Subject: Re: [boost] VC10 config - some regressions in several libraries
From: John Maddock (boost.regex_at_[hidden])
Date: 2010-04-26 12:05:41
> It seems that my problem with move emulation in projects imported from
> older MSVC to MSVC10 is that some rvalue references rules need language
> extensions option activated. Otherwise we can't have movable-only types.
It seems some explicit casts are required, for example in
boost/interprocess/detail/move.hpp:
template <class T> inline
typename remove_reference<T>::type&& move(T&& t)
{ return t; }
Should be either:
template <class T> inline
typename remove_reference<T>::type&& move(T&& t)
{ return std::move(t); }
or
template <class T> inline
typename remove_reference<T>::type&& move(T&& t)
{ return static_cast<typename remove_reference<T>::type&&>(t); }
Likewise for the "forward" function.
However that still leaves errors deep within the Boost.Preprocessor code:
1> adaptive_node_pool_test.cpp
1>m:\data\boost\trunk\boost\preprocessor\iteration\detail\local.hpp(37):
error C2664: 'boost::interprocess::forward' : cannot convert parameter 1
from
'boost::interprocess::segment_manager<CharType,MemoryAlgorithm,IndexType> '
to 'boost::interprocess::segment_manager<CharType,MemoryAlgorithm,IndexType>
*&&'
1> with
1> [
1> CharType=char,
1>
MemoryAlgorithm=boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>,
1> IndexType=boost::interprocess::iset_index
1> ]
1> You cannot bind an lvalue to an rvalue reference
1>
m:\data\boost\trunk\libs\interprocess\test\node_pool_test.hpp(146) : see
reference to function template instantiation 'T
*boost::interprocess::detail::named_proxy<SegmentManager,T,is_iterator>::operator
()<boost::interprocess::segment_manager<CharType,MemoryAlgorithm,IndexType>*>(P0
&&) const' being compiled
1> with
1> [
1> T=node_pool_t,
1>
SegmentManager=boost::interprocess::segment_manager<char,boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>,boost::interprocess::iset_index>,
1> is_iterator=false,
1> CharType=char,
1>
MemoryAlgorithm=boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>,
1> IndexType=boost::interprocess::iset_index,
1>
P0=boost::interprocess::segment_manager<char,boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>,boost::interprocess::iset_index>
*
1> ]
1>
m:\data\boost\trunk\libs\interprocess\test\adaptive_node_pool_test.cpp(24) :
see reference to function template instantiation 'bool
boost::interprocess::test::test_all_node_pool<node_pool_t>(void)' being
compiled
Which appear to have the same cause, but I'm unable to figure out what needs
changing.
Seems likely that gcc in C++0x mode has the same issues - creating an rvalue
ref needs an explicit cast.
HTH, John.