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Re: Re: My coding guidelines

by jryan (Vicar)
on Nov 25, 2002 at 19:18 UTC ( #215706=note: print w/ replies, xml ) Need Help??

in reply to Re: My coding guidelines
in thread My coding guidelines

You are missing something, here are two examples:

# prototypes only check arg format # i.e. (scalar/array/hash/code/glob and number of args) package Sample; sub stringify () { return ($_[0]->{data}) x $_[1] } package main; sub print_string($) { print $_[0]->stringify(1) } my $obj = bless ( {data=>"foo\n"}, 'Sample'); print_string($obj); # fine print_string(5); # uh oh... basic numbers don't have a stringify me +thod, # yet the arg passed the prototype since 5 is a sc +alar.
And also:
# methods don't check prototypes... at all. sub print_string_bad($) { print $_[0]->stringify() # Will pass the prototype, yet break since $_ +[1] will be # undef in stringify } print_string_bad($obj);

Hence the reason for the general distaste for prototypes among the perl community. For most cases, they're pointless. They're only there so that you can call your own subs like perl-builtins.

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