Re: [Vala] functions and null

[Anatol Pomozov <anatol pomozov gmail com>]

2011/1/19 Pavol Klačanský <pavol klacansky com>:
> Hi, why this code doesn't work
Here the item is null
> Item item = null;
>
> parse_content(item);
And in this function you declared parameter as non-null
> parse_content(Item item) {
>        stderr.printf("argh");
> }
>
> reports
> ** (process:674): CRITICAL **: xml_parser_parse_content: assertion
> `item != NULL' failed

Unlike Java and other languages Vala has idea of nullable references.

You should declare your function as

parse_content(Item? item) {

pay attention to the question mark after the parameter type.