From: gga <GGarramuno@...>
Date: 2007-01-16T16:38:09+09:00
Subject: Re: How to realize method/function overloading in Ruby?


Shiwei Zhang ha escrito:

> I think Function Overloading in C++ is very meaningful.

It isn't.

> My requirement is: I've had a method "logon(uid,pswd, conn = nil, privilege = nil)", but I want to add > another method like "logon(easyconn)", where easyconn is in the format of
> "uid/pswd@host:port/service_name [AS {SYSOPER|SYSDBA}]"

Ruby is such a complex language compared to C++ :)


class A
  private

  def _logon( uid, pwd, conn, privilege )
    p uid, pwd, conn, privilege
  end

  public

  def logon( uid, pwd = nil, conn = nil, privilege = nil )
    if pwd == nil
      # parse uid as "uid/pswd@host:port/service_name [AS
{SYSOPER|SYSDBA}]"
      # and extract other vars.
      uid =~ /(\S+)\/(\S+)\@(\S+:\S+)(?:\s+AS\s+(SYSOPER|SYSDBA))?/
      uid, pwd, conn, privilege = $1, $2, $3, $4
    end
    _logon(uid, pwd, conn, privilege )
  end

end

# user cannot see private method _logon
p A.instance_methods.grep /logon/

a = A.new
a.logon( 'gga', 'crap', 'host:2322')
a.logon( 'gga/crap@host:2322')
a.logon( 'gga/crap@host:2322 AS SYSOPER')