Re^2: Almost certainly a module documentation issue


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Re^2: Almost certainly a module documentation issue

by dd-b (Monk)

on Oct 14, 2017 at 20:24 UTC ( [id://1201381]=note: print w/replies, xml )

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in reply to Re: Almost certainly a module documentation issue
in thread Almost certainly a module documentation issue

This worked. This code ran, and the result was acceptable to Email::Sender::Transport::Print->new().

In some ways I'm more confused than ever, though, because when I display the filehandle in perldb the new code shows me

  DB<4> x $sm
0  IO::Handle=GLOB(0x80695a1c8)
   -> *Symbol::GEN0
         FileHandle({*Symbol::GEN0}) => fileno(7)
  DB<5> n
[download]

while isn't IO::Handle anywhere, and duplicates the FileHandle shown in the original code (but wrapped a level down). Still, it's clearly different, and it works, so I won't complain :-).

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Re^3: Almost certainly a module documentation issue
by haukex (Archbishop) on Oct 15, 2017 at 11:04 UTC

while isn't IO::Handle anywhere, and duplicates the FileHandle shown in the original code

It's an object of type IO::Handle, as shown in the first line of the dump. Basically IO::Handle->new boils down to blessing a new symbol as returned by Symbol::gensym (which explains the second line of the dump) into the class IO::Handle (source). If you step through the code, you should see the following:

**Before** the open()
0  IO::Handle=GLOB(0x1948fb2)
   -> *Symbol::GEN0

**After** the open()
0  IO::Handle=GLOB(0x1948fb2)
   -> *Symbol::GEN0
         FileHandle({*Symbol::GEN0}) => fileno(7)
[download]

So the FileHandle appears to be the result of opening the file.

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