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From: Jason Merrill <jason@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r11-9994] c++: template conversion op [PR101698] Date: Fri, 13 May 2022 16:28:28 +0000 (GMT) [thread overview] Message-ID: <20220513162828.F0CC9385141E@sourceware.org> (raw) https://gcc.gnu.org/g:5c6577dcf1d413582775063c905d917e21bf0eba commit r11-9994-g5c6577dcf1d413582775063c905d917e21bf0eba Author: Jason Merrill <jason@redhat.com> Date: Wed Apr 13 14:49:04 2022 -0400 c++: template conversion op [PR101698] Asking for conversion to a dependent type also makes a BASELINK dependent. PR c++/101698 gcc/cp/ChangeLog: * pt.c (tsubst_baselink): Also check dependent optype. gcc/testsuite/ChangeLog: * g++.dg/template/conv19.C: New test. Diff: --- gcc/cp/pt.c | 3 ++- gcc/testsuite/g++.dg/template/conv19.C | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 36 insertions(+), 1 deletion(-) diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c index f5154418594..ec8bf229740 100644 --- a/gcc/cp/pt.c +++ b/gcc/cp/pt.c @@ -16417,7 +16417,8 @@ 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; +}
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