DRAFT document on coding conventions in kde libraries

[Thiago Macieira]

Thiago Macieira wrote:
>that's weird...
>$ cat test.cpp
>#include <dlfcn.h>
>
>typedef void (*functype)(int, int);
>
>main()
>{
>    void *sym = dlsym(0, 0);
>
>    functype f = reinterpret_cast<functype>(sym);
>    f = reinterpret_cast<void (*)(int, int)>(sym);
>
>    (*f)(1,2);
>}
>$ g++ -c -o test.o test.cpp
>[no errors]

Ok, you're not allowed to write the above test, but you're allowed to 
write it this way:

#include <dlfcn.h>

typedef void (*functype)(int, int);

main()
{
    void *sym = dlsym(0, 0);

    functype f;
    *reinterpret_cast<void**>(&f) = sym;

    (*f)(1,2);
}

I tested it on the Itanium machine this time :-)

Itanium solves the problem that a function pointer is really two 64-bit 
numbers by making dlsym return a pointer to the those two numbers.
-- 
  Thiago Macieira  -  thiago (AT) macieira.info - thiago (AT) kde.org
    PGP/GPG: 0x6EF45358; fingerprint:
    E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358

2. Tó cennan his weorc gearu, ymbe se circolwyrde, wearð se cægbord and se 
leohtspeccabord, and þa mýs cómon lator. On þone dæg, he hine reste.
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