| // RUN: clang -fsyntax-only -verify %s |
| |
| enum test { testval = 1 }; |
| struct structure { int m; }; |
| typedef void (*fnptr)(); |
| |
| // Test the conversion to self. |
| void self_conversion() |
| { |
| // T*->T* is allowed, T->T in general not. |
| int i = 0; |
| (void)reinterpret_cast<int>(i); // expected-error {{reinterpret_cast from 'int' to 'int' is not allowed}} |
| structure s; |
| (void)reinterpret_cast<structure>(s); // expected-error {{reinterpret_cast from 'struct structure' to 'struct structure' is not allowed}} |
| int *pi = 0; |
| (void)reinterpret_cast<int*>(pi); |
| } |
| |
| // Test conversion between pointer and integral types, as in /3 and /4. |
| void integral_conversion() |
| { |
| void *vp = reinterpret_cast<void*>(testval); |
| long l = reinterpret_cast<long>(vp); |
| (void)reinterpret_cast<float*>(l); |
| fnptr fnp = reinterpret_cast<fnptr>(l); |
| (void)reinterpret_cast<char>(fnp); // expected-error {{cast from pointer to smaller type 'char' loses information}} |
| (void)reinterpret_cast<long>(fnp); |
| } |
| |
| void pointer_conversion() |
| { |
| int *p1 = 0; |
| float *p2 = reinterpret_cast<float*>(p1); |
| structure *p3 = reinterpret_cast<structure*>(p2); |
| typedef int **ppint; |
| ppint *deep = reinterpret_cast<ppint*>(p3); |
| (void)reinterpret_cast<fnptr*>(deep); |
| } |
| |
| void constness() |
| { |
| int ***const ipppc = 0; |
| // Valid: T1* -> T2 const* |
| int const *icp = reinterpret_cast<int const*>(ipppc); |
| // Invalid: T1 const* -> T2* |
| (void)reinterpret_cast<int*>(icp); // expected-error {{reinterpret_cast from 'int const *' to 'int *' casts away constness}} |
| // Invalid: T1*** -> T2 const* const** |
| int const *const **icpcpp = reinterpret_cast<int const* const**>(ipppc); // expected-error {{reinterpret_cast from 'int ***const' to 'int const *const **' casts away constness}} |
| // Valid: T1* -> T2* |
| int *ip = reinterpret_cast<int*>(icpcpp); |
| // Valid: T* -> T const* |
| (void)reinterpret_cast<int const*>(ip); |
| // Valid: T*** -> T2 const* const* const* |
| (void)reinterpret_cast<int const* const* const*>(ipppc); |
| } |
| |
| void fnptrs() |
| { |
| typedef int (*fnptr2)(int); |
| fnptr fp = 0; |
| (void)reinterpret_cast<fnptr2>(fp); |
| void *vp = reinterpret_cast<void*>(fp); |
| (void)reinterpret_cast<fnptr>(vp); |
| } |
| |
| void refs() |
| { |
| long l = 0; |
| char &c = reinterpret_cast<char&>(l); |
| // Bad: from rvalue |
| (void)reinterpret_cast<int&>(&c); // expected-error {{reinterpret_cast from rvalue to reference type 'int &'}} |
| } |
| |
| void memptrs() |
| { |
| const int structure::*psi = 0; |
| (void)reinterpret_cast<const float structure::*>(psi); |
| (void)reinterpret_cast<int structure::*>(psi); // expected-error {{reinterpret_cast from 'int const struct structure::*' to 'int struct structure::*' casts away constness}} |
| |
| void (structure::*psf)() = 0; |
| (void)reinterpret_cast<int (structure::*)()>(psf); |
| |
| (void)reinterpret_cast<void (structure::*)()>(psi); // expected-error {{reinterpret_cast from 'int const struct structure::*' to 'void (struct structure::*)(void)' is not allowed}} |
| (void)reinterpret_cast<int structure::*>(psf); // expected-error {{reinterpret_cast from 'void (struct structure::*)(void)' to 'int struct structure::*' is not allowed}} |
| |
| // Cannot cast from integers to member pointers, not even the null pointer |
| // literal. |
| (void)reinterpret_cast<void (structure::*)()>(0); // expected-error {{reinterpret_cast from 'int' to 'void (struct structure::*)(void)' is not allowed}} |
| (void)reinterpret_cast<int structure::*>(0); // expected-error {{reinterpret_cast from 'int' to 'int struct structure::*' is not allowed}} |
| } |