEX(next);
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};
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template<class T>
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struct sizer
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{
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typedef char(*type)[encode_type<T>::value];
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};
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# if BOOST_WORKAROUND(BOOST_MSVC,>=1310)
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template<typename T> typename disable_if<
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typename is_function<T>::type,
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typename sizer<T>::type>::type encode_start(T const&);
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template<typename T> typename enable_if<
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typename is_function<T>::type,
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typename sizer<T>::type>::type encode_start(T&);
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# else
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template<typename T>
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typename sizer<T>::type encode_start(T const&);
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# endif
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template<typename Organizer, typename T>
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msvc_register_type<T,Organizer> typeof_register_type(const T&,Organizer* =0);
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# define BOOST_TYPEOF(expr) \
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boost::type_of::msvc_typeid_wrapper<sizeof(*boost::type_of::encode_start(expr))>::type
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# define BOOST_TYPEOF_TPL(expr) typename BOOST_TYPEOF(expr)
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# define BOOST_TYPEOF_NESTED_TYPEDEF_TPL(name,expr) \
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struct name {\
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BOOST_STATIC_CONSTANT(int,_typeof_register_value=sizeof(boost::type_of::typeof_register_type<name>(expr)));\
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typedef typename boost::type_of::msvc_extract_type<name>::id2type id2type;\
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typedef typename id2type::type type;\
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};
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# define BOOST_TYPEOF_NESTED_TYPEDEF(name,expr) \
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struct name {\
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BOOST_STATIC_CONSTANT(int,_typeof_register_value=sizeof(boost::type_of::typeof_register_type<name>(expr)));\
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typedef boost::type_of::msvc_extract_type<name>::id2type id2type;\
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typedef id2type::type type;\
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};
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#endif
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}
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}
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#endif//BOOST_TYPEOF_MSVC_TYPEOF_IMPL_HPP_INCLUDED
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