Re^2: "used only once" warning from Class::Std

Thanks for that. It looks like good guidance for future changes/implementations. None the less, I would like to understand why perl is behaving the way that it is.

BTW, it occurs to me that a reference to sub DESTROY is being added to the namespace of the package that uses Class::Std. Thus, in my test case, the sub isn't being invoked as Class::Std::DESTROY, but rather as MyClass::DESTROY. But it's the same code and I don't see how that would make any difference to whether the warning is issued or not.

Comment on Re^2: "used only once" warning from Class::Std

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Re^3: "used only once" warning from Class::Std by Anonymous Monk on Apr 25, 2010 at 03:21 UTC
Because Class::Std starts with `package Class::Std; our $VERSION = '0.011'; use strict; use warnings; use Carp; use Scalar::Util; use overload;` [download] and your module doesn't! Use strict warnings and diagnostics or die	[reply] [d/l]
Re^4: "used only once" warning from Class::Std by ig (Vicar) on Apr 25, 2010 at 04:52 UTC
I wish it were so simple, but I don't think so. In fact, my main program and module both had `use strict;` and `use warnings;` originally, as I use them habitually. So much so that initially I had thought the warnings were produced because of them and reported a bug on Config::Std that it was incompatible with `use warnings;`. It was only later that I realized the warning didn't go away when I removed `use strict;` and `use warnings;` from my own code. None the less, to test your assertion, I changed the main program to: `#!/usr/bin/perl use strict; use warnings; use MyClass; my $obj = MyClass->new();` [download] but still the warning was produced. Then I changed the module to: `package MyClass; use strict; use warnings; use Class::Std; my $hash_ref = {}; bless $hash_ref, 'MyClass'; sub DEMOLISHx { print "demolishing...\n"; } 1;` [download] And still the warning was produced. So, after all, the warning wasn't produced because Class::Std uses strict and warnings and my module doesn't. Other ideas?	[reply] [d/l] [select]