Fix standard incompetence found by MSVC

- requires-expression still not working, because they aren't supported yet outside of a concept

1 files changed, 19 insertions, 25 deletions

diff --git a/core/src/Model/Workflow/Workflow.hpp b/core/src/Model/Workflow/Workflow.hpp
index ded9bfb..161400e 100644
--- a/core/src/Model/Workflow/Workflow.hpp
+++ b/core/src/Model/Workflow/Workflow.hpp
@@ -5,6 +5,7 @@
 #include "cplt_fwd.hpp"
 
 #include <imgui_node_editor.h>
+#include <any>
 #include <cstddef>
 #include <cstdint>
 #include <filesystem>
@@ -240,34 +241,27 @@ public:
 
 	/* Graph rebuild */
 
-	struct GraphUpdateResult
+	enum GraphUpdateResult
 	{
-		struct Success
-		{
-		};
-
-		struct NoWorkToDo
-		{
-		};
-
-		struct UnsatisfiedDependencies
-		{
-			std::vector<uint32_t> UnsatisfiedNodes;
-		};
-
-		struct UnreachableNodes
-		{
-			std::vector<uint32_t> UnreachableNodes;
-		};
-
-		using T = std::variant<
-			Success,
-			NoWorkToDo,
-			UnsatisfiedDependencies,
-			UnreachableNodes>;
+		/// Successfully rebuilt graph dependent data.
+		/// Details: nothing is written.
+		GUR_Success,
+		/// Nothing has changed since last time UpdateGraph() was called.
+		/// Details: nothing is written.
+		GUR_NoWorkToDo,
+		/// Details: list of nodes is written.
+		GUR_UnsatisfiedDependencies,
+		/// Details: list of nodes is written.
+		GUR_UnreachableNodes,
 	};
 
-	GraphUpdateResult::T UpdateGraph();
+	using GraphUpdateDetails = std::variant<
+		// Case: nothing
+		std::monostate,
+		// Case: list of nodes (ids)
+		std::vector<uint32_t>>;
+
+	GraphUpdateResult UpdateGraph(GraphUpdateDetails* details = nullptr);
 
 	/* Serialization */