clear a array to avoid memory leak

Hi

I am new to XS but have coded for perl and C for a few year. Maybe
this question sounds stupid but I can not figure it out on perlgut and
perlxs at the moment.

I have an array which contains several reference of new created
hashes. I know that if I use method newRV_noinc for av_push in
construction stage, the reference to each hash is 1.

After the code does some stuff, I need to clear the array as I want to
refill it. I have made my code in a concise example as following. Now
I wonder whether av_clear will decrement the reference number of hash1
and hash2 to 0. If it does, then hash would be destroyed
automatically, else I have to destroy it explicitly to avoid memory
leak. Could anyone point it out for me?


==========================================================================================
int size1 = 20;
int size2 = 21;
char name1[] = "foo1";
char name2[] = "foo2";

HV *hash1 = newHV();
hv_store(hash1, "name",  strlen("name"),  newSVpv(name1,0),  0);
hv_store(hash1, "size",  strlen("size"),  newSViv(size1),  0);
av_push(array, newRV_noinc((SV*)hash1));  //reference to hash1 is 1

HV *hash2 = newHV();
hv_store(hash2, "name",  strlen("name"),  newSVpv(name2,0),  0);
hv_store(hash2, "size",  strlen("size"),  newSViv(size2),  0);
av_push(array, newRV_noinc((SV*)hash2));  //reference to hash2 is 1

.......
av_clear(array); //whether reference number of hash1 and hash2
decremented here??