http://llvm.org/bugs/show_bug.cgi?id=15754
Bug ID: 15754
Summary: addressof returns wrong address when there is user
provided conversion operator to char&
Product: libc++
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
addressof uses plain c style cast, so type conversion operator is invoked when
argument type T has user-defined conversion operator to char& like this:
struct nothing {
operator char&()
{
static char c;
return c;
}
};
one way to fix this is using reinterpret_cast:
http://www.boost.org/doc/libs/release/boost/utility/addressof.hpp
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
_Tp*
addressof(_Tp& __x) _NOEXCEPT
{
return reinterpret_cast<_Tp*>(&const_cast<char&>(reinterpret_cast<const
volatile char&>(__x)));
}
this code adding const volatile to char& and remove it for allowing addressof
to be called with const or volatile type _Tp.
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