Programmer Guide/General Descriptions/Instance Environment: Difference between revisions
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Instance variables are preceded by the ampersand character <code>&</code>. | Instance variables are preceded by the ampersand character <code>&</code>. | ||
No special variables are defined for the instance environment. A programmer should take care about variables used in base classes and about the fact that instance variables can also be accessed and changed from outside the class/instance e.g. by using <code>instancename.variablename</code> in a <code>READ</code> command or an assignment statement. | No special variables are defined for the instance environment. | ||
You can retrieve the value of an instance variable using the syntax: | |||
instance[!variable,varname] | |||
For example: | |||
$#obj[!variable,xmin] | |||
Will return the value of the <code>&xmin</code> variable in the <code>$#obj</code> instance. | |||
A programmer should take care about variables used in base classes and about the fact that instance variables can also be accessed and changed from outside the class/instance e.g. by using <code>instancename.variablename</code> in a <code>READ</code> command or an assignment statement. | |||
Latest revision as of 15:15, 14 December 2017
Instance variables are preceded by the ampersand character &.
No special variables are defined for the instance environment.
You can retrieve the value of an instance variable using the syntax:
instance[!variable,varname]
For example:
$#obj[!variable,xmin]
Will return the value of the &xmin variable in the $#obj instance.
A programmer should take care about variables used in base classes and about the fact that instance variables can also be accessed and changed from outside the class/instance e.g. by using instancename.variablename in a READ command or an assignment statement.
