NAME

Class::Lego::Constructor - Automated constructor generation

SYNOPSIS

            

              
              
BEGIN {
  require Class::Lego::Constructor;
  @ISA = qw( Class::Lego::Constructor );
}
__PACKAGE__->mk_constructor0({
  magical_number   => 42,
  timestamp => sub { DateTime->new }, # deferred
});
# the weird name, mk_constructor0, is on purpose while API settles
__PACKAGE__->mk_constructor1({
  magical_number => { default => 42 },
  timestamp      => { default => sub { DateTime->new } },
  sort_function  => { default_value => sub { $a <=> $b } }, # really a sub
});
            
          

DESCRIPTION

            

              
              
NOTE: That module was formely called Class::Constructor::Factory.
It will enter the Class-Lego dist soon.
            
          

I like the simplicity of Class::Accessor and friends. With them, creating accessors is a piece of cake. It does give me a default constructor as well.

The case is that this default constructor is not as convenient as the generated accessors. To be precise, I want to specify default values for attributes easily. This module is a tentative solution to this problem.

---

The intent of this module is to augment an existing constructor new which receives a hash ref argument containing pairs of field names versus their values.

            

              
              
$obj = My::Class->new( { f1 => v1, f2 => v2 } );
            
          

When a declared field is omitted from the constructor argument, it can be filled with a default which was declared with mk_constructor0.

            

              
              
default
default_value
            
          

make_simple_constructor