Add actionize().

src/alia/flow/actions.hpp

@@ -449,6 +449,24 @@ lambda_action(Perform perform)
     return lambda_action([]() { return true; }, perform);
 }
 
+// actionize(x) returns the action form of x (if it isn't already one).
+// Specifically, if x is a callable object, this returns lambda_action(x).
+// If x is an action, this returns x itself.
+template<class Action>
+std::enable_if_t<is_action_type<Action>::value, Action>
+actionize(Action x)
+{
+    return x;
+}
+template<
+    class Callable,
+    std::enable_if_t<!is_action_type<Callable>::value, int> = 0>
+auto
+actionize(Callable x)
+{
+    return lambda_action(std::move(x));
+}
+
 } // namespace alia
 
 #endif

unit_tests/flow/actions.cpp

@@ -275,3 +275,21 @@ TEST_CASE("action binding", "[flow][actions]")
     REQUIRE(!(lambda_action([]() { return false; }, [&](int) {}) << value(0))
                  .is_ready());
 }
+
+TEST_CASE("actionize an action", "[flow][actions]")
+{
+    int x = 0;
+    auto a = actionize(direct(x) <<= 1);
+    REQUIRE(a.is_ready());
+    perform_action(a);
+    REQUIRE(x == 1);
+}
+
+TEST_CASE("actionize a lambda", "[flow][actions]")
+{
+    int x = 0;
+    auto a = actionize([&] { x = 1; });
+    REQUIRE(a.is_ready());
+    perform_action(a);
+    REQUIRE(x == 1);
+}