Var::Extract - Assign lexical scalar values from container types


        use Var::Extract qw(vars_from_hash vars_from_getters);
        use Class::Struct qw(struct);
        my $h = {
                foo => "This is foo",
                bar => "This is bar", 
                baz => "This is baz",
        vars_from_hash($h, my ($foo,$bar,$baz));
        print "foo:$foo\nbar:$bar\nbaz:$baz\n";

        # => "foo: This is foo..."
        struct Klass => [attr0 => '$', attr1 => '$'];
        my $klass = Klass->new(attr0 => 42, attr1 => '666');
        vars_from_getters($klass, my ($everything, $evil));
        print "Everything is $everything, evil is $evil\n";
        # => "Everything is 42, evil is 666"


Ever came across something like this? my $foo = $h->{foo}; my $bar = $h->{bar}; my $bas = $h->{baz};

or something worse: my ($foo,$bar,$baz) = @{$h}{qw(foo bar baz)};

One involves a lot of boilerplate, and the other involves being a pain to modify especially with many variables. As a bonus point, you also get to type each variable name twice.


Var::Extract exports two functions on request:

vars_from_hash(\%hash, $some, $variables, $here)

Will assign values of the keys of the hash which correspond to the names of the variables passed. If a key is not found, the variable will remain undefined ( perhaps i should add a switch here to adjust this behavior, but that would mess up the calling convention).

vars_from_getters($optional_prefix, $class, $vars....)

Does the same thing as vars_from_hash, except that instead of using hash keys, it uses Class::-style accessors

An optional $prefix may be provided in the first argument, which is useful in case accessors are named as get_foo, then vars_from_getters("get_", $obj, my $foo) will be assigned the value of $obj-get_foo


Copyright 2011 M. Nunberg for Dynamite Data This module is dual licensed as GPL (v2 or higher) and "The same license as Perl itself"


Hash::Extract, which is similar to vars_from_hash