More work on workflows

- WorkflowStep -> WorkflowNode
- Added initial kinds of WorkflowNode's

1 files changed, 27 insertions, 0 deletions

diff --git a/core/src/Utils/Variant.hpp b/core/src/Utils/Variant.hpp
new file mode 100644
index 0000000..7fdb2dc
--- /dev/null
+++ b/core/src/Utils/Variant.hpp
@@ -0,0 +1,27 @@
+#pragma once
+
+#include <utility>
+#include <variant>
+
+template <class... Ts>
+struct Overloaded : Ts... { using Ts::operator()...; };
+template <class... Ts>
+Overloaded(Ts...) -> Overloaded<Ts...>;
+
+template <class... Args>
+struct VariantCastProxy {
+	std::variant<Args...> v;
+
+	template <class... ToArgs>
+	operator std::variant<ToArgs...>() const {
+		return std::visit(
+			[](auto&& arg) -> std::variant<ToArgs...> { return arg; },
+			v);
+	}
+};
+
+/// Use snake_case naming to align with `static_cast`, `dynamic_cast`, etc..
+template <class... Args>
+auto variant_cast(std::variant<Args...> v) -> VariantCastProxy<Args...> {
+	return { std::move(v) };
+}