In some project, I have seen this code:

static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) { (void)ud; (void)osize; /* some code not using `ud` or `osize` */ return ptr; } 

Do the two casts to void serve any purpose?

In some C project, I have seen this code:

static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) { (void)ud; (void)osize; /* some code not using `ud` or `osize` */ return ptr; } 

Do the two casts to void serve any purpose?

Possible Duplicates:
casting unused return values to void
C++ What is the purpose of casting to void?

In some project, I have seen this code:

static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) { (void)ud; (void)osize; /* some code not using `ud` or `osize` */ return ptr; } 

Do the two casts to void serve any purpose?

In some project, I have seen this code:

static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) { (void)ud; (void)osize; /* some code not using `ud` or `osize` */ return ptr; } 

Do the two casts to void serve any purpose?