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* [gcc(refs/vendors/ibm/heads/perf)] c++: implement C++20 Disambiguating Nested-Requirements (P2092R0)
@ 2020-03-19 5:59 Jiu Fu Guo
0 siblings, 0 replies; only message in thread
From: Jiu Fu Guo @ 2020-03-19 5:59 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:117baab87711553e36074f624861c2d034af8b6c
commit 117baab87711553e36074f624861c2d034af8b6c
Author: Jason Merrill <jason@redhat.com>
Date: Fri Feb 28 17:39:42 2020 -0500
c++: implement C++20 Disambiguating Nested-Requirements (P2092R0)
The rule change in the title matches GCC's current behavior, so no change
was needed. But the paper also makes 'typename' optional in a
requirement-parameter-list, so this implements that.
gcc/cp/ChangeLog
2020-02-28 Jason Merrill <jason@redhat.com>
Implement P2092R0, Disambiguating Nested-Requirements
* parser.c (cp_parser_requirement_parameter_list): Pass
CP_PARSER_FLAGS_TYPENAME_OPTIONAL.
Diff:
---
gcc/cp/ChangeLog | 4 ++++
gcc/cp/parser.c | 4 ++--
gcc/testsuite/g++.dg/cpp2a/concepts-p2092.C | 8 ++++++++
3 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 8a8de3237cd..4c87bde5d1c 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,5 +1,9 @@
2020-02-28 Jason Merrill <jason@redhat.com>
+ Implement P2092R0, Disambiguating Nested-Requirements
+ * parser.c (cp_parser_requirement_parameter_list): Pass
+ CP_PARSER_FLAGS_TYPENAME_OPTIONAL.
+
* call.c (build_user_type_conversion_1): Don't look at the second
conversion of a non-viable candidate.
diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index ca85d899427..24f71671469 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -27716,8 +27716,8 @@ cp_parser_requirement_parameter_list (cp_parser *parser)
if (!parens.require_open (parser))
return error_mark_node;
- tree parms
- = cp_parser_parameter_declaration_clause (parser, CP_PARSER_FLAGS_NONE);
+ tree parms = (cp_parser_parameter_declaration_clause
+ (parser, CP_PARSER_FLAGS_TYPENAME_OPTIONAL));
if (!parens.require_close (parser))
return error_mark_node;
diff --git a/gcc/testsuite/g++.dg/cpp2a/concepts-p2092.C b/gcc/testsuite/g++.dg/cpp2a/concepts-p2092.C
new file mode 100644
index 00000000000..f293581a75a
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/concepts-p2092.C
@@ -0,0 +1,8 @@
+// P2092R0
+// { dg-do compile { target concepts } }
+
+template <class T>
+concept Bar = requires (T::type t) { ++t; };
+
+template <class T>
+concept Foo = requires { requires { T(); }; }; // { dg-error "" }
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