+static NSBlock *CYCastNSBlock(CYPool &pool, JSContextRef context, JSValueRef value, sig::Signature *signature) {
+ if (JSValueIsNull(context, value))
+ return nil;
+ JSObjectRef object(CYCastJSObject(context, value));
+
+ if (JSValueIsObjectOfClass(context, object, FunctionInstance_))
+ return reinterpret_cast<Instance *>(JSObjectGetPrivate(object))->GetValue();
+
+ if (JSValueIsObjectOfClass(context, object, Instance_)) {
+ _assert(reinterpret_cast<Instance *>(JSObjectGetPrivate(object))->GetValue() == nil);
+ return nil;
+ }
+
+ _assert(JSObjectIsFunction(context, object));
+
+ _assert(signature != NULL);
+ _assert(signature->count != 0);
+
+ sig::Signature modified;
+ modified.count = signature->count + 1;
+ modified.elements = new(pool) sig::Element[modified.count];
+
+ modified.elements[0] = signature->elements[0];
+ memcpy(modified.elements + 2, signature->elements + 1, sizeof(sig::Element) * (signature->count - 1));
+
+ modified.elements[1].name = NULL;
+ modified.elements[1].type = new(pool) sig::Type();
+ modified.elements[1].offset = _not(size_t);
+
+ memset(modified.elements[1].type, 0, sizeof(sig::Type));
+ modified.elements[1].type->primitive = sig::object_P;
+
+ return CYMakeBlock(context, object, modified);
+}
+