Difference between 5.12.2 and 5.14.1 if you set PERLIO_DEBUG= 

$ perl  -le " open my $fh => '<:raw', \'blah' "

[download]
-e:1 scalar => 0x12113000
-e:1 raw => 0x68b5c6c0
-e:1 Layer 1 is raw
-e:1 openn(raw,':raw','r',-1,0,0,0,1,0x3f5230)
-e:1 Layer 0 is unix
-e:0 Destruct 0x3f3f7c
...

[download]
 
-e:1 scalar => 64fc3000
-e:1 raw => 66c53840
-e:1 Layer 1 is raw
-e:1 openn(raw,':raw','r',-1,0,0,00000000,1,003f5230)
-e:1 Layer 0 is unix
-e:1 Layer 0 is scalar
-e:1 PerlIO_push f=009941dc scalar r 0099a904
-e:1 PerlIO_push f=009941dc raw r 003f47a8
-e:1 :raw f=009941dc :scalar
-e:0 PerlIO_pop f=009941dc scalar
-e:0 Destruct 003f4004
...

[download]

On the other hand, if you use 

$ perl  -le " open my $fh => '<:encoding(UTF-8)', \'blah' "

[download]
there is no difference aside from the usual memaddr 
-e:1 encoding => 0x1076000
-e:1 Layer 1 is encoding
-e:1 openn(encoding,':encoding(UTF-8)','r',-1,0,0,0,1,0x3f5208)
-e:1 Layer 0 is unix
-e:1 Layer 0 is scalar
-e:1 PerlIO_push f=0x9b4024 scalar r 0x9ba20c
-e:1 PerlIO_push f=0x9b4024 encoding r 0x9b9c4c
-e:0 PerlIO_pop f=0x9b4024 encoding
-e:0 PerlIO_pop f=0x9b4024 scalar
-e:0 Destruct 0x3f3f5c

[download]

In reply to Re: Perl 5.12: layers and opening scalars as file handles by Anonymous Monk
in thread Perl 5.12: layers and opening scalars as file handles by afoken

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.