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There are many more variants on these available in the Perl API. The newSVpvf macro is particularly handy to know about, however, because it makes constructing strings easy using C s sprintf function. The regular newSVpv requires a length argument, but the macro will automatically calculate the string length if we supply a zero as we did here. As we saw earlier, we can use SvTRUE to test a scalar for truth in the Perl sense of that word. We can also call macros like SvCUR to retrieve the length of the string. What about references From the perspective of C, a reference is simply a scalar value whose value is another SV. The outer SV is a wrapper for the SV inside. We can dereference it to get the inner scalar with SvRV (which returns NULL if the scalar isn t a reference) and create a reference to a scalar with newSVrv or newRV_inc. The abbreviation for references is therefore RV, but there is no RV data type in C. Instead, references are SVs, just like regular scalars, and test an SV to see if it is an RV or not with macros like SVROK. We will return to them later in this chapter.

Unless the system we design is fairly simplistic, complexities are going to arise. Certain components will need to know some bit of data, such as the name of a data source or the current tax rate for a purchase, to run properly. Sometimes we need more than just simple data, and our components depend on each other to run. For example, we may abstract the cfmail tag into a MailService component in order to maintain one point of reference to our mail server. Now we can just use the MailService whenever we want to send an e-mail in our application. We ve gained an important ability to move mail servers by simply changing one component, but we ve also created a new dependency. Any component that uses the MailService

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Handling Perl arrays is done with get_av and a range of functions like av_fetch, av_pop, av_push, av_unshift, and av_delete, among others We can also create arrays in C using newAV and populate it with av_store or av_make Following is an example of how we can use some of these functions.

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Since the interpreter startup and shutdown code remains the same, we will just swap out the do_stuff subroutine with a new one: void do_stuff (void) { AV *thetime,*anotherary; /*AV is C type for arrays*/ SV *isdst_sv; /*array elements are SVs*/ I32 thehour,theminute; /*explicitly 32-bit int'*/ /* create an array */ eval_pv("@time=localtime",TRUE); thetime = get_av("time",FALSE); /* the array */ theminute = SvIV(* av_fetch(thetime, 1, FALSE)); thehour = SvIV(* av_fetch(thetime, 2, FALSE)); printf("It is %d:%d \n",thehour,theminute); printf("@time has %d elements\n",av_len(thetime)+1); isdst_sv=av_pop(thetime); /* pop a value */ printf("@time has %d elements\n",av_len(thetime)+1); } Notice that most of the code in this subroutine works with arrays directly from C only the first statement actually runs any Perl code It also does not mention the interpreter instance by name, because the macros reference my_perl implicitly this is why we created it as a global variable in the first place.

The av_fetch function does the job of accessing array elements by index We can also pop and unshift them and, of course, push and shift new SV* values too If the last argument to av_fetch is a TRUE rather than FALSE as here, then it also serves to create the array element if the array does not yet hold it (just as it would in Perl) We can also use av_store to set an SV* into the array The return value is of type SV**, a pointer to the SV pointer passed as the last argument, or NULL if the store failed for any reason For example, to replace the SV at index 2 of the array, we would write if (av_store(thetime,2,new_hour_sv)==NULL) { /* failed! */ }.

now depends on it and requires it to operate This is not really bad, except that we will need to decide what to do about the settings that the MailService needs to operate The MailService itself depends on things like the mail server address and perhaps a default from address This isn t really a big issue when we are talking about only a few collaborating objects, but what if we are talking about 10, 20, or a 100 Our system is going to grow somewhere, and so is the complexity of creating all the components and supplying them with the data they need to get their jobs done This is the essence of the problem that ColdSpring aims to solve ColdSpring (http://wwwcoldspringframeworkorg/) was designed mainly to abstract away everything to do with creating your application s model components.

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