From 19ce24de5e8ef31be2925074e962ae23aaf65be0 Mon Sep 17 00:00:00 2001
From: Steven Le Rouzic <steven.lerouzic@gmail.com>
Date: Fri, 23 Aug 2024 20:05:22 +0200
Subject: Some work on ptr

---
 asl/ptr.hpp | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 asl/ptr.hpp

(limited to 'asl/ptr.hpp')

diff --git a/asl/ptr.hpp b/asl/ptr.hpp
new file mode 100644
index 0000000..2d90e7b
--- /dev/null
+++ b/asl/ptr.hpp
@@ -0,0 +1,74 @@
+#pragma once
+
+#include "asl/integers.hpp"
+#include "asl/meta.hpp"
+
+namespace asl
+{
+namespace ptr_internal
+{
+
+template<is_void T>
+struct void_metadata
+{
+    using metadata = empty;
+    using pointee = T;
+};
+
+template<is_array T>
+struct array_metadata {};
+
+template<typename T>
+struct array_metadata<T[]>
+{
+    using metadata = isize_t;
+    using pointee = T;
+};
+
+template<typename T, isize_t N>
+struct array_metadata<T[N]>
+{
+    using metadata = empty;
+    using pointee = T[N];
+};
+
+template<is_object T>
+struct object_metadata
+{
+    using metadata = empty;
+    using pointee = T;
+};
+
+template<is_func T>
+struct func_metadata
+{
+    using metadata = empty;
+    using pointee = tame_t<T>*;
+};
+
+template<is_ref T>
+struct ref_metadata
+{
+    using metadata = empty;
+    using pointee = un_ref_t<T>*;
+};
+
+template<is_void   T> void_metadata<T>   select_ptr_metadata(types<T>);
+template<is_array  T> array_metadata<T>  select_ptr_metadata(types<T>);
+template<is_object T> object_metadata<T> select_ptr_metadata(types<T>) requires (!is_array<T>);
+template<is_func   T> func_metadata<T>   select_ptr_metadata(types<T>);
+template<is_ref    T> ref_metadata<T>    select_ptr_metadata(types<T>);
+
+template<typename T>
+using metadata = decltype(select_ptr_metadata(types<T>{}));
+
+} // namespace ptr_internal
+
+template<typename T>
+concept ptr_metadata = requires
+{
+    is_object<typename T::metadata>;
+    is_object<typename T::pointee>;
+};
+
+} // namespace asl
-- 
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