Complex C typedef decl replacement

[Jacob Carlborg]

On 2012-11-23 14:26, Andrey wrote:
> Hello everyone!
>
> What a proper replacement is for C declarations like this?
>
> typedef void (APIENTRYP PFNGLGETCOMPRESSEDTEXIMAGEPROC) (GLenum target,
> GLint level, GLvoid *img);

I would guess that APIENTRYP and PFNGLGETCOMPRESSEDTEXIMAGEPROC are 
macros. You first have to look up what those evaluate to. This is 
probably a function pointer.

> typedef GLvoid (APIENTRY * PFNGLMULTIDRAWARRAYSPROC) (GLenum mode, const
> GLint *first, const GLsizei *count, GLsizei primcount);

Same as above.

> And this:
>
> void glAlphaFunc( GLenum func, GLclampf ref ); //ref is not acceptable
> as var name in D

Just use a difference name, like ref_, the parameter names doesn't 
matter when creating bindings.

> alias void (* _GLUfuncptr)(); //how to make a proper aliasing of a
> function pointer?

A function pointer in D looks like:

void function () foo;

So to make an alias to the above function pointer, it would look like this:

extern (C) void function () _GLUfuncptr;


Take a look at DStep, a tool for automatically converting C headers to D 
modules:

https://github.com/jacob-carlborg/dstep

-- 
/Jacob Carlborg