* [pushed] c++: template conversion op [PR101698]
@ 2022-04-14 0:24 Jason Merrill
0 siblings, 0 replies; only message in thread
From: Jason Merrill @ 2022-04-14 0:24 UTC (permalink / raw)
To: gcc-patches
Asking for conversion to a dependent type also makes a BASELINK dependent.
Tested x86_64-pc-linux-gnu, applying to trunk.
PR c++/101698
gcc/cp/ChangeLog:
* pt.cc (tsubst_baselink): Also check dependent optype.
gcc/testsuite/ChangeLog:
* g++.dg/template/conv19.C: New test.
---
gcc/cp/pt.cc | 3 ++-
gcc/testsuite/g++.dg/template/conv19.C | 34 ++++++++++++++++++++++++++
2 files changed, 36 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/g++.dg/template/conv19.C
diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc
index 84712e6fc2f..63c08706377 100644
--- a/gcc/cp/pt.cc
+++ b/gcc/cp/pt.cc
@@ -16470,7 +16470,8 @@ tsubst_baselink (tree baselink, tree object_type,
tree binfo_type = BINFO_TYPE (BASELINK_BINFO (baselink));
binfo_type = tsubst (binfo_type, args, complain, in_decl);
- bool dependent_p = binfo_type != BINFO_TYPE (BASELINK_BINFO (baselink));
+ bool dependent_p = (binfo_type != BINFO_TYPE (BASELINK_BINFO (baselink))
+ || optype != BASELINK_OPTYPE (baselink));
if (dependent_p)
{
diff --git a/gcc/testsuite/g++.dg/template/conv19.C b/gcc/testsuite/g++.dg/template/conv19.C
new file mode 100644
index 00000000000..7a3da939c1f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/conv19.C
@@ -0,0 +1,34 @@
+// PR c++/101698
+// { dg-do compile { target c++11 } }
+
+class Base {
+ public:
+ template <class T>
+ operator const T&() const = delete;
+
+ virtual operator const int&() const {
+ static int res;
+ return res;
+ }
+};
+
+template <class T>
+class Derive : public Base {
+ public:
+ operator const T&() const override {
+ using Y = int;
+ //static_assert(__is_same_as(T,Y), "");
+
+ static int res;
+
+ res = Base::operator const Y&(); // OK
+ res = Base::operator const T&(); // { dg-bogus "deleted" }
+ return res;
+ }
+};
+
+int main() {
+ Derive<int> a;
+ const int& b = a;
+ (void)b;
+}
base-commit: ad8161e6d7b26d690d90069ae9a129e7ac36892a
--
2.27.0
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