Apologies for my confusedf terminology. I'm meeting with repeated abysmal failure trying to bend generics to my will.
Going back to basics, I started with the example code at https://live.gnome.org/Vala/Tutorial#Generics. I had to rename set_data() and get_data() to get this to compile, but that's no deal. My simple goal is this: having created a wrapper<string>, how do I print it's length inside of set_thing(G data) ?? Or indeed access any properties or methods of the specific 'G' thingy? I can understand run-time errors if I instantiated a wrapper of some non-gobject type, but the compile time error "the name 'get_type' does not exist in the context of 'G'" has me baffled. Here are my various attempts: public class Wrapper<G> : Object { private G data; public void set_thing(G data) { this.data = data; #if broken var x = data.length; /* can't use String methods.... */ #endif #if broken Type t = data.get_type(); /* can't use Object methods either... */ #endif #if broken G x = data; /* No */ Type t = x.get_type(); #endif #if broken var x = (G)data; /* No */ Type t = x.get_type(); #endif #if segfault var x = data as Object; /* Works so far... */ Type t = x.get_type(); stdout.printf("x is %p\n", x); /* seg fault */ #endif #if illegal var x = data as string; /* Operation not supported for type */ Type t = x.length; #endif #if segfault var x = data as Object; int l; x.get("length", out l); /* seg fault */ #endif } public G get_thing() { return this.data; } } /********************************************************************************/ public static int main(string[] args) { var wrapper = new Wrapper<string>(); wrapper.set_thing("test"); return 0; } cheers ant _______________________________________________ vala-list mailing list vala-list@gnome.org http://mail.gnome.org/mailman/listinfo/vala-list
