cast to pointer from integer of different size, pthread code

Question

I have this code for matrix multiplication, using pthreads, but I get the error \"cast to pointer from integer of different size\"

I don\'t know what is wrong.I am n

Answer 1

You want to cast integer, short, or char and set a pointer to that value use the reinterpret_cast() call. We used to just (void*) the value and the older compilers were happy, but the new versions, for example g++ 4.8.5, know the value is not the right size for a pointer. reinterpret_cast is just like a cast but it resized it so the compile doesn't complain.

For example:

int i = 3;
pointer void * ptr;

ptr = (void*)i;                    // will generate the warning
ptr = reinterpret_cast(i);  // No warning is generated

X11 example getting a character out of addr and then setting XTPOINTER to it.

val = (XTPOINTER)(*(char*)toVal.addr);                   //  warning
val = reinterpret_cast(*(short*)toVal.addr);  // No warning