101 lines
3.4 KiB
Plaintext
101 lines
3.4 KiB
Plaintext
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// Copyright (C) 2007 Peder Holt
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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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namespace boost
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{
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namespace type_of
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{
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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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char (*encode_index(...))[1];
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# define BOOST_TYPEOF_INDEX(T) (sizeof(*boost::type_of::encode_index((boost::type_of::encode_counter<1000>*)0)))
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# define BOOST_TYPEOF_NEXT_INDEX(next) friend char (*encode_index(encode_counter<next>*))[next];
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//Typeof code
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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, also works for Digital Mars
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{
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typedef T type;
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};
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};
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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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//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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template<typename T>
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typename sizer<T>::type encode_start(T const&);
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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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}
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}
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#endif//BOOST_TYPEOF_MSVC_TYPEOF_IMPL_HPP_INCLUDED
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