From: Patrick Palka <ppalka@redhat.com>
Date: Thu, 27 Jan 2022 19:34:05 +0000 (-0500)
Subject: c++: Add a couple of CTAD testcases [PR82632]
X-Git-Tag: basepoints/gcc-13~1412
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fd59d5d4a2ef8a97541a22399480bc1f8e82ceca;p=thirdparty%2Fgcc.git

c++: Add a couple of CTAD testcases [PR82632]

	PR c++/82632

gcc/testsuite/ChangeLog:

	* g++.dg/cpp1z/class-deduction104.C: New test.
	* g++.dg/cpp1z/class-deduction105.C: New test.
---

diff --git a/gcc/testsuite/g++.dg/cpp1z/class-deduction104.C b/gcc/testsuite/g++.dg/cpp1z/class-deduction104.C
new file mode 100644
index 000000000000..a34dea04675a
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp1z/class-deduction104.C
@@ -0,0 +1,17 @@
+// PR c++/82632
+// { dg-do compile { target c++17 } }
+
+template<class T> struct Optional {
+  template<class U> Optional(U&&);
+};
+
+template<class A> Optional(A) -> Optional<A>;
+
+Optional opt(1729);
+Optional dupe(opt);
+
+using ty1 = decltype(opt);
+using ty1 = Optional<int>;
+
+using ty2 = decltype(dupe);
+using ty2 = Optional<int>;
diff --git a/gcc/testsuite/g++.dg/cpp1z/class-deduction105.C b/gcc/testsuite/g++.dg/cpp1z/class-deduction105.C
new file mode 100644
index 000000000000..73a9c6b676a7
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp1z/class-deduction105.C
@@ -0,0 +1,17 @@
+// PR c++/82632
+// { dg-do compile { target c++17 } }
+
+template<class T, int = 1>
+struct Foo {
+  Foo() = default;
+  Foo(const Foo&) = delete;
+
+  template<int I>
+  Foo(const Foo<T, I>&);
+};
+
+template<class T, int I>
+Foo(Foo<T,I>) -> Foo<T,I+1>;
+
+Foo<int> a;
+Foo b = a;