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// RUN: %clang_cc1 -fsyntax-only -verify %s
#include <stdint.h>
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);
intptr_t i = reinterpret_cast<intptr_t>(vp);
(void)reinterpret_cast<float*>(i);
fnptr fnp = reinterpret_cast<fnptr>(i);
(void)reinterpret_cast<char>(fnp); // expected-error {{cast from pointer to smaller type 'char' loses information}}
(void)reinterpret_cast<intptr_t>(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::*)()' is not allowed}}
(void)reinterpret_cast<int structure::*>(psf); // expected-error {{reinterpret_cast from 'void (struct structure::*)()' 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::*)()' is not allowed}}
(void)reinterpret_cast<int structure::*>(0); // expected-error {{reinterpret_cast from 'int' to 'int struct structure::*' is not allowed}}
}
// PR5545
class A;
class B;
void (A::*a)();
void (B::*b)() = reinterpret_cast<void (B::*)()>(a);
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