On Tuesday, 8 August 2017 at 21:04:23 UTC, Jacob Carlborg wrote:
On 2017-08-08 20:51, Johan Engelen wrote:
Hi all,
   Currently, it is not possible to call the C++ function "void
foo(Klass&)" when Klass is an extern(C++) _class_ on the D side. You have to declare Klass as a D _struct_, otherwise there is no way to get the correct mangling. When Klass has virtual functions, you're hosed.

For more context (involving "const"), see:

Is this problem on anybody's radar?
What are the ideas to resolve this issue, or are we content never to
solve it?

One way to do it, that might be a bit confusing, is to force the declaration of the function to explicitly specify a pointer or a reference. Currently it looks like it's an implicit pointer.

extern (C++) class Klass {}
void foo(Klass*); // ok
void foo(ref Klass); // ok
void foo(Klass); // error

Of course, there's always pragma(mangle) as well.

sorry for hijacking the thread but i have a similar question:

i was wondering if i could write a wrapper for a C++11 library called cpr. in one of its header files (https://github.com/whoshuu/cpr/blob/master/include/cpr/auth.h#L13) it has a generic constructor that initializes its member fields. i had no idea as to how to do it. then i came up with the following line:

    extern (C++, cpr) {
        this(UT, PT)(ref UT username, ref PT password) { ... }

when i compiled it with the .a lib given, it worked. do you guys think i did it right? the &

my second question is: i have no idea what's going on in this file: https://github.com/whoshuu/cpr/blob/master/include/cpr/body.h i'd appreciate some pointers.

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