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72 lines
2.1 KiB
Diff
72 lines
2.1 KiB
Diff
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From 6384e940a6db379b0524465cf6cbbd0996b48485 Mon Sep 17 00:00:00 2001
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From: Jason Merrill <jason@redhat.com>
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Date: Tue, 18 May 2021 12:06:36 -0400
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Subject: [PATCH] c++: "perfect" implicitly deleted move [PR100644]
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Here we were ignoring the template constructor because the implicit move
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constructor had all perfect conversions. But CWG1402 says that an
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implicitly deleted move constructor is ignored by overload resolution; we
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implement that instead by preferring any other candidate in joust, to get
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better diagnostics, but that means we need to handle that case here as well.
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gcc/cp/ChangeLog:
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PR c++/100644
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* call.c (perfect_candidate_p): An implicitly deleted move
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is not perfect.
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gcc/testsuite/ChangeLog:
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* g++.dg/cpp0x/implicit-delete1.C: New test.
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---
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gcc/cp/call.c | 5 +++++
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gcc/testsuite/g++.dg/cpp0x/implicit-delete1.C | 20 +++++++++++++++++++
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2 files changed, 25 insertions(+)
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create mode 100644 gcc/testsuite/g++.dg/cpp0x/implicit-delete1.C
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diff --git a/gcc/cp/call.c b/gcc/cp/call.c
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index 678e120a165..d0d55fcbb0b 100644
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--- a/gcc/gcc/cp/call.c
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+++ b/gcc/gcc/cp/call.c
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@@ -5892,6 +5892,11 @@ perfect_candidate_p (z_candidate *cand)
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{
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if (cand->viable < 1)
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return false;
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+ /* CWG1402 makes an implicitly deleted move op worse than other
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+ candidates. */
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+ if (DECL_DELETED_FN (cand->fn) && DECL_DEFAULTED_FN (cand->fn)
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+ && move_fn_p (cand->fn))
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+ return false;
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int len = cand->num_convs;
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for (int i = 0; i < len; ++i)
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if (!perfect_conversion_p (cand->convs[i]))
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diff --git a/gcc/testsuite/g++.dg/cpp0x/implicit-delete1.C b/gcc/testsuite/g++.dg/cpp0x/implicit-delete1.C
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new file mode 100644
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index 00000000000..6dcced4fb2d
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--- /dev/null
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+++ b/gcc/gcc/testsuite/g++.dg/cpp0x/implicit-delete1.C
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@@ -0,0 +1,20 @@
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+// PR c++/100644
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+// { dg-do compile { target c++11 } }
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+
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+struct NonMovable {
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+ NonMovable(NonMovable&&) = delete;
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+};
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+
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+template <class T>
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+struct Maybe {
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+ NonMovable mMember;
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+
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+ template <typename U>
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+ Maybe(Maybe<U>&&);
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+};
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+
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+void foo(Maybe<int>);
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+
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+void unlucky(Maybe<int>&& x) {
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+ Maybe<int> var{(Maybe<int>&&)x};
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+}
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--
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2.27.0
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