On Sat, Dec 1, 2012 at 2:24 AM, zocket.sprocket <[email protected]> wrote:
> How do you get a uv watcher to work with an object instance method as
> callback?
>
> Below is what I am trying to do but it is not working for me.
>
> uv_idle_init(uv_default_loop(), &obj->idler_);
> uv_idle_start(&obj->idler_, obj->CheckList);
>
>
> error: argument of type ‘void (Collector::)(uv_idle_t*, int)’ does not match
> ‘void (*)(uv_idle_t*, int)’
You cannot use member functions (methods) directly, not portably
anyway. Use a trampoline instead:
class Foo {
public:
static Foo* New() {
return new Foo();
}
void Dispose() {
uv_close(reinterpret_cast<uv_handle_t*>(&idle_), Dispose);
}
private:
Foo() {
uv_idle_init(uv_default_loop(), &idler_);
idler_.data = this;
uv_idle_start(&idler_, CheckList);
}
static void Dispose(uv_handle_t* handle) {
delete static_cast<Foo*>(handle->data);
}
static void CheckList(uv_idle_t* handle, int status) {
static_cast<Foo*>(handle->data)->CheckList(handle, status);
}
void CheckList(uv_idle_t* handle, int status) {
// ...
}
uv_idle_t idler_;
};
The example also shows how to properly clean up the handle after
you're done with it: that is, you call uv_close() and defer freeing
the memory until the close operation is complete.
Hope that helps.
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