https://llvm.org/bugs/show_bug.cgi?id=27741
Bug ID: 27741
Summary: Implement DR 1137 - Real return types for
std::conj(float) and friends
Product: libc++
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: hfin...@anl.gov
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Classification: Unclassified
libc++, unlike libstdc++, does not implement DR 1137, which says that the
return type of std::conj(float) should be float, not std::complex<float>.
inline _LIBCPP_INLINE_VISIBILITY
complex<float>
conj(float __re)
{
return complex<float>(__re);
}
The proposed resolution to DR 1137 was to add:
All of the specified overloads shall have a return type which is the nested
value_type of the effectively cast arguments.
http://lwg.github.io/issues/lwg-defects.html#1137
to 26.4.9, although I don't see that text in the standard itself - I'm not sure
what happened in that regard. libstdc++ has:
// DR 1137.
template<typename _Tp>
inline typename __gnu_cxx::__promote<_Tp>::__type
proj(_Tp __x)
{ return __x; }
template<typename _Tp>
inline typename __gnu_cxx::__promote<_Tp>::__type
conj(_Tp __x)
{ return __x; }
We have code that, as a result of this, compiles with libstdc++, but not with
libc++.
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