第一版讨论稿。

interface/future.cpp

@@ -0,0 +1,37 @@
+
+enum e_future_error
+{
+    FUTURE_ERROR_CANCEL
+    FUTURE_ERROR_EXCEPTION,
+    FUTURE_ERROR_TIMEOUT
+}
+
+typedef void (*future_cb_success_t)(void * result, void * user);
+typedef void (*future_cb_failed_t)(enum e_future_error err, const char * what, void * user);
+
+struct future
+{
+    void * user;
+    future_cb_success_t * cb_success;
+    future_cb_failed_t * cb_failed;
+};
+
+struct promise
+{
+    struct future f;
+    void * ctx;
+}
+
+typedef void * promise_t;
+void future_cancel(struct future * future)
+{
+    future->cancel();
+}
+
+void promise_success(struct promisc *, void * result);
+void promise_fail();
+
+struct future *  XXXXXRpc()
+{
+    cancel = ___XXXXCancel()
+};