Copying over my question from stack overflow:
(http://stackoverflow.com/questions/38062386/using-either-a-block-or-c-lambda-for-a-c-function-pointer-api
<http://stackoverflow.com/questions/38062386/using-either-a-block-or-c-lambda-for-a-c-function-pointer-api>)
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<http://stackoverflow.com/questions/38062386/using-either-a-block-or-c-lambda-for-a-c-function-pointer-api#>
Working with JavaScriptCore's C API and I have this C function pointer
signature:
typedef void
(*JSObjectInitializeCallback) (JSContextRef ctx, JSObjectRef object);
And here is a problematic usage:
JSClassDefinition def = kJSClassDefinitionEmpty;
// This is that previously typed out signature being used
def.initialize = [](JSContextRef ctx, JSObjectRef obj){
CAMLlocal2(init_context, init_obj);
init_context = caml_alloc(sizeof(JSContextRef), Abstract_tag);
init_obj = caml_alloc(sizeof(JSObjectRef), Abstract_tag);
Store_field(init_context, 0, (value)ctx);
Store_field(init_obj, 0, (value)obj);
// Need to call this but can't because class_def is
// from the outside and can't be put in the capture list
//caml_callback2(Field(class_def, 5), init_context, init_obj);
};
So I'm not sure what's the right way to get around this. I don't want to start
defining C functions all over the place because I need to create these
callbacks dynamically and I'm not sure how to do the global state solution
correctly because that will introduce more issues of locking correctly, etc.
I'm also open to using objective-C blocks, just the blocks, no objective-C. Saw
some mentions of std::function but I don't understand C++ well enough to use
that API.
Looking through the Apple Objective-C layer on top of JSC to see how they did
it....
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