67 lines
2.7 KiB
C++
67 lines
2.7 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify %s
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struct A {};
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// See if aliasing can confuse this baby.
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typedef char c;
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typedef c *cp;
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typedef cp *cpp;
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typedef cpp *cppp;
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typedef cppp &cpppr;
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typedef const cppp &cpppcr;
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typedef const char cc;
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typedef cc *ccp;
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typedef volatile ccp ccvp;
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typedef ccvp *ccvpp;
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typedef const volatile ccvpp ccvpcvp;
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typedef ccvpcvp *ccvpcvpp;
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typedef int iar[100];
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typedef iar &iarr;
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typedef int (*f)(int);
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char ***good_const_cast_test(ccvpcvpp var)
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{
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// Cast away deep consts and volatiles.
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char ***var2 = const_cast<cppp>(var);
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char ***const &var3 = var2;
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// Const reference to reference.
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char ***&var4 = const_cast<cpppr>(var3);
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// Drop reference. Intentionally without qualifier change.
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char *** var5 = const_cast<cppp>(var4);
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// Const array to array reference.
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const int ar[100] = {0};
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int (&rar)[100] = const_cast<iarr>(ar);
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// Array decay. Intentionally without qualifier change.
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int *pi = const_cast<int*>(ar);
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f fp = 0;
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// Don't misidentify fn** as a function pointer.
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f *fpp = const_cast<f*>(&fp);
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int const A::* const A::*icapcap = 0;
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int A::* A::* iapap = const_cast<int A::* A::*>(icapcap);
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(void)const_cast<A&&>(A()); // expected-warning {{C++11}}
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return var4;
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}
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short *bad_const_cast_test(char const *volatile *const volatile *var)
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{
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// Different pointer levels.
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char **var2 = const_cast<char**>(var); // expected-error {{const_cast from 'const char *volatile *const volatile *' to 'char **' is not allowed}}
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// Different final type.
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short ***var3 = const_cast<short***>(var); // expected-error {{const_cast from 'const char *volatile *const volatile *' to 'short ***' is not allowed}}
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// Rvalue to reference.
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char ***&var4 = const_cast<cpppr>(&var2); // expected-error {{const_cast from rvalue to reference type 'cpppr'}}
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// Non-pointer.
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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}}
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const int *ar[100] = {0};
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// Not even lenient g++ accepts this.
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int *(*rar)[100] = const_cast<int *(*)[100]>(&ar); // expected-error {{const_cast from 'const int *(*)[100]' to 'int *(*)[100]' is not allowed}}
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f fp1 = 0;
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// Function pointers.
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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}}
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void (A::*mfn)() = 0;
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(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}}
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(void)const_cast<int&&>(0); // expected-error {{const_cast from rvalue to reference type 'int &&'}} expected-warning {{C++11}}
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return **var3;
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}
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