You're the benchmark master. ;-) One-time hit to require overload and then a single function call, or always check blessed, store the original package and bless twice?

Or how about this -- so we only use it if something else has loaded overload and the object is actually overloaded?

sub refaddr_pp {
    return if not ref $_[0];
    if (    exists $INC{'overload.pm'}  
         && overload::Overloaded($_[0]) ) {
        overload::StrVal($_[0]) =~ /0x(\w+)/;
        return hex $1;
    }
    else {
        return 0 + $_[0];
    }
}
[download]

You're the benchmark master. ;-) One-time hit to require overload and then a single function call, or always check blessed, store the original package and bless twice?

No idea :-) I was thinking of memory footprint rather than speed myself... but you're right. Capital mistake to theorise ahead of data and all that.

I'm trying to remember to benchmark more myself. Some quick benchmarking I did suggests they're all within the margin of error. Rest deleted

Update: Error is in front of keyboard. There's a big difference if I actually write my benchmark code correctly.

(Each loop did a refaddr on one object, one hash ref, and one ref to a constant.)

# overload used on object
               Rate bless_regex   strval_0+    bless_0+
bless_regex 12921/s          --        -34%        -37%
strval_0+   19557/s         51%          --         -5%
bless_0+    20495/s         59%          5%          --

# no overloading ( and overload not loaded )
                Rate bless_regex    bless_0+   strval_0+
bless_regex  13504/s          --        -35%        -93%
bless_0+     20766/s         54%          --        -90%
strval_0+   206767/s       1431%        896%          --

# bless_regex: fixed PP version from Scalar::Util to store package usi
+ng PP blessed, and only rebless if reference is blessed

# bless_0+: same as above, but use 0+$ref instead of regex extraction

# strval_0+: if overload loaded and reference is overloaded, use StrVa
+l to extract with regex, otherwise, use 0+$ref
[download]

-xdg

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