You can't throw from the construct block, but you can throw from the
construction method. Thus, the correct way would be:
> class Foo : Object {
> string filename { get; set; }
>
> public Foo.with_file (string filename) throws IOError{
> this.filename = filename;
> if (!any_test_you_need)
> throw new IOError.FILE_NOT_FOUND("Requested file could
> not be found.");
> }
>
> }
2009/6/16 Sam Danielson <[email protected]>:
> What should I do in a construct block when the normal thing would be
> to throw? Can object instantiation be stopped by an error like in C++
> or is the vala way to let construction continue and then set a zombie
> flag?
>
> Maybe a static method that creates an object, checks a zombie flag,
> and then throws if true could masquerade as the actual constructor.
> That's what I would do but it almost seems like a workaround.
>
> Forgive me for having very little experience with both C# and GObject
> and therefore lacking the ability to infer something so simple. Is
> there a preferred way to signal a failed constructor to the caller?
>
> Here is an example of what I'm talking about.
>
>
> errordomain IOError {
> FILE_NOT_FOUND
> }
>
> class Foo : Object {
> string filename { get; set; }
> public bool failed;
>
> private Foo.with_file_ (string filename) {
> this.filename = filename;
> }
>
> public static Foo with_file (string filename) throws IOError {
> var foo = new Foo.with_file_ (filename);
> if (foo.failed) throw new IOError.FILE_NOT_FOUND("Requested
> file
> could not be found.");
> return foo;
> }
>
> construct {
> this.failed = true;
> }
> }
>
> void main () {
> try {
> var foo = Foo.with_file ("test");
> message ("ok");
> }
> catch {
> message ("error");
> }
> }
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>
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