p25-0x.cpp revision ac71351acdefc9de0c770c1d717e621ac9e684bf 
1// RUN: %clang_cc1 -std=c++11 -verify %s
2
3template<typename T, bool B> struct trivially_assignable_check {
4  static_assert(B == __has_trivial_assign(T), "");
5  static_assert(B == __is_trivially_assignable(T&, T), "");
6  static_assert(B == __is_trivially_assignable(T&, const T &), "");
7  static_assert(B == __is_trivially_assignable(T&, T &&), "");
8  static_assert(B == __is_trivially_assignable(T&&, T), "");
9  static_assert(B == __is_trivially_assignable(T&&, const T &), "");
10  static_assert(B == __is_trivially_assignable(T&&, T &&), "");
11  typedef void type;
12};
13template<typename T> using trivially_assignable =
14  typename trivially_assignable_check<T, true>::type;
15template<typename T> using not_trivially_assignable =
16  typename trivially_assignable_check<T, false>::type;
17
18struct Trivial {};
19using _ = trivially_assignable<Trivial>;
20
21// A copy/move assignment operator for class X is trivial if it is not user-provided,
22struct UserProvided {
23  UserProvided &operator=(const UserProvided &);
24};
25using _ = not_trivially_assignable<UserProvided>;
26
27// its declared parameter type is the same as if it had been implicitly
28// declared,
29struct NonConstCopy {
30  NonConstCopy &operator=(NonConstCopy &) = default;
31};
32using _ = not_trivially_assignable<NonConstCopy>;
33
34// class X has no virtual functions
35struct VFn {
36  virtual void f();
37};
38using _ = not_trivially_assignable<VFn>;
39
40// and no virtual base classes
41struct VBase : virtual Trivial {};
42using _ = not_trivially_assignable<VBase>;
43
44// and the assignment operator selected to copy/move each [direct subobject] is trivial
45struct TemplateCtor {
46  template<typename T> TemplateCtor operator=(T &);
47};
48using _ = trivially_assignable<TemplateCtor>;
49struct TemplateCtorMember {
50  TemplateCtor tc;
51};
52using _ = trivially_assignable<TemplateCtorMember>;
53struct MutableTemplateCtorMember {
54  mutable TemplateCtor mtc;
55};
56// FIXME: This is wrong! The "trivial" copy constructor calls the templated
57//        constructor for the mutable member.
58static_assert(!__is_trivially_assignable(MutableTemplateCtorMember, const MutableTemplateCtorMember &), ""); // expected-error {{}}
59static_assert(__is_trivially_assignable(MutableTemplateCtorMember, MutableTemplateCtorMember &&), "");
60
61// Both trivial and non-trivial special members.
62struct TNT {
63  TNT &operator=(const TNT &) = default; // trivial
64  TNT &operator=(TNT &); // non-trivial
65
66  TNT &operator=(TNT &&) = default; // trivial
67  TNT &operator=(const TNT &&); // non-trivial
68};
69
70static_assert(!__has_trivial_assign(TNT), "lie deliberately for gcc compatibility");
71static_assert(__is_trivially_assignable(TNT, TNT), "");
72static_assert(!__is_trivially_assignable(TNT, TNT &), "");
73static_assert(__is_trivially_assignable(TNT, const TNT &), "");
74static_assert(!__is_trivially_assignable(TNT, volatile TNT &), "");
75static_assert(__is_trivially_assignable(TNT, TNT &&), "");
76static_assert(!__is_trivially_assignable(TNT, const TNT &&), "");
77static_assert(!__is_trivially_assignable(TNT, volatile TNT &&), "");
78
79// This has only trivial special members.
80struct DerivedFromTNT : TNT {};
81
82static_assert(__has_trivial_assign(DerivedFromTNT), "");
83static_assert(__is_trivially_assignable(DerivedFromTNT, DerivedFromTNT), "");
84static_assert(__is_trivially_assignable(DerivedFromTNT, DerivedFromTNT &), "");
85static_assert(__is_trivially_assignable(DerivedFromTNT, const DerivedFromTNT &), "");
86static_assert(!__is_trivially_assignable(DerivedFromTNT, volatile DerivedFromTNT &), "");
87static_assert(__is_trivially_assignable(DerivedFromTNT, DerivedFromTNT &&), "");
88static_assert(__is_trivially_assignable(DerivedFromTNT, const DerivedFromTNT &&), "");
89static_assert(!__is_trivially_assignable(DerivedFromTNT, volatile DerivedFromTNT &&), "");
90
91// This has only trivial special members.
92struct TNTMember {
93  TNT tnt;
94};
95
96static_assert(__has_trivial_assign(TNTMember), "");
97static_assert(__is_trivially_assignable(TNTMember, TNTMember), "");
98static_assert(__is_trivially_assignable(TNTMember, TNTMember &), "");
99static_assert(__is_trivially_assignable(TNTMember, const TNTMember &), "");
100static_assert(!__is_trivially_assignable(TNTMember, volatile TNTMember &), "");
101static_assert(__is_trivially_assignable(TNTMember, TNTMember &&), "");
102static_assert(__is_trivially_assignable(TNTMember, const TNTMember &&), "");
103static_assert(!__is_trivially_assignable(TNTMember, volatile TNTMember &&), "");
104
105struct NCCTNT : NonConstCopy, TNT {};
106
107static_assert(!__has_trivial_assign(NCCTNT), "");
108static_assert(!__is_trivially_assignable(NCCTNT, NCCTNT), "");
109static_assert(!__is_trivially_assignable(NCCTNT, NCCTNT &), "");
110static_assert(!__is_trivially_assignable(NCCTNT, const NCCTNT &), "");
111static_assert(!__is_trivially_assignable(NCCTNT, volatile NCCTNT &), "");
112static_assert(!__is_trivially_assignable(NCCTNT, NCCTNT &&), "");
113static_assert(!__is_trivially_assignable(NCCTNT, const NCCTNT &&), "");
114static_assert(!__is_trivially_assignable(NCCTNT, volatile NCCTNT &&), "");
115
116struct MultipleTrivial {
117  // All four of these are trivial.
118  MultipleTrivial &operator=(const MultipleTrivial &) & = default;
119  MultipleTrivial &operator=(const MultipleTrivial &) && = default;
120  MultipleTrivial &operator=(MultipleTrivial &&) & = default;
121  MultipleTrivial &operator=(MultipleTrivial &&) && = default;
122};
123
124using _ = trivially_assignable<MultipleTrivial>;
125
126struct RefQualifier {
127  RefQualifier &operator=(const RefQualifier &) & = default;
128  RefQualifier &operator=(const RefQualifier &) &&;
129  RefQualifier &operator=(RefQualifier &&) &;
130  RefQualifier &operator=(RefQualifier &&) && = default;
131};
132struct DerivedFromRefQualifier : RefQualifier {
133  // Both of these call the trivial copy operation.
134  DerivedFromRefQualifier &operator=(const DerivedFromRefQualifier &) & = default;
135  DerivedFromRefQualifier &operator=(const DerivedFromRefQualifier &) && = default;
136  // Both of these call the non-trivial move operation.
137  DerivedFromRefQualifier &operator=(DerivedFromRefQualifier &&) & = default;
138  DerivedFromRefQualifier &operator=(DerivedFromRefQualifier &&) && = default;
139};
140static_assert(__is_trivially_assignable(DerivedFromRefQualifier&, const DerivedFromRefQualifier&), "");
141static_assert(__is_trivially_assignable(DerivedFromRefQualifier&&, const DerivedFromRefQualifier&), "");
142static_assert(!__is_trivially_assignable(DerivedFromRefQualifier&, DerivedFromRefQualifier&&), "");
143static_assert(!__is_trivially_assignable(DerivedFromRefQualifier&&, DerivedFromRefQualifier&&), "");
144