From 75ab8b4829dec8c70470e8225c9add964f71ed74 Mon Sep 17 00:00:00 2001 From: Jason Merrill Date: Wed, 19 May 2021 17:33:21 -0400 Subject: [PATCH] c++: _Complex template parameter [PR100634] We were crashing because invalid_nontype_parm_type_p allowed _Complex template parms, but convert_nontype_argument didn't know what to do for them. Let's just disallow it, people can and should use std::complex instead. PR c++/100634 gcc/cp/ChangeLog: * pt.c (invalid_nontype_parm_type_p): Return true for COMPLEX_TYPE. gcc/testsuite/ChangeLog: * g++.dg/cpp2a/nontype-complex1.C: New test. --- gcc/cp/pt.c | 2 ++ gcc/testsuite/g++.dg/cpp2a/nontype-complex1.C | 8 ++++++++ 2 files changed, 10 insertions(+) create mode 100644 gcc/testsuite/g++.dg/cpp2a/nontype-complex1.C diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c index 32cd0b7..cbd2f3d 100644 --- a/gcc/cp/pt.c +++ b/gcc/cp/pt.c @@ -26563,6 +26563,8 @@ invalid_nontype_parm_type_p (tree type, tsubst_flags_t complain) else if (cxx_dialect >= cxx11 && TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM) return false; + else if (TREE_CODE (type) == COMPLEX_TYPE) + /* Fall through. */; else if (VOID_TYPE_P (type)) /* Fall through. */; else if (cxx_dialect >= cxx20) diff --git a/gcc/testsuite/g++.dg/cpp2a/nontype-complex1.C b/gcc/testsuite/g++.dg/cpp2a/nontype-complex1.C new file mode 100644 index 0000000..4de2168 --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp2a/nontype-complex1.C @@ -0,0 +1,8 @@ +// PR c++/100634 +// { dg-do compile { target c++20 } } +// { dg-options "" } + +// We could support _Complex template arguments, but better I think to make +// people use a standard type instead. +template<_Complex int> struct ComplexInt {}; // { dg-error "not a valid type" } +using CI = ComplexInt<1 + 3i>; -- 2.7.4