From a85040b0c2d2936ec65a81bdebdea586e90b7159 Mon Sep 17 00:00:00 2001
From: Denis Blank <denis.blank@outlook.com>
Date: Thu, 28 Dec 2017 05:26:29 +0100
Subject: [PATCH] Basic skeleton for coroutine_traits

---
 include/continuable/detail/awaiting.hpp   | 34 +++++++++++++++++++++++
 test/unit-test/test-continuable-await.cpp | 11 ++++++++
 2 files changed, 45 insertions(+)

diff --git a/include/continuable/detail/awaiting.hpp b/include/continuable/detail/awaiting.hpp
index 7aeb86e..ef6721b 100644
--- a/include/continuable/detail/awaiting.hpp
+++ b/include/continuable/detail/awaiting.hpp
@@ -41,6 +41,7 @@
 #include <continuable/detail/base.hpp>
 #include <continuable/detail/expected.hpp>
 #include <continuable/detail/features.hpp>
+#include <continuable/detail/hints.hpp>
 #include <continuable/detail/traits.hpp>
 #include <continuable/detail/types.hpp>
 #include <continuable/detail/util.hpp>
@@ -176,5 +177,38 @@ auto create_awaiter(T&& continuable) {
 } // namespace detail
 } // namespace cti
 
+namespace std {
+namespace experimental {
+template <typename Data, typename... Args, typename... FunctionArgs>
+struct coroutine_traits<
+    cti::continuable_base<Data,
+                          cti::detail::hints::signature_hint_tag<Args...>>,
+    FunctionArgs...> /*{
+  struct promise_type {
+    // boost::promise<R> p;
+    auto get_return_object() {
+      // return p.get_future();
+    }
+    suspend_always initial_suspend() {
+      return {};
+    }
+    suspend_never final_suspend() {
+      return {};
+    }
+    void set_exception(std::exception_ptr e) {
+      // p.set_exception(std::move(e));
+    }
+    void unhandled_exception() {
+      // p.set_exception(std::current_exception());
+    }
+    template <typename U>
+    void return_value(U&& u) {
+      // p.set_value(std::forward<U>(u));
+    }
+  };
+}*/;
+} // namespace experimental
+} // namespace std
+
 #endif // CONTINUABLE_HAS_EXPERIMENTAL_COROUTINE
 #endif // CONTINUABLE_DETAIL_UTIL_HPP_INCLUDED__
diff --git a/test/unit-test/test-continuable-await.cpp b/test/unit-test/test-continuable-await.cpp
index 9e87407..aed1e78 100644
--- a/test/unit-test/test-continuable-await.cpp
+++ b/test/unit-test/test-continuable-await.cpp
@@ -117,6 +117,17 @@ TYPED_TEST(single_dimension_tests, are_awaitable_with_exceptions) {
       })));
 }
 
+// TODO Implement this later
+//
+//  static cti::continuable<int> async_await() {
+//   co_await cti::make_continuable<void>([](auto&& promise) {
+//      ...
+//     promise.set_value();
+//   });
+//
+//   co_return 1;
+// }
+
 #endif // CONTINUABLE_WITH_NO_EXCEPTIONS
 
 #endif // CONTINUABLE_HAS_EXPERIMENTAL_COROUTINE