On 15 July 2013 13:09, Dan Douglas <[email protected]> wrote:
> Hi, here x.val is assigned after the constructor has already run. It should be
> assigned before so it's accessiable to the "create":
>
> typeset -T X=(
> integer val
>
> function create {
> ((_.val++))
> }
> )
>
> X x=(val=5)
> print -v x.val # should print 6
ksh93 doesn't have a create/creat function for types yet, but you can
use factory functions to manufacture objects on an assembly line.
An example:
###################################
typeset -T X=(
integer val
function factory_create {
((_.val++))
}
)
# this function manufactures objects of type "X"
function factory_X
{
nameref n=$1
X x=(val=5)
x.factory_create
typeset -m n=x
}
# use this to pretty print objects
compound prettyprint
# create an object via our trusty factory
factory_X prettyprint.obj
# print it
print -v prettyprint
###################################
Hint: typeset -m is like /usr/bin/mv, typeset -c is like /usr/bin/cp.
Both are pretty useful to implement object factories or other OOP
methods.
Ced
--
Cedric Blancher <[email protected]>
Institute Pasteur
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