Actually there is no memory leak in your code. You're redeclaring $hash_ref inside the inner block, and it falls out of scope after the last curly bracket. The fact that a variable by the same name has been declared at a broader scope too is irrelevant. The broader-scoped $hash_ref is never being assigned anything, as it is masked by the inner-scoped $hash_ref.

Now on the other hand, if you made an assignment to $hash_ref without declaring it at the inner scope, after the last curly bracket $hash_ref wouldn't fall out of scope, and the reference count wouldn't drop to zero until the broad-scoped $hash_ref lexical falls out of scope too... in this case at the end of the program.

This isn't a memory leak unless you lose track of $hash_ref without letting it fall out of scope somehow.


Dave

In reply to Re: Memory leaks and reference counting within Perl. by davido
in thread Memory leaks and reference counting within Perl. by DigitalKitty

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.