Re: invalid conversion from void* to int**
Martin J=F8rgensen wrote:
void *alloc_mem (size_t num_elems, size_t elem_size,
char *filename, int line,
size_t *total_mem)
{
void *mem;
size_t size = num_elems*elem_size;
size += (sizeof (size_t) <= elem_size) ? elem_size
: sizeof (size_t);
Why not just use sizeof(size_t) ?
mem = malloc(size);
if (!mem)
{
fprintf(stderr, "%s: line %d, malloc(%lu) failed.\n",
filename, line, (unsigned long) size);
exit(EXIT_FAILURE);
}
/* save memory allocated for this pointer */
memcpy(((char *)mem)+num_elems*elem_size,
&size, sizeof size);
What is the purpose of storing that size there?
How are you planning to access it in future?
*total_mem += size; /* update total memory allocated untill now */
You should check here , and in the mutliplication above,
that you don't overflow a size_t .
return mem;
}
- - - - - - - - - - - - - - - - - - - - - - - -
But I then declared some arrays like:
double **two_D_double;
int **two_D_int;
double *one_D_double;
int *one_D_int;
Those are pointers, not arrays.
etc. etc...
MS visual studio 2005 + gcc doesn't complain. But with g++ I get such an
error as:
"invalid conversion from void* to int**" (the same for double **)
You didn't post any code that would give that error.