1// RUN: %clang_cc1 -fsyntax-only -verify %s
2// RUN: %clang_cc1 -fsyntax-only -verify -std=c++98 %s
3// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
4
5struct A {};
6
7// See if aliasing can confuse this baby.
8typedef char c;
9typedef c *cp;
10typedef cp *cpp;
11typedef cpp *cppp;
12typedef cppp &cpppr;
13typedef const cppp &cpppcr;
14typedef const char cc;
15typedef cc *ccp;
16typedef volatile ccp ccvp;
17typedef ccvp *ccvpp;
18typedef const volatile ccvpp ccvpcvp;
19typedef ccvpcvp *ccvpcvpp;
20typedef int iar[100];
21typedef iar &iarr;
22typedef int (*f)(int);
23
24char ***good_const_cast_test(ccvpcvpp var)
25{
26  // Cast away deep consts and volatiles.
27  char ***var2 = const_cast<cppp>(var);
28  char ***const &var3 = var2;
29  // Const reference to reference.
30  char ***&var4 = const_cast<cpppr>(var3);
31  // Drop reference. Intentionally without qualifier change.
32  char *** var5 = const_cast<cppp>(var4);
33  // Const array to array reference.
34  const int ar[100] = {0};
35  int (&rar)[100] = const_cast<iarr>(ar);
36  // Array decay. Intentionally without qualifier change.
37  int *pi = const_cast<int*>(ar);
38  f fp = 0;
39  // Don't misidentify fn** as a function pointer.
40  f *fpp = const_cast<f*>(&fp);
41  int const A::* const A::*icapcap = 0;
42  int A::* A::* iapap = const_cast<int A::* A::*>(icapcap);
43  (void)const_cast<A&&>(A());
44#if __cplusplus <= 199711L // C++03 or earlier modes
45  // expected-warning@-2 {{rvalue references are a C++11 extension}}
46#endif
47  return var4;
48}
49
50short *bad_const_cast_test(char const *volatile *const volatile *var)
51{
52  // Different pointer levels.
53  char **var2 = const_cast<char**>(var); // expected-error {{const_cast from 'const char *volatile *const volatile *' to 'char **' is not allowed}}
54  // Different final type.
55  short ***var3 = const_cast<short***>(var); // expected-error {{const_cast from 'const char *volatile *const volatile *' to 'short ***' is not allowed}}
56  // Rvalue to reference.
57  char ***&var4 = const_cast<cpppr>(&var2); // expected-error {{const_cast from rvalue to reference type 'cpppr'}}
58  // Non-pointer.
59  char v = const_cast<char>(**var2); // expected-error {{const_cast to 'char', which is not a reference, pointer-to-object, or pointer-to-data-member}}
60  const int *ar[100] = {0};
61  // Not even lenient g++ accepts this.
62  int *(*rar)[100] = const_cast<int *(*)[100]>(&ar); // expected-error {{const_cast from 'const int *(*)[100]' to 'int *(*)[100]' is not allowed}}
63  f fp1 = 0;
64  // Function pointers.
65  f fp2 = const_cast<f>(fp1); // expected-error {{const_cast to 'f' (aka 'int (*)(int)'), which is not a reference, pointer-to-object, or pointer-to-data-member}}
66  void (A::*mfn)() = 0;
67  (void)const_cast<void (A::*)()>(mfn); // expected-error-re {{const_cast to 'void (A::*)(){{( __attribute__\(\(thiscall\)\))?}}', which is not a reference, pointer-to-object, or pointer-to-data-member}}
68  (void)const_cast<int&&>(0); // expected-error {{const_cast from rvalue to reference type 'int &&'}}
69#if __cplusplus <= 199711L // C++03 or earlier modes
70  // expected-warning@-2 {{rvalue references are a C++11 extension}}
71#endif
72  return **var3;
73}
74
75template <typename T>
76char *PR21845() { return const_cast<char *>((void)T::x); } // expected-error {{const_cast from 'void' to 'char *' is not allowed}}
77