xref: /llvm-project/clang/test/AST/deduction-guides.cpp (revision 7c1d9b15eee3a34678addab2bab66f3020ac0753)
1 // Test without serialization:
2 // RUN: %clang_cc1 %s -ast-dump -std=c++17 | FileCheck %s
3 //
4 // Test with serialization:
5 // RUN: %clang_cc1 -std=c++17 -emit-pch -o %t %s
6 // RUN: %clang_cc1 -x c++ -std=c++17 -include-pch %t -ast-dump-all /dev/null \
7 // RUN: | sed -e "s/ <undeserialized declarations>//" -e "s/ imported//" \
8 // RUN: | FileCheck %s
9 
10 namespace PR46111 {
11 template <typename>
12 struct S;
13 
14 template <typename T>
15 struct HasDeductionGuide {
16   typedef PR46111::S<T> STy;
17   HasDeductionGuide(typename STy::Child);
18 };
19 
20 // This causes deduction guides to be generated for all constructors.
21 HasDeductionGuide()->HasDeductionGuide<int>;
22 
23 template <typename T>
24 struct HasDeductionGuideTypeAlias {
25   using STy = PR46111::S<T>;
26   HasDeductionGuideTypeAlias(typename STy::Child);
27 };
28 
29 // This causes deduction guides to be generated for all constructors.
30 HasDeductionGuideTypeAlias()->HasDeductionGuideTypeAlias<int>;
31 
32 // The parameter to this one shouldn't be an elaborated type.
33 // CHECK: CXXDeductionGuideDecl {{.*}} implicit <deduction guide for HasDeductionGuide> 'auto (typename STy::Child) -> HasDeductionGuide<T>'
34 // CHECK: CXXDeductionGuideDecl {{.*}} implicit <deduction guide for HasDeductionGuide> 'auto (HasDeductionGuide<T>) -> HasDeductionGuide<T>'
35 // CHECK: CXXDeductionGuideDecl {{.*}} <deduction guide for HasDeductionGuide> 'auto () -> HasDeductionGuide<int>'
36 // CHECK: CXXDeductionGuideDecl {{.*}} implicit <deduction guide for HasDeductionGuideTypeAlias> 'auto (typename STy::Child) -> HasDeductionGuideTypeAlias<T>'
37 // CHECK: CXXDeductionGuideDecl {{.*}} implicit <deduction guide for HasDeductionGuideTypeAlias> 'auto (HasDeductionGuideTypeAlias<T>) -> HasDeductionGuideTypeAlias<T>'
38 // CHECK: CXXDeductionGuideDecl {{.*}} <deduction guide for HasDeductionGuideTypeAlias> 'auto () -> HasDeductionGuideTypeAlias<int>'
39 } // namespace PR46111
40 
41 
42 namespace PR48177 {
43   template <class A> struct Base {
44     using type_alias = A;
45   };
46   template<class T, int S, class A>
47   struct Derived : Base<A> {
48     using type_alias = typename Derived::type_alias;
49     Derived(Derived &&, typename Derived::type_alias const&);
50     Derived(T);
51   };
52 
53   template<class T, class A>
54   Derived(T, A) -> Derived<T, 1, A>;
55 
init()56   void init() {
57     Derived d {1,2};
58   }
59 } // namespace PR48177
60 
61 // CHECK: CXXRecordDecl {{.*}} struct Derived
62 // CHECK: TypeAliasDecl {{.*}} type_alias 'typename Derived<T, S, A>::type_alias'
63 // CHECK-NEXT: DependentNameType {{.*}} 'typename Derived<T, S, A>::type_alias' dependent
64 
65 // CHECK: CXXRecordDecl {{.*}} struct Derived
66 // CHECK: TypeAliasDecl {{.*}} type_alias 'typename Derived<int, 1, int>::type_alias':'int'
67 // CHECK-NEXT: ElaboratedType {{.*}} 'typename Derived<int, 1, int>::type_alias' sugar
68 // CHECK-NEXT: TypedefType {{.*}} 'PR48177::Base<int>::type_alias' sugar
69 // CHECK-NEXT: TypeAlias {{.*}} 'type_alias'
70 // CHECK-NEXT: SubstTemplateTypeParmType {{.*}} 'int' sugar class depth 0 index 0 A
71 // CHECK-NEXT: ClassTemplateSpecialization {{.*}} 'Base'
72 // CHECK-NEXT: BuiltinType {{.*}} 'int'
73 
74 // CHECK: CXXDeductionGuideDecl {{.*}} implicit <deduction guide for Derived> 'auto (Derived<T, S, A> &&, const typename Derived<T, S, A>::type_alias &) -> Derived<T, S, A>'
75 // CHECK: CXXDeductionGuideDecl {{.*}} implicit <deduction guide for Derived> 'auto (T) -> Derived<T, S, A>'
76 // CHECK: CXXDeductionGuideDecl {{.*}} implicit <deduction guide for Derived> 'auto (Derived<T, S, A>) -> Derived<T, S, A>'
77 // CHECK: CXXDeductionGuideDecl {{.*}} <deduction guide for Derived> 'auto (T, A) -> Derived<T, 1, A>'
78 // CHECK: CXXDeductionGuideDecl {{.*}} <deduction guide for Derived> 'auto (int, int) -> Derived<int, 1, int>'
79