subroutine exists

[George Mpouras]

How can I find if a subroutine exists without try to call it ?

 

[George Mpouras]

I think I found it


my $var = 'f2';
print ref *{__PACKAGE__.::.$var}{CODE} ;

 

[George Mpouras]

I have to check if an external package have a method or not (windows ,
linux)

 

[Rainer Weikusat]

I have to check if an external package have a method or not (windows
, linux)

That a symbol table entry pointing at a code reference exists at the
moment doesn't necessarily mean it will still exist by the time it is
supposed to be used and vice-versa. In particular, this check won't
find anything an AUTOLOAD sub will either create or emulate.

 

[George Mpouras]

correct. It is a little bit more complicated. I know that my methods exists,
but they should not try to call something that do not exist, autoload
automation does not help a alot

Ο "Rainer Weikusat" έγÏαψε στο μήνυμα

I have to check if an external package have a method or not (windows
, linux)

That a symbol table entry pointing at a code reference exists at the
moment doesn't necessarily mean it will still exist by the time it is
supposed to be used and vice-versa. In particular, this check won't
find anything an AUTOLOAD sub will either create or emulate.

 

[George Mpouras]

Some:ackage->can("some_method") is good. The side effect is that executes
the method (if exists) when you might only want to check

 

[Wolf Behrenhoff]

Am 28.03.2012 10:19, schrieb George Mpouras:

Some:ackage->can("some_method") is good. The side effect is that executes
the method (if exists) when you might only want to check

I don't observe such a side effect. It doesn't execute the function.

from perltoot:
The can() method, called against that object or class, reports back
whether its string argument is a callable method name in that class. In
fact, it gives you back a function reference to that method:

- Wolf