Re: Cryptic C function pointer for conversion
On Saturday, 17 December 2016 at 15:15:26 UTC, data pulverizer wrote: Does this mean that you can translate C code to D natively? I am currently only aware of the dstep package. It may not help you, but something I've done in the past is use Swig to create a Common Lisp interface. It translates the C to Common Lisp. That is generally much easier for me to understand.
Re: Cryptic C function pointer for conversion
p.s.: that means that i didn't really *decoded* that declaration, just brute-forced someting that c++ compiler happily accepts. so take it with a grain of salt. ;-)
Re: Cryptic C function pointer for conversion
On Saturday, 17 December 2016 at 14:06:07 UTC, ketmar wrote:
On Saturday, 17 December 2016 at 13:39:27 UTC, data pulverizer
wrote:
that is what it means, in D:
//void (*(*xDlSym)(sqlite3_vfs*,void*, const char
*zSymbol))(void);
struct sqlite3_vfs {}
extern(C) {
alias RetRes = void function ();
alias DeclType = RetRes function (sqlite3_vfs *a,void *b, const
char *zSymbol);
DeclType xDlSym;
void zoo (void) {}
auto goo (sqlite3_vfs *a,void *b, const char *zSymbol) { return
}
}
void main () {
xDlSym =
}
at least that is what i managed to decode, fed to C(++)
compiler and translate to D.
p.s. I confirmed your interpretation on stackoverflow:
http://stackoverflow.com/questions/8722817/syntax-for-a-pointer-to-a-function-returning-a-function-pointer-in-c
Re: Cryptic C function pointer for conversion
On Saturday, 17 December 2016 at 15:15:26 UTC, data pulverizer
wrote:
Does this mean that you can translate C code to D natively? I
am currently only aware of the dstep package.
with my head and bare hands. well, armed with some regular
expressions. did you seen some of my "port" announcements? they
all done manually. it's not that hard, mostly search-and-replace.
also, i did used c++ 'cause it has `auto` feature, so i pasted
your declaration, and then played with c++ and -Wall until it
silenced. actually,
void zoo (void) {}
auto goo (sqlite3_vfs *a,void *b, const char *zSymbol) { return
}
was taken verbatim from c++. as you can see, it even has
`(void)`, which is forbidden in D (but allowed in my dmd fork ;-).
Re: Cryptic C function pointer for conversion
On Saturday, 17 December 2016 at 14:06:07 UTC, ketmar wrote:
that is what it means, in D:
//void (*(*xDlSym)(sqlite3_vfs*,void*, const char
*zSymbol))(void);
struct sqlite3_vfs {}
extern(C) {
alias RetRes = void function ();
alias DeclType = RetRes function (sqlite3_vfs *a,void *b, const
char *zSymbol);
...
}
Thanks ketmar,
I guess that this means I got it the other way round the function
pointer that is returned is the function that takes in and
returns void.
at least that is what i managed to decode, fed to C(++)
compiler and translate to D.
Does this mean that you can translate C code to D natively? I am
currently only aware of the dstep package.
Re: Cryptic C function pointer for conversion
On Saturday, 17 December 2016 at 13:39:27 UTC, data pulverizer
wrote:
that is what it means, in D:
//void (*(*xDlSym)(sqlite3_vfs*,void*, const char
*zSymbol))(void);
struct sqlite3_vfs {}
extern(C) {
alias RetRes = void function ();
alias DeclType = RetRes function (sqlite3_vfs *a,void *b, const
char *zSymbol);
DeclType xDlSym;
void zoo (void) {}
auto goo (sqlite3_vfs *a,void *b, const char *zSymbol) { return
}
}
void main () {
xDlSym =
}
at least that is what i managed to decode, fed to C(++) compiler
and translate to D.
Cryptic C function pointer for conversion
I have come across a function pointer in C that I am attempting to convert, and am not sure what the current interpretation is: ``` \\ The C Code: void (*(*xDlSym)(sqlite3_vfs*,void*, const char *zSymbol))(void); ``` The best I can tell is that this is a function pointer that returns a function that returns void and the correct translation to D is: ``` alias void function(sqlite3_vfs*,void*, const char *zSymbol) ptr; ptr* function() xDlSym; ``` I've never seen a construction like this before so my interpretation might be wrong!
