Add a variable to a class instance at runtime: Difference between revisions

=={{header|Pike}}==

Pike does not allow adding variables to existing classes, but we can design a class that allows us to add variables.

<lang Pike>class CSV

{

mapping variables = ([]);

mixed `->(string name)

{

return variables[name];

}

void `->=(string name, mixed value)

{

variables[name] = value;

}

array _indices()

{

return indices(variables);

}

}

object csv = CSV();

csv->greeting = "hello world";

csv->count = 1;

csv->lang = "Pike";

indices(csv);

Result: ({ /* 3 elements */

"lang",

"count",

"greeting"

})

</lang>