Re: Interfacing with C - calling member function of D struct from C?

[unleashy via Digitalmars-d-learn]

On Sunday, 25 June 2017 at 02:09:53 UTC, Adam D. Ruppe wrote:

On Sunday, 25 June 2017 at 02:05:35 UTC, unleashy wrote:

How would I call `addToBar` from C code?


You don't. Instead write it like:

struct Foo
{
int bar;
}

extern(C) void addToBar(Foo* foo, int what) {
   foo.bar += what;
}


Then define it in C the same way and you call it the normal way 
from C.


But from D, you can UFCS call it:

Foo* foo = new Foo();
foo.addToBar(5); // cool


though I'd prolly just call it from D the same way you do from 
C too.


Thank you, this is what I suspected :)

Re: Interfacing with C - calling member function of D struct from C?

[Adam D. Ruppe via Digitalmars-d-learn]

On Sunday, 25 June 2017 at 02:05:35 UTC, unleashy wrote:

How would I call `addToBar` from C code?


You don't. Instead write it like:

struct Foo
{
int bar;
}

extern(C) void addToBar(Foo* foo, int what) {
   foo.bar += what;
}


Then define it in C the same way and you call it the normal way 
from C.


But from D, you can UFCS call it:

Foo* foo = new Foo();
foo.addToBar(5); // cool


though I'd prolly just call it from D the same way you do from C 
too.

Interfacing with C - calling member function of D struct from C?

[unleashy via Digitalmars-d-learn]

Hello! If I have a D struct like:

struct Foo
{
int bar;

void addToBar(int what) {
bar += what;
}
}

How would I call `addToBar` from C code? Would I need to put the 
`addToBar` function outside of the struct and mark it as `extern 
(C)` and in normal D code take advantage of UFCS or is there some 
magic C incantation?


I've scoured the forums and other places for anything about this 
but couldn't find any information whatsoever... so yeah. (or my 
Google-fu is terrible)


Thanks!