diff --git a/include/continuable/continuable-promise-base.hpp b/include/continuable/continuable-promise-base.hpp
index 5828be2..8702f81 100644
--- a/include/continuable/continuable-promise-base.hpp
+++ b/include/continuable/continuable-promise-base.hpp
@@ -37,12 +37,14 @@
 #include <continuable/detail/api.hpp>
 #include <continuable/detail/hints.hpp>
 #include <continuable/detail/types.hpp>
+#include <continuable/detail/util.hpp>
 
 namespace cti {
 template <typename Data, typename Hint>
 class promise_base;
 template <typename Data, typename... Args>
-class promise_base<Data, detail::hints::signature_hint_tag<Args...>> {
+class promise_base<Data, detail::hints::signature_hint_tag<Args...>>
+    : detail::util::non_copyable {
   /// \cond false
   // The callback type
   Data data_;
@@ -59,27 +61,19 @@ public:
   promise_base(OData&& data) : data_(std::forward<OData>(data)) {
   }
 
-  /// \cond false
-  promise_base(promise_base&&) = default;
-  promise_base(promise_base const&) = default;
-
-  promise_base& operator=(promise_base&&) = default;
-  promise_base& operator=(promise_base const&) = default;
-  /// \endcond
+  /// Resolves the continuation with the given values
+  void operator()(Args... args) {
+    data_(std::move(args)...);
+  }
 
   /// Resolves the continuation with the given values
   void set_value(Args... args) {
     data_(std::move(args)...);
   }
 
-  /// Resolves the continuation with the given values
-  void operator()(Args... args) {
-    data_(std::move(args)...);
-  }
-
-  /// Resolves the continuation with the given error variable.
-  void set_error(detail::types::error_type error) {
-    data_(detail::types::dispatch_error_tag{}, std::move(error));
+  /// Resolves the continuation with the given exception
+  void set_exception(detail::types::error_type exception) {
+    data_(detail::types::dispatch_error_tag{}, std::move(exception));
   }
 };
 } // namespace cti
diff --git a/include/continuable/detail/base.hpp b/include/continuable/detail/base.hpp
index e3148b1..4b7dd27 100644
--- a/include/continuable/detail/base.hpp
+++ b/include/continuable/detail/base.hpp
@@ -309,7 +309,7 @@ struct result_callback<hints::signature_hint_tag<Args...>, Callback, Executor,
   }
 
   /// Resolves the continuation with the given error variable.
-  void set_error(types::error_type error) {
+  void set_exception(types::error_type error) {
     std::move(next_callback_)(types::dispatch_error_tag{}, std::move(error));
   }
 };
@@ -348,7 +348,7 @@ struct error_callback<hints::signature_hint_tag<Args...>, Callback, Executor,
   }
 
   /// Resolves the continuation with the given error variable.
-  void set_error(types::error_type error) {
+  void set_exception(types::error_type error) {
     std::move(next_callback_)(types::dispatch_error_tag{}, std::move(error));
   }
 };
@@ -364,7 +364,7 @@ struct empty_callback {
   void set_value(Args... /*error*/) {
   }
 
-  void set_error(types::error_type /*error*/) {
+  void set_exception(types::error_type /*error*/) {
   }
 };
 } // namespace callbacks
diff --git a/test/playground/test-playground.cpp b/test/playground/test-playground.cpp
index b6c3dc4..e470410 100644
--- a/test/playground/test-playground.cpp
+++ b/test/playground/test-playground.cpp
@@ -26,7 +26,7 @@
 
 cti::continuable<std::string> http_request(std::string url) {
   return [](cti::promise<std::string> promise) {
-    promise.set_error(nullptr);
+    promise.set_exception(nullptr);
     promise.set_value("");
     promise("");
   };
@@ -34,7 +34,7 @@ cti::continuable<std::string> http_request(std::string url) {
 
 auto http_request2(std::string url) {
   return cti::make_continuable<std::string>([](auto&& promise) {
-    promise.set_error(nullptr);
+    promise.set_exception(nullptr);
     promise.set_value("");
     promise("");
   });