Call an overloaded constructor?

Ruby IronRuby
1

Hi

Is there a way for me to call an overloaded constructor?? I want
to say date = new DateTime(2009,9,28) using IronRuby 0.9.2. I have
been
searching quite a bit and haven’t seen anything so far.

Thank you,
Patrick

2

But you can just use the ruby way and that is a lot less noisy

for a local time

Time.local 2009, 9, 28
http://ruby-doc.org/core/classes/Time.html#M000254

for utc
Time.utc 2009, 9, 29
http://ruby-doc.org/core/classes/Time.html#M000252

It still creates a System::DateTime underneath

Met vriendelijke groeten - Best regards - Salutations
Ivan Porto C.
Blog: http://flanders.co.nz
Google Wave: [email protected]
Twitter: http://twitter.com/casualjim
Author of IronRuby in Action (http://manning.com/carrero)

3

System::DateTime.method(:clr_new).overload(Fixnum, Fixnum, Fixnum).call
2009, 9, 28

Met vriendelijke groeten - Best regards - Salutations
Ivan Porto C.
Blog: http://flanders.co.nz
Google Wave: [email protected]
Twitter: http://twitter.com/casualjim
Author of IronRuby in Action (http://manning.com/carrero)

4

CLR DateTime type is currently mapped to Time Ruby class, so “new” uses
only Ruby constructors to be compatible. However, you can use clr_new to
call the CLR constructor for any CLR type with a public constructor:

Time.clr_new(2009, 9, 28)

You can also get the constructor method and call it like so:

Time.clr_ctor.call(2009, 9, 28)

This is useful when there are multiple overloads of the constructor
among which we are not able to choose based upon the types of the actual
arguments.

Tomas

From: [email protected]
[mailto:[email protected]] On Behalf Of Patrick Brown
Sent: Thursday, November 12, 2009 3:49 PM
To: [email protected]
Subject: [Ironruby-core] call an overloaded constructor??

Hi

Is there a way for me to call an overloaded constructor?? I want to
say date = new DateTime(2009,9,28) using IronRuby 0.9.2. I have been
searching quite a bit and haven’t seen anything so far.

Thank you,
Patrick

5

Hi

That is fine in this case, can you tell me, in cases where I can’t
fall
back on a ruby class, is there a way to call an overloaded constructor?
Your reply makes me worry a bit more.

Thanks,
Patrick

6

OOooooh that’s pretty…. J

From: [email protected]
[mailto:[email protected]] On Behalf Of Ivan Porto
Carrero
Sent: Thursday, November 12, 2009 4:07 PM
To: [email protected]
Subject: Re: [Ironruby-core] call an overloaded constructor??

System::DateTime.method(:clr_new).overload(Fixnum, Fixnum, Fixnum).call
2009, 9, 28

Met vriendelijke groeten - Best regards - Salutations
Ivan Porto C.
Blog: http://flanders.co.nz
Google Wave: [email protected]
Twitter: http://twitter.com/casualjim
Author of IronRuby in Action (http://manning.com/carrero)

On Fri, Nov 13, 2009 at 12:49 AM, Patrick Brown
[email protected] wrote:

Hi

Is there a way for me to call an overloaded constructor?? I want to
say date = new DateTime(2009,9,28) using IronRuby 0.9.2. I have been
searching quite a bit and haven’t seen anything so far.

Thank you,

Patrick

Ironruby-core mailing list
[email protected]
http://rubyforge.org/mailman/listinfo/ironruby-core

7

Hi Patrick,

Assuming you have the next C# class in C:\CustomAssembly.dll:
namespace ClassLibrary2
{
public class Class1
{
public Class1(int a)
{
Console.WriteLine(a);
}
public Class1(int a, string s)
{
Console.WriteLine(“{0} and {1}”,a,s);
}
public Class1(bool b)
{
Console.WriteLine(“b = {0}”,b);
}
}
}

There are several constructors here. All you have to do to call a
specific
constructor via IronRuby, is to get the constructor method object (with
clr_ctor like Tomas said), use the overload method to pick up the needed
overload and call it.
For example, the next IronRuby code executes all three constructors of
the
custom class above:
require ‘c:\CustomAssembly.dll’

include ClassLibrary2

Call Class1(int a) constructor:

Class1.clr_ctor.overload(System::Int32).call 1

Prints “1”

Call Class1(int a, string s) constructor

Class1.clr_ctor.overload(System::Int32, System::String).call 1, “yes”

Prints “1 and yes”

Call Class1(bool b) constructor:

Class1.clr_ctor.overload(System::Boolean).call true

Prints “b = true”

Hope it helps,
Shay.

–

Shay F.
Author of IronRuby Unleashed
http://www.IronShay.com
Follow me: http://twitter.com/ironshay

8

Hello

Thank you all for your help and I have to say that I am sorry also, I
missed the other replies where you came right out and told me how to do
it,
for some reason I only saw the one that mapped the DateTime to the Time
object, you all provided very good answers to my question and I really
appreciate it.

Patrick