From c72b19d54ea018be329bedd6b406ec1f4f11d00c Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Fri, 18 Nov 2022 12:18:27 +0300
Subject: [PATCH] Add bt::process helper for nodes without initialization &
 event processing

---
 libs/bt/include/psemek/bt/process.hpp | 47 +++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 libs/bt/include/psemek/bt/process.hpp

diff --git a/libs/bt/include/psemek/bt/process.hpp b/libs/bt/include/psemek/bt/process.hpp
new file mode 100644
index 00000000..cdf0cf5d
--- /dev/null
+++ b/libs/bt/include/psemek/bt/process.hpp
@@ -0,0 +1,47 @@
+#pragma once
+
+#include <psemek/bt/node.hpp>
+
+namespace psemek::bt
+{
+
+	template <typename Tree, typename ProcessFn>
+	struct process_node;
+
+	template <typename Time, typename Event, typename ... Args, typename ProcessFn>
+	struct process_node<tree<Time, Event, Args...>, ProcessFn>
+		: node<tree<Time, Event, Args...>>
+	{
+		using tree_type = tree<Time, Event, Args...>;
+		using node_type = node<tree_type>;
+		using typename node_type::finished;
+		using typename node_type::status;
+
+		process_node(ProcessFn && process_fn)
+			: process_fn_(std::move(process_fn))
+		{}
+
+		void start(Args ...) override
+		{}
+
+		status update(Time dt, Args ... args) override
+		{
+			return process_fn_(dt, args...);
+		}
+
+		bool event(Event const &, Args ...) override
+		{
+			return false;
+		}
+
+	private:
+		ProcessFn process_fn_;
+	};
+
+	template <typename Tree, typename ProcessFn>
+	node_ptr<Tree> process(ProcessFn && process_fn)
+	{
+		return std::make_unique<process_node<Tree, ProcessFn>>(std::move(process_fn));
+	}
+
+}