[Qt-interest] static function emitting signal

[Colin S. Miller]

Gabriel M. Beddingfield wrote:
> 
> A lot of callback API's will do something like this:
> 
>     typedef void (*SomeCallbackType)(void* arg);
>     int register_callback(SomeCallbackType function, void* arg);
> 
> the 'arg' is a handle to... anything you want.  When wrapping this sort 
> of callback API in C++, it's common to do this:
> 
> class Foo {
> public:
>     Foo() {}
> 
>     static void _callback(void* arg) {
>         Foo* that = static_cast<Foo*>(arg);
>     that->my_callback();
>     }
> 
> protected:
>     void my_callback() {
>         // Do your real work here
>     }
> };
> 
> int main()
> {
>     Foo f;
>     register_callback(Foo::_callback, &f);
> 
>     //...
> }
> 

Shouldn't static_cast be reinterpret_cast   ?

Colin S. Miller

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