diff options
| author | Richard Smith <richard-llvm@metafoo.co.uk> | 2016-10-21 22:00:42 +0000 |
|---|---|---|
| committer | Richard Smith <richard-llvm@metafoo.co.uk> | 2016-10-21 22:00:42 +0000 |
| commit | 4b6ad14285f3e1f1e47202c610bbef638d3a948d (patch) | |
| tree | c2a4efa94d290019bf062664d5deac438f634608 /www | |
| parent | a663b0aee8fef8552996f03415d3e48ee72e838f (diff) | |
DR583, DR1512: Implement a rewrite to C++'s 'composite pointer type' rules.
This has two significant effects:
1) Direct relational comparisons between null pointer constants (0 and nullopt)
and pointers are now ill-formed. This was always the case for C, and it
appears that C++ only ever permitted by accident. For instance, cases like
nullptr < &a
are now rejected.
2) Comparisons and conditional operators between differently-cv-qualified
pointer types now work, and produce a composite type that both source
pointer types can convert to (when possible). For instance, comparison
between 'int **' and 'const int **' is now valid, and uses an intermediate
type of 'const int *const *'.
Clang previously supported #2 as an extension.
We do not accept the cases in #1 as an extension. I've tested a fair amount of
code to check that this doesn't break it, but if it turns out that someone is
relying on this, we can easily add it back as an extension.
This is a re-commit of r284800.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@284890 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'www')
| -rw-r--r-- | www/cxx_dr_status.html | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/www/cxx_dr_status.html b/www/cxx_dr_status.html index 73238b4d53..1385ec3398 100644 --- a/www/cxx_dr_status.html +++ b/www/cxx_dr_status.html @@ -3541,7 +3541,7 @@ and <I>POD class</I></td> <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#583">583</a></td> <td>CD3</td> <td>Relational pointer comparisons against the null pointer constant</td> - <td class="none" align="center">No</td> + <td class="svn" align="center">SVN</td> </tr> <tr id="584"> <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_closed.html#584">584</a></td> @@ -8887,7 +8887,7 @@ and <I>POD class</I></td> <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1512">1512</a></td> <td>CD3</td> <td>Pointer comparison vs qualification conversions</td> - <td class="none" align="center">Unknown</td> + <td class="svn" align="center">SVN</td> </tr> <tr class="open" id="1513"> <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#1513">1513</a></td> |