> On Apr 17, 2017, at 6:19 PM, Rick Mann via swift-users
> <swift-users@swift.org> wrote:
>
> I'm trying to make a module out of a C library and header file. It has at
> least one empty struct:
>
> struct lgs_context_t {};
>
> and a function:
>
> LGS_EXPORT struct lgs_context_t* lgs_init(const lgs_context_params_t* params);
>
> Swift sees the function, I can call it and assign the result to a variable,
> but Xcode (as usual) fails to show me what it thinks the type is. So I can't
> declare a class member to hold the returned pointer.
>
> I'm trying to declare the member like this:
>
> var ctx: lgs_context_t? // Use of undeclared type
> 'lgs_context_t'
>
> I finally tried calling it like this:
>
> let ctx: UnsafeMutablePointer = lgs_init(...)
>
> and the resulting error message gave me OpaquePointer. But couldn't it just
> typealias lgs_context_t to OpaquePointer?
>
> Is there any way to do this in the modulemap?
>
> Thanks!
The compiler uses OpaquePointer for pointers to incomplete types in C. It
sounds like you left lgs_context_t declared but not defined in your header, in
other words you wrote 'struct lgs_context_t;' without braces. If it were truly
defined to be empty, then the type should have been imported.
-Joe
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