Re: Can't get custom allocation function to work

[Ralph Hempel <rhempel@...>]

kathrin_69@gmx.de wrote:
> Hi,
>
> I'm trying to replace the Lua default l_alloc function with my own one. 
> My aim is to have all memory Lua allocates inside a single array of 
> pre-allocated memory.

<snip>

> void* alloc_impl_manual( void* ptr, size_t osize, size_t nsize )
> {
>   if (nsize)
>   {
>       std::vector<unsigned char>* mem = new std::vector<unsigned 
> char>(nsize);
>                //yes, it will leak. don't care for now
>
>       return &(*mem)[0]; //returned memory position should be aligned by 
> new
>   }
>   return NULL;
> }

Ummm, besides the leak, should you not be returning:

  return( mem )

since mem is already a pointer to the memory you allocated?

And this expression  &(*mem)[0] is very strange. I parse that as:

(the adress of ( (the contents of mem) ???? )

my compiler warns that the subscripted value is neither an array nor a
pointer...

Ralph