Make continuable_base non copyable by default

* Actually there is no reason that the call hierarchy is copyable
  when looking at the fact that two types just cause distraction
  and bad usage.

include/continuable/continuable-base.hpp

@@ -157,10 +157,10 @@ public:
 
   /// \cond false
   continuable_base(continuable_base&&) = default;
-  continuable_base(continuable_base const&) = default;
+  continuable_base(continuable_base const&) = delete;
 
   continuable_base& operator=(continuable_base&&) = default;
-  continuable_base& operator=(continuable_base const&) = default;
+  continuable_base& operator=(continuable_base const&) = delete;
   /// \endcond
 
   /// The destructor automatically invokes the continuable_base

include/continuable/continuable-types.hpp

@@ -40,16 +40,9 @@
 namespace cti {
 // clang-format off
 namespace detail {
-/// A function which isn't size adjusted and copyable
-template<std::size_t Size, typename... Args>
-using function_adapter = fu2::function<Args...>;
 /// A function which isn't size adjusted and move only
 template<std::size_t, typename... Args>
 using unique_function_adapter = fu2::unique_function<Args...>;
-/// A function which is size adjusted and copyable
-template<std::size_t Size, typename... Args>
-using function_adjustable = fu2::function_base<true, true, Size,
-                                               true, false, Args...>;
 /// A function which is size adjusted and move only
 template<std::size_t Size, typename... Args>
 using unique_function_adjustable = fu2::function_base<true, false, Size,
@@ -57,13 +50,6 @@ using unique_function_adjustable = fu2::function_base<true, false, Size,
 
 /// We adjust the internal capacity of the outer function wrapper so
 /// we don't have to allocate twice when using `continuable<...>`.
-template<typename... Args>
-using trait_of = continuable_trait<
-  unique_function_adapter,
-  function_adjustable,
-  Args...
->;
-
 template<typename... Args>
 using unique_trait_of = continuable_trait<
   unique_function_adapter,
@@ -72,21 +58,12 @@ using unique_trait_of = continuable_trait<
 >;
 } // namespace detail
 
-/// Defines a copyable continuation type which uses the
-/// function2 backend for type erasure.
-///
-/// Usable like: `cti::continuable<int, float>`
-template <typename... Args>
-using continuable = typename detail::trait_of<
-  Args...
->::continuable;
-
 /// Defines a non-copyable continuation type which uses the
 /// function2 backend for type erasure.
 ///
-/// Usable like: `unique_continuable<int, float>`
+/// Usable like: `continuable<int, float>`
 template <typename... Args>
-using unique_continuable = typename detail::unique_trait_of<
+using continuable = typename detail::unique_trait_of<
   Args...
 >::continuable;
 

test/unit-test/multi/test-continuable-erasure.cpp

@@ -28,20 +28,20 @@
 TYPED_TEST(single_dimension_tests, is_eraseable) {
 
   {
-    cti::unique_continuable<int> erasure =
+    cti::continuable<int> erasure =
         cti::make_continuable<int>(supplier_of(0xDF));
 
     EXPECT_ASYNC_RESULT(std::move(erasure), 0xDF);
   }
 
   {
-    cti::unique_continuable<int> erasure = supplier_of(0xDF);
+    cti::continuable<int> erasure = supplier_of(0xDF);
 
     EXPECT_ASYNC_RESULT(std::move(erasure), 0xDF);
   }
 
   {
-    cti::unique_continuable<int> erasure = this->supply(0xDF);
+    cti::continuable<int> erasure = this->supply(0xDF);
 
     EXPECT_ASYNC_RESULT(std::move(erasure), 0xDF);
   }
@@ -49,8 +49,7 @@ TYPED_TEST(single_dimension_tests, is_eraseable) {
 
 TYPED_TEST(single_dimension_tests, is_callable) {
 
-  cti::unique_continuable<int, int> erased =
+  cti::continuable<int, int> erased = [](cti::promise<int, int>&& callback) {
-      [](cti::promise<int, int>&& callback) {
 
     std::move(callback)(0xDF, 0xDD);
   };

test/unit-test/test-continuable.hpp

@@ -166,13 +166,13 @@ using single_types = ::testing::Types<
 #if UNIT_TEST_STEP == 0
   provide_copyable
   // provide_erasure<cti::continuable>,
-  // provide_erasure<cti::unique_continuable>
+  // provide_erasure<cti::continuable>
 #elif UNIT_TEST_STEP == 1
   // Some instantiations out commented for compilation speed reasons
   // provide_continuation_and_left<provide_copyable>,
   provide_continuation_and_left<provide_unique>
   // provide_continuation_and_left<provide_erasure<cti::continuable>>,
-  // provide_continuation_and_left<provide_erasure<cti::unique_continuable>>,
+  // provide_continuation_and_left<provide_erasure<cti::continuable>>,
   // provide_continuation_and_right<provide_copyable>,
   // provide_continuation_and_right<provide_unique>,
   // provide_continuation_and_left<provide_erasure<cti::continuable>>