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* [gcc r12-6896] c++: constrained partial spec using qualified name [PR92944, PR103678]
@ 2022-01-27 16:02 Patrick Palka
0 siblings, 0 replies; only message in thread
From: Patrick Palka @ 2022-01-27 16:02 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:ce6054a22ae14594a2919d2ad87cd9478e616fb3
commit r12-6896-gce6054a22ae14594a2919d2ad87cd9478e616fb3
Author: Patrick Palka <ppalka@redhat.com>
Date: Thu Jan 27 10:56:34 2022 -0500
c++: constrained partial spec using qualified name [PR92944, PR103678]
In the nested_name_specifier branch within cp_parser_class_head, we need
to update 'type' with the result of maybe_process_partial_specialization
like we do in the template_id_p branch.
PR c++/92944
PR c++/103678
gcc/cp/ChangeLog:
* parser.cc (cp_parser_class_head): Update 'type' with the result
of maybe_process_partial_specialization in the
nested_name_specifier branch. Refactor nearby code to accomodate
that maybe_process_partial_specialization returns a _TYPE, not a
TYPE_DECL, and eliminate local variable 'class_type' in passing.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/concepts-partial-spec10.C: New test.
* g++.dg/cpp2a/concepts-partial-spec11.C: New test.
Diff:
---
gcc/cp/parser.cc | 18 +++++++-----------
gcc/testsuite/g++.dg/cpp2a/concepts-partial-spec10.C | 17 +++++++++++++++++
gcc/testsuite/g++.dg/cpp2a/concepts-partial-spec11.C | 19 +++++++++++++++++++
3 files changed, 43 insertions(+), 11 deletions(-)
diff --git a/gcc/cp/parser.cc b/gcc/cp/parser.cc
index 8b38165020f..f1947ee3a1c 100644
--- a/gcc/cp/parser.cc
+++ b/gcc/cp/parser.cc
@@ -26535,7 +26535,7 @@ cp_parser_class_head (cp_parser* parser,
}
else if (nested_name_specifier)
{
- tree class_type;
+ type = TREE_TYPE (type);
/* Given:
@@ -26545,31 +26545,27 @@ cp_parser_class_head (cp_parser* parser,
we will get a TYPENAME_TYPE when processing the definition of
`S::T'. We need to resolve it to the actual type before we
try to define it. */
- if (TREE_CODE (TREE_TYPE (type)) == TYPENAME_TYPE)
+ if (TREE_CODE (type) == TYPENAME_TYPE)
{
- class_type = resolve_typename_type (TREE_TYPE (type),
- /*only_current_p=*/false);
- if (TREE_CODE (class_type) != TYPENAME_TYPE)
- type = TYPE_NAME (class_type);
- else
+ type = resolve_typename_type (type, /*only_current_p=*/false);
+ if (TREE_CODE (type) == TYPENAME_TYPE)
{
cp_parser_error (parser, "could not resolve typename type");
type = error_mark_node;
}
}
- if (maybe_process_partial_specialization (TREE_TYPE (type))
- == error_mark_node)
+ type = maybe_process_partial_specialization (type);
+ if (type == error_mark_node)
{
type = NULL_TREE;
goto done;
}
- class_type = current_class_type;
/* Enter the scope indicated by the nested-name-specifier. */
pushed_scope = push_scope (nested_name_specifier);
/* Get the canonical version of this type. */
- type = TYPE_MAIN_DECL (TREE_TYPE (type));
+ type = TYPE_MAIN_DECL (type);
/* Call push_template_decl if it seems like we should be defining a
template either from the template headers or the type we're
defining, so that we diagnose both extra and missing headers. */
diff --git a/gcc/testsuite/g++.dg/cpp2a/concepts-partial-spec10.C b/gcc/testsuite/g++.dg/cpp2a/concepts-partial-spec10.C
new file mode 100644
index 00000000000..d45a1b03e89
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/concepts-partial-spec10.C
@@ -0,0 +1,17 @@
+// PR c++/92944
+// { dg-do compile { target c++20 } }
+
+namespace ns { template<class T> struct A { }; }
+
+template<class T> requires true struct ns::A<T> { using type = T; };
+template<class T> requires false struct ns::A<T> { };
+
+template<class T> struct ns::A<T*> { };
+template<class T> requires true struct ns::A<T*> { using type = T; };
+template<class T> requires false struct ns::A<T*> { };
+
+using ty1 = ns::A<int>::type;
+using ty1 = int;
+
+using ty2 = ns::A<int*>::type;
+using ty2 = int;
diff --git a/gcc/testsuite/g++.dg/cpp2a/concepts-partial-spec11.C b/gcc/testsuite/g++.dg/cpp2a/concepts-partial-spec11.C
new file mode 100644
index 00000000000..03334500238
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/concepts-partial-spec11.C
@@ -0,0 +1,19 @@
+// PR c++/103678
+// { dg-do compile { target c++20 } }
+
+template<class>
+struct A {
+ template<class...>
+ struct B;
+};
+
+template<class A_t>
+template<class B_t>
+struct A<A_t>::B<B_t> {};
+
+template<class A_t>
+template<class B_t>
+requires requires {
+ typename B_t;
+}
+struct A<A_t>::B<B_t> {};
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