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Red Hat Bugzilla – Attachment 307043 Details for
Bug 448897
including <vector> generates aliasing error on double __attribute__ ((may_alias))
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example
may_alias.cxx (text/plain), 892 bytes, created by
Caolan McNamara
on 2008-05-29 12:35:31 UTC
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Description:
example
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MIME Type:
Creator:
Caolan McNamara
Created:
2008-05-29 12:35:31 UTC
Size:
892 bytes
patch
obsolete
>//g++ -c -O2 -Werror=strict-aliasing -Wall may_alias.cxx >//g++ -DINCLUDE_VECTOR -c -O2 -Werror=strict-aliasing -Wall may_alias.cxx >#ifdef INCLUDE_VECTOR >#include <vector> >#endif > >typedef struct _uno_Any >{ > void * pData; > void * pReserved; >} uno_Any; > >class Any : public uno_Any >{ >}; > >bool operator >>= ( const Any & rAny, long & value ) ; >bool operator >>= ( const Any & rAny, double & value ) ; > >bool operator >>= ( const Any & rAny, double & value ) >{ > typedef double __attribute__ ((may_alias)) double_a; > value = * reinterpret_cast< const double_a * >( &rAny.pReserved ); > return true; >} > >bool operator >>= ( const Any & rAny, long & value ) >{ > typedef long __attribute__ ((may_alias)) long_a; > value = * reinterpret_cast< const long_a * >( &rAny.pReserved ); > return true; >} > > >double test(const Any &rAny) >{ > long a; > > rAny >>= a; > > double b; > > rAny >>= b; > > return a+b; >}
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bug 448897
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