Re: Contextual::Return and Want, any major difference?

[duelafn]

Want dispatches based on immediate context, whereas Contextual::Return dispatches based on first use. Example:

#!/usr/bin/perl
use warnings;
use strict;
use Contextual::Return;
use Want;

sub foo_want {
    if (want('HASH')) { return { foo => "bar" } }
    else              { return "Hello" }
}

sub foo_ctx {
    return
        HASHREF { { foo => "bar" } }
        DEFAULT { "Hello" }
}

print foo_ctx()->{foo}, "\n";
print foo_want()->{foo}, "\n";


my $ctx  = foo_ctx();
my $want = foo_want();

print $ctx->{foo}, "\n";
print $want->{foo}, "\n";

And the result

$ perl /tmp/test.pl
bar
bar
bar
Can't use string ("Hello") as a HASH ref while "strict refs" in use at
+ /tmp/test.pl line 22.

In the second case, Want "fails" because it was not called in hashref context.

Note: rreturn only needed in :lvalue subs

Update: Showed that the want code works when used inline.