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    my %mapping = ( ARRAY  => '@', HASH   => '%', SCALAR => '$',
                    GLOB   => '*', REF    => '$', CODE   => '&' );
    return eval $mapping{$type}.'{$_[0]}';

return @{$_[0]}   if  $type eq "ARRAY";
return %{$_[0]}   if  $type eq "HASH";
return ${$_[0]}   if  $type eq "SCALAR";
return *{$_[0]}   if  $type eq "GLOB";
return ${$_[0]}   if  $type eq "REF";
return &{$_[0]}   if  $type eq "CODE";

my( $ref )= @_;
$ref= $$ref   while  UNIVERSAL::isa($ref,"REF");
...
return $$ref   if  UNIVERSAL::isa($ref,"SCALAR");
return &$ref() if  UNIVERSAL::isa($ref,"CODE");
return $$ref,@$ref,%$ref   if  UNIVERSAL::isa($ref,"GLOB");