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

