1 // RUN: %clang_cc1 -fsyntax-only -verify %s 2 3 struct A {}; 4 5 // See if aliasing can confuse this baby. 6 typedef char c; 7 typedef c *cp; 8 typedef cp *cpp; 9 typedef cpp *cppp; 10 typedef cppp &cpppr; 11 typedef const cppp &cpppcr; 12 typedef const char cc; 13 typedef cc *ccp; 14 typedef volatile ccp ccvp; 15 typedef ccvp *ccvpp; 16 typedef const volatile ccvpp ccvpcvp; 17 typedef ccvpcvp *ccvpcvpp; 18 typedef int iar[100]; 19 typedef iar &iarr; 20 typedef int (*f)(int); 21 22 char ***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 46 short *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 {{const_cast to 'void (A::*)()', 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
