OT: Nice

ruby-talk
1

http://nice.sourceforge.net

Very neat language I discovered recently - similar in feel and spirit if
not in every specific to Ruby, and a solution to making Java programming
fun and productive that doesn’t involve embedding an interpreter.

martin

2

Interesting. I think this is the right approach to take when creating a
language (make it easy to integrate with code from an already popular
language). This is exactly how C++ got its start, and I suspect is the
only way to create a successor to either C++ or Java.

One question: what is the purpose of the ‘@’ character in an argument
list, e.g.:

display(p@Person)
{
return p.name + " (age=" + p.age + “)”;
}

And how does it differ from the C-style argument lists:

void main(String args)
{
System.out.println(“Hello, world!”);
}

Paul

···

On Fri, Aug 01, 2003 at 09:50:54PM +0900, Martin DeMello wrote:

http://nice.sourceforge.net

Very neat language I discovered recently - similar in feel and spirit if
not in every specific to Ruby, and a solution to making Java programming
fun and productive that doesn’t involve embedding an interpreter.

3

One question: what is the purpose of the ‘@’ character in an argument
list, e.g.:

display(p@Person)
{
return p.name + " (age=" + p.age + “)”;
}

I think it just “declares” p as an instance of Person. So it’s not
really different from the C version.

···

On Fri, Aug 01, 2003 at 10:18:24PM +0900, Paul Brannan wrote:

And how does it differ from the C-style argument lists:

void main(String args)
{
System.out.println(“Hello, world!”);
}

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Math PhD. UMD | http://www.math.umd.edu/~dcarrera/pgp.html

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4

One question: what is the purpose of the '@' character in an argument
list, e.g.:

to specialize the argument (it implement multi-dispatch)

And how does it differ from the C-style argument lists:

apparently functions have a single implementation (no specialization).

Guy Decoux

5

display(p) → default implementation
display(p@Person) → p is a Person or one of its subclasses
display(p#Person) → p is a Person exactly

http://nice.sourceforge.net/manual.html#id2800987

martin

···

Paul Brannan pbrannan@atdesk.com wrote:

One question: what is the purpose of the ‘@’ character in an argument
list, e.g.:

display(p@Person)
{
return p.name + " (age=" + p.age + “)”;
}

6

Well, a ‘default’ implementation that the multimethod dispatcher falls
through to if none of the specialised rules match.

martin

···

ts decoux@moulon.inra.fr wrote:

One question: what is the purpose of the ‘@’ character in an argument
list, e.g.:

to specialize the argument (it implement multi-dispatch)

And how does it differ from the C-style argument lists:

apparently functions have a single implementation (no specialization).

7

Well, a 'default' implementation that the multimethod dispatcher falls
through to if none of the specialised rules match.

Apparently he make a difference between function and methods

  http://sourceforge.net/mailarchive/forum.php?thread_id=1640098&forum_id=4922

Guy Decoux

8

Oops, sorry - I misunderstood your last post.

martin

···

ts decoux@moulon.inra.fr wrote:

Well, a ‘default’ implementation that the multimethod dispatcher falls
through to if none of the specialised rules match.

Apparently he make a difference between function and methods

http://sourceforge.net/mailarchive/forum.php?thread_id=1640098&forum_id=4922