public inbox for gcc-cvs@sourceware.org
help / color / mirror / Atom feed
* [gcc r12-2378] c++: alias CTAD in unevaluated context [PR101233]
@ 2021-07-16 20:21 Patrick Palka
0 siblings, 0 replies; only message in thread
From: Patrick Palka @ 2021-07-16 20:21 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:a8b3861496bffae8b813ea196c1c5b27f79fbe69
commit r12-2378-ga8b3861496bffae8b813ea196c1c5b27f79fbe69
Author: Patrick Palka <ppalka@redhat.com>
Date: Fri Jul 16 16:21:13 2021 -0400
c++: alias CTAD in unevaluated context [PR101233]
This is the alias CTAD version of the CTAD bug PR93248, and the fix is
the same: clear cp_unevaluated_operand so that the entire chain of
DECL_ARGUMENTS gets substituted.
PR c++/101233
gcc/cp/ChangeLog:
* pt.c (alias_ctad_tweaks): Clear cp_unevaluated_operand for
substituting DECL_ARGUMENTS.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/class-deduction-alias10.C: New test.
Diff:
---
gcc/cp/pt.c | 8 +++++++-
gcc/testsuite/g++.dg/cpp2a/class-deduction-alias10.C | 10 ++++++++++
2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index c7bf7d412ca..94ca3bc633e 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -29097,7 +29097,13 @@ alias_ctad_tweaks (tree tmpl, tree uguides)
/* Substitute the deduced arguments plus the rewritten template
parameters into f to get g. This covers the type, copyness,
guideness, and explicit-specifier. */
- tree g = tsubst_decl (DECL_TEMPLATE_RESULT (f), targs, complain);
+ tree g;
+ {
+ /* Parms are to have DECL_CHAIN tsubsted, which would be skipped
+ if cp_unevaluated_operand. */
+ cp_evaluated ev;
+ g = tsubst_decl (DECL_TEMPLATE_RESULT (f), targs, complain);
+ }
if (g == error_mark_node)
continue;
DECL_USE_TEMPLATE (g) = 0;
diff --git a/gcc/testsuite/g++.dg/cpp2a/class-deduction-alias10.C b/gcc/testsuite/g++.dg/cpp2a/class-deduction-alias10.C
new file mode 100644
index 00000000000..a473fff5dc7
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/class-deduction-alias10.C
@@ -0,0 +1,10 @@
+// PR c++/101233
+// { dg-do compile { target c++20 } }
+
+template<class T, class U>
+struct A { A(T, U); };
+
+template<class T, class U>
+using B = A<U, T>;
+
+using type = decltype(B{0, 0});
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2021-07-16 20:21 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-07-16 20:21 [gcc r12-2378] c++: alias CTAD in unevaluated context [PR101233] Patrick Palka
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).