https://llvm.org/bugs/show_bug.cgi?id=26109
Bug ID: 26109
Summary: is_same<const const char*, const char*>::value ==
false
Product: libc++
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: dan.el...@gmail.com
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Classification: Unclassified
I'm using libc++ from the trusty/universe repo:
libc++1_1.0~svn199600-1_amd64.deb
is_same is used by unordered_map in a static assert to check that the
allocator::value_type is the same as the map value_type. The problem is the map
defines value_type as pair<const Key, Value>. If Key was already a const type
(const char *) in this case, somehow it gets double const qualified and is_same
fails. If however, I make a typedef of const char* as CString and then define
the allocator type as pair<const CString, Value> the is_same check passes.
This seems like a bug to me, double const qualifiers should be ignored by
is_same, right? I'm not sure what other compilers do.
I hope I reported the bug in the right place, it could well be clang issue.
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