Re: [Simulavr-devel] [PATCH] use static callbacks instead of template param for IOReg

[panic]

Hi,

Michael Hennebry:
> The PINx toggle of PORTx bits is not a new feature.
> simulavr must support this.
> A RMW implementation of SBI also does not work on registers with interrupt 
> flags.

At least according to avrlibc doc, this is not recommended for interrupt
flags:

http://www.nongnu.org/avr-libc/user-manual/FAQ.html#faq_intbits
http://www.atmel.com/webdoc/avrlibcreferencemanual/FAQ_1faq_intbits.html

> That does not imply the goodness of a major data structure organization.
> I note that an SBI instruction can only address registers on which it works.
> Allowing extra functionality in other registers should not cause problems.
> 
> Note that on some old AVRs, SBI *is* RMW and their datasheets reflect this.
> 
> The confusing cyclic reference is called the curiously recurring template 
> pattern.
> Not evil.
> Pointers to void are not preferable.
> As a rule, in C++, pointers to void are a bad idea.

what about pointers to Hardware instead? This is the least common
denomininator.
This should also avoid the template altogether, shouldn't it?

> I'm not clear on the template parameter type issue.
> template <typename T> class {  ... public: typedef T parametertype; ... } ;

Cheers,
panic