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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.
This commit is contained in:
Patrick Palka 2022-01-27 14:34:05 -05:00
parent 7eb61a45a1
commit fd59d5d4a2
2 changed files with 34 additions and 0 deletions
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17
gcc/testsuite/g++.dg/cpp1z/class-deduction104.C Normal file
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// 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>;

17
gcc/testsuite/g++.dg/cpp1z/class-deduction105.C Normal file
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// 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;