DRAFT document on coding conventions in kde libraries

Thiago Macieira thiago at kde.org
Sun Mar 12 17:35:00 GMT 2006

Thiago Macieira wrote:
>that's weird...
>$ cat test.cpp
>#include <dlfcn.h>
>typedef void (*functype)(int, int);
>    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);

    void *sym = dlsym(0, 0);

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


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:
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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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