"perl's way" is better(?), faster, cheaper, shorter(just), and preferable in every way(opinion?).

c:\test>perl -MBenchmark=cmpthese
my ($a,$b)=('a'x1000,'b'x1000);
cmpthese( -10, {
PERL=> sub{ ($a, $b) = ($b, $a); },
C   => sub{ my $t=$a, $a=$b, $b=$t; },
XOR => sub{ $a^=$b^=$a^=$b; },
} );
^Z
Benchmark: running C, PERL, XOR, each for at least 10 CPU seconds...
         C: 10 wallclock secs (10.01 usr +  0.00 sys = 10.01 CPU) @ 19
+7752.07/s (n=1980487)
      PERL: 10 wallclock secs (10.30 usr +  0.00 sys = 10.30 CPU) @ 12
+1439.73/s (n=1250222)
       XOR: 10 wallclock secs (10.03 usr + -0.01 sys = 10.02 CPU) @ 33
+5113.02/s (n=3356492)
         Rate PERL    C  XOR
PERL 121440/s   -- -39% -64%
C    197752/s  63%   -- -41%
XOR  335113/s 176%  69%   --

c:\test>

[download]

If performance isn't a concern I use list assignment, if it is, I'd use the XOR method.

Examine what is said, not who speaks.

In reply to Re: Re: swapping vars, two ways, 2 results... by BrowserUk
in thread swapping vars, two ways, 2 results... by Sihal

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