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Working with hashes and references is very similar to arrays and scalars, so now that we know the basics of handling scalar and array values, we can easily extend them to these data types too. We can store and fetch hash keys with hv_get and hv_store, test them with hv_exists, delete them with hv_delete, and create a new hash in C with newHV. We also have a collection of hv_iter* routines to manage the iterator with. The following subroutine manipulates the %ENV hash, first by adding and then removing a new key, then by printing out the contents using the iterator: void do_stuff(void) { HV *env = get_hv("ENV",TRUE); /* get %ENV hash */ SV value, *valuep; /* key value */ I32 length; /* key length */ char *key; /* key name */

/* store, retrieve, and delete a new key*/ hv_store(env, "newkey", 6, newSVpv("newvalue",8), TRUE); if (hv_exists(env, "newkey", 6)) { valuep = hv_fetch(env, "newkey", 6, TRUE); printf("newkey => %s\n---\n", SvPV(*valuep, PL_na)); hv_delete(env, "newkey", 6, G_DISCARD); } /* iterate over keys and print them out*/ hv_iterinit(env); while ((value = hv_iternextsv(env, &key, &length))) { printf("%-20s => %s\n", key, SvPV(value, PL_na)); } } The hv_iternextsv function is actually a convenient combination of several other steps, hv_iternext, hv_iterkey, and hv_iterval. There are many, many other functions and macros that we can use to manipulate and test Perl data from C, but this provides a taste of what is possible. The G_DISCARD flag tells Perl to throw away the value and return NULL; otherwise, we get a pointer to the SV value of the key we deleted (if it was present in the hash).

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It is relatively simple to create complex data structures, though we may have to keep an eye on our reference counts as we mentioned when we talked about arrays. Since an array or hash held as a value of another array or hash is really stored through a reference, nesting arrays and hashes is simply a case of wrapping an AV* or HV* value with a scalar RV. To do that, we use newRV_inc or newRV_noinc and recast the pointer to an SV*, as illustrated in this version of do_stuff, which stores an array in an element of a second array and in the value of a hash key: void do_stuff(void) { SV *scalar,*reference; AV *array,*array2; HV *hash; SV **valuep; /* create an array of 10 elements */ array = newAV(); for (int i=0; i<10; i++) { scalar = newSVpvf("value %d",i+1); av_push(array, scalar); } /* create reference for array ref count is already 1 from creation so we do not increment it again */ reference = newRV_noinc((SV *)array); /* add reference to a new array */ if (array2 = newAV()) { av_push(array2, reference); } /* add reference to hash. As the array also holds the reference we increment the ref count if successful */ if (hash = newHV()) {

These topics could fill up their own articles, but in this one, we re going to cover ColdSpring s core focus: managing components..

SvREFCNT_inc(reference); if (hv_store(hash, "array", 6, reference, 0)==NULL) { SvREFCNT_dec(reference); } } /* extract array from hash */ if (valuep = hv_fetch(hash, "array", 6, FALSE)) { SV *svref = *valuep; if (SvOK(svref) && SvROK(svref)) { SV *sv = SvRV(svref); if (SvTYPE(sv) == SVt_PVAV) { AV *av = (AV *) sv; /*recast*/ SV **svp; if (svp = av_fetch(av, 2, FALSE)) { printf("Got '%s' from index 2 of array\n",SvPV(*svp,PL_na)); } } } } } This example manages the reference counts, allowing for the fact that newly constructed data types have a default reference count of 1 to start with, and takes care not to increment them unnecessarily. When we add the array reference to the hash as well as the second array, we do need to increment the count, however. It also extracts the array reference from the hash, dereferences it, and prints out the string value of one of the scalars stored in it. We happen to know how we created the data structure, but since we should usually check what we are doing we use SvOK and SvROK to verify that the scalar is valid and is indeed a reference. The SvTYPE macro tells us what kind of thing the reference was pointing to. We compare it to SVt_PVAV to check for an array to check for a hash we would instead use Svt_PVHV. Once we know we have an array, we can recast back to an AV* and access it as normal.

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