use a_module;

my $global = a_module->new();

sub func1 {
     $global->do_something1();
}

sub func2 {
     $global->do_something2();
}

$global->do_init;
func1();
func2();

##</code><code>##

use a_module;

sub func1 {
     my $var = $_[0];
     $var->do_something1();
}

sub func2 {
     my $var = $_[0];
     $var->do_something2();
}

my $local = a_module->new();
$local->do_init;
func1($local);
func2($local);

##</code><code>##

use a_module;

sub func1 {
     my $var = $_[0];
     $var->do_something1();
}

sub func2 {
     my $var = $_[0];
     $var->do_something2();
}

my $local = a_module->new();
$local->do_init;
func1(\$local);
func2(\$local);