Re: Question of casts, lvalues, and & operator

On Thursday 10 April 2003 08:57, Marc Singer wrote: > int func_b (void** ppv) > { > *ppv = (void*) 2; > return 0; > } > > > char* test (void) > { > char* pa = NULL; > func_b (&(void*)pa); creates a pointer-to-void, copies the value of pa into it and then takes the address of that new obje

Re: Question of casts, lvalues, and & operator

On Wed, Apr 09, 2003 at 11:57:37PM -0700, Marc Singer wrote: > func_b (&(void*)pa); > So, is this simply an example of the compiler failing to warn? Yes. When you cast something, the compiler can do many things: covert the value and put it in a register (in which case you can't take the address

Question of casts, lvalues, and & operator

I've found that G++ 3.2 has a problem optimizing this code. #include int func_b (void** ppv) { *ppv = (void*) 2; return 0; } char* test (void) { char* pa = NULL; func_b (&(void*)pa); return pa; } int main (int, char**) { char* p = NULL; p = test (); printf ("%p\n", p); ret