From 4de3aeb87c78a13f8e493e48477220084610c076 Mon Sep 17 00:00:00 2001
From: Brett Laptop <tri11paragon@tpgc.me>
Date: Wed, 10 Jul 2024 20:41:26 -0400
Subject: [PATCH] meta

---
 CMakeLists.txt         |  2 +-
 include/blt/std/meta.h | 62 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 63 insertions(+), 1 deletion(-)
 create mode 100644 include/blt/std/meta.h

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 61ec34c..64da85d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.20)
 include(cmake/color.cmake)
 
-set(BLT_VERSION 0.18.3)
+set(BLT_VERSION 0.18.4)
 set(BLT_TEST_VERSION 0.0.1)
 
 set(BLT_TARGET BLT)
diff --git a/include/blt/std/meta.h b/include/blt/std/meta.h
new file mode 100644
index 0000000..cf2904e
--- /dev/null
+++ b/include/blt/std/meta.h
@@ -0,0 +1,62 @@
+#pragma once
+/*
+ *  Copyright (C) 2024  Brett Terpstra
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef BLT_META_H
+#define BLT_META_H
+
+#include <blt/std/types.h>
+#include <utility>
+
+namespace blt::meta
+{
+    template<typename IFirst, typename... IArgs>
+    struct arg_helper
+    {
+        using First = IFirst;
+        using Next = arg_helper<IArgs...>;
+    };
+    
+    template<>
+    struct arg_helper<void>
+    {
+        using First = void;
+        using Next = void;
+    };
+    
+    template<typename TheLambda, typename>
+    struct lambda_helper
+    {
+        using Lambda = TheLambda;
+    };
+    
+    template<typename TheLambda, typename IReturn, typename IClass, typename... LArgs>
+    struct lambda_helper<TheLambda, IReturn(IClass::*)(LArgs...)>
+    {
+        using Lambda = TheLambda;
+        using Return = IReturn;
+        using Class = IClass;
+        using Args = arg_helper<LArgs...>;
+    };
+    
+    template<typename Lambda>
+    lambda_helper(Lambda) -> lambda_helper<Lambda, decltype(&Lambda::operator())>;
+    
+    
+}
+
+#endif //BLT_GP_META_H