Re: Use a module only if it is in use

M::hello("again"); # if exists M:hello();

Not exactly sure what you want to achieve... but maybe you just want

    M::hello("again") if defined &M::hello;
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Re^2: Use a module only if it is in use by vitoco (Hermit) on Sep 02, 2009 at 14:57 UTC
The `&` was what I forgot in my tests!!! `M::hello("again") if exists &M::hello;` [download] also works. Thank you!	[reply] [d/l] [select]
Re^3: Use a module only if it is in use by ikegami (Patriarch) on Sep 02, 2009 at 15:13 UTC
`exists` returns true if the sub is declared, whether it's been defined or not. `defined` returns true if the sub is defined. `sub foo; # exists but not defined sub bar {} # exists and defined` [download]	[reply] [d/l] [select]