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