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perlfunc:ref

by gods
on Aug 24, 1999 at 22:42 UTC ( #246=perlfunc: print w/replies, xml ) Need Help??

ref

See the current Perl documentation for ref.

Here is our local, out-dated (pre-5.6) version:


ref - find out the type of thing being referenced



ref EXPR

ref



Returns a TRUE value if EXPR is a reference, FALSE otherwise. If EXPR is not specified, $_ will be used. The value returned depends on the type of thing the reference is a reference to. Builtin types include:

    REF
    SCALAR
    ARRAY
    HASH
    CODE
    GLOB

If the referenced object has been blessed into a package, then that package name is returned instead. You can think of ref() as a typeof() operator.

    if (ref($r) eq "HASH") {
        print "r is a reference to a hash.\n";
    }
    if (!ref($r)) {
        print "r is not a reference at all.\n";
    }

See also the perlref manpage.


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erix .oO( that sounds Boyer-Mooreish )
[Corion]: erix: Yes, but that's mostly for skipping characters you'll never read, but this approach skips the problem of needing to load more data while looking at a half-match
[Corion]: I mostly wonder how I can add this "reversal" to my toolchest, and if it's worth it or just clever
[choroba]: It should greatly simplify the parsing code, no flags or additional reading of the next buffer needed

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