On Dec 02, 2006, at 07:42:51, Al Viro wrote:
On Sat, Dec 02, 2006 at 04:23:32AM -0500, Kyle Moffett wrote:
On Dec 01, 2006, at 12:21:49, Al Viro wrote:
And that's where it gets interesting. It would be very nice to
get to
the following situation:
* callbacks are void (*)(void *)
* data is void *
* instances can take void * or pointer to object type
* a macro SETUP_TIMER(timer, func, data) sets callback and data
and checks if func(data) would be valid.
This is where a very limited form of C++ templates would do
nicely; you could define something like the following:
template <typename T>
static inline void setup_timer(struct timer_list *timer,
void (*function)(T *), T *data)
{
timer->function = (void (*)(void *))function;
timer->data = (void *)data;
init_timer(timer);
}
Any attempts to call it with mismatched "function" and "data"
arguments would display an "Unable to find matching template"
error from the compiler.
Unfortunately you can't get simple templated functions without
opening the whole barrel of monkeys involved with C++ support;
Fortunately, you can get all checks done by gcc without involving C+
+ (or related flamewars). See original post for a way to do it in
a macro and for fsck sake, leave [email protected] out of it
Oh, I'm sorry I totally missed the CC of [email protected]. My point
was just that while it _could_ be done with GCC and some ugly macros,
a basic form of C++ templates usually produces much nicer and more
descriptive error messages (leaving out all the reasons C++ isn't
usable in the kernel for the sake of academic discussion). The
template syntax is also a bit more descriptive than is the macro
syntax for achieving the same thing.
Cheers,
Kyle Moffett
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