From 93ef90aeb8ae804dc75ba25e26a82bd8665006b2 Mon Sep 17 00:00:00 2001
From: Patrick Wuttke <mewin@mewin.de>
Date: Wed, 16 Jul 2025 21:07:01 +0200
Subject: [PATCH] Added function_traits.

---
 source/mijin/util/traits.hpp | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/source/mijin/util/traits.hpp b/source/mijin/util/traits.hpp
index bddd0c0..4991efe 100644
--- a/source/mijin/util/traits.hpp
+++ b/source/mijin/util/traits.hpp
@@ -253,6 +253,42 @@ struct optional_base<T, false>
 template<typename T, bool enable>
 using optional_base_t = optional_base<T, enable>::type;
 
+namespace impl
+{
+template<typename TFunc>
+struct function_traits_base {};
+
+template<typename TResult, typename... TParams>
+struct function_traits_base<TResult (*)(TParams...)>
+{
+    using result_t = TResult;
+    using params_t = std::tuple<TParams...>;
+};
+
+template<typename TResult, typename TType, typename... TParams>
+struct function_traits_base<TResult (TType::*)(TParams...)>
+{
+    using result_t = TResult;
+    using params_t = std::tuple<TType*, TParams...>;
+};
+
+template<typename TResult, typename TType, typename... TParams>
+struct function_traits_base<TResult (TType::*)(TParams...) const>
+{
+    using result_t = TResult;
+    using params_t = std::tuple<const TType*, TParams...>;
+};
+}
+
+template<typename TFunc>
+struct function_traits : impl::function_traits_base<TFunc>
+{
+    static constexpr std::size_t NUM_PARAMS = std::tuple_size_v<typename impl::function_traits_base<TFunc>::params_t>;
+
+    template<std::size_t pos>
+    using param_t = std::tuple_element_t<pos, typename impl::function_traits_base<TFunc>::params_t>;
+};
+
 //
 // public functions
 //