Dear Peter,
Thanks alot for your help.
Ali El-Matarawy
Date: Thu, 5 May 2011 11:59:27 +0200
From: [email protected]
To: [email protected]
CC:
Subject: Re: Parameter prefix
On 05/05/2011 11:25, Ali Matarawy wrote:
Hello,
Sometimes in Mozart manual when they explain a procedure with parameter, they
wrote a prefix with paramet such as ? means this parameter is output, I don't
understand the other parameters prefix such as + , $, *
Best Wishes,
Ali El-Matarawy
The symbols ?, +, * are used in the documentation to indicate input and output
arguments (see
http://www.mozart-oz.org/documentation/base/node2.html#chapter.typestruct).
The symbol $ is different: it's a nesting marker. It's used in programs to use
a statement (which does not return a result) as an expression (which does
return a result). For example, a procedure call {Foo X Y Z} can be used as
follows:
A=B+{Foo X $ Z}
This is strictly equivalent to:
local Y in {Foo X Y Z} A=B+Y end
The call {Foo X $ Z} is an expression that returns the second argument.
Peter
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