From 2cd972bb3eed7886a6b1d0d1b3ead24c8cf3fe4f Mon Sep 17 00:00:00 2001
From: Steven Le Rouzic <steven.lerouzic@gmail.com>
Date: Sat, 24 Aug 2024 11:53:39 +0200
Subject: More work

---
 asl/meta.hpp       |  5 ++++
 asl/meta_tests.cpp |  8 +++++++
 asl/ptr.hpp        | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++----
 asl/ptr_tests.cpp  | 20 +++++++++-------
 4 files changed, 88 insertions(+), 14 deletions(-)

(limited to 'asl')

diff --git a/asl/meta.hpp b/asl/meta.hpp
index 411d890..93bd1dd 100644
--- a/asl/meta.hpp
+++ b/asl/meta.hpp
@@ -85,6 +85,11 @@ template<typename T> struct _is_ref_helper<T&&> { static constexpr bool l = fals
 
 template<typename T> concept is_ref = _is_ref_helper<T>::l || _is_ref_helper<T>::r;
 
+template<typename T> struct _is_ptr_helper     : false_type {};
+template<typename T> struct _is_ptr_helper<T*> : true_type {};
+
+template<typename T> concept is_ptr = _is_ptr_helper<un_cv_t<T>>::value;
+
 template<typename T> struct _tame_helper { using type = T; };
 
 #define TAME_HELPER_IMPL(TRAILING)                                  \
diff --git a/asl/meta_tests.cpp b/asl/meta_tests.cpp
index 8293319..210e735 100644
--- a/asl/meta_tests.cpp
+++ b/asl/meta_tests.cpp
@@ -99,6 +99,14 @@ static_assert(!asl::is_ref<void>);
 static_assert(!asl::is_ref<void()>);
 static_assert(!asl::is_ref<void() const &&>);
 
+static_assert(asl::is_ptr<int*>);
+static_assert(asl::is_ptr<const int* const>);
+static_assert(asl::is_ptr<const volatile int*>);
+static_assert(!asl::is_ptr<int>);
+static_assert(!asl::is_ptr<void>);
+static_assert(!asl::is_ptr<void()>);
+static_assert(!asl::is_ptr<void() const &&>);
+
 static_assert(asl::is_same<int, asl::tame_t<int>>);
 static_assert(asl::is_same<int(), asl::tame_t<int()>>);
 static_assert(asl::is_same<int(float), asl::tame_t<int(float)>>);
diff --git a/asl/ptr.hpp b/asl/ptr.hpp
index 2d90e7b..9065e74 100644
--- a/asl/ptr.hpp
+++ b/asl/ptr.hpp
@@ -2,9 +2,33 @@
 
 #include "asl/integers.hpp"
 #include "asl/meta.hpp"
+#include "asl/utility.hpp"
 
 namespace asl
 {
+
+// @Todo Shitty span, improve this
+template<is_object T, isize_t kLen>
+struct span
+{
+    static constexpr bool kDynamic = kLen < 0;
+
+    using size_type = select_t<kDynamic, isize_t, empty>;
+
+    constexpr span(T* begin, isize_t len) requires kDynamic
+        : m_begin{begin}
+        , m_len{len}
+    {}
+
+    constexpr span(T* begin) requires (!kDynamic)
+        : m_begin{begin}
+        , m_len{}
+    {}
+    
+    T* m_begin;
+    ASL_NO_UNIQUE_ADDRESS size_type m_len;
+};
+
 namespace ptr_internal
 {
 
@@ -13,23 +37,37 @@ struct void_metadata
 {
     using metadata = empty;
     using pointee = T;
+
+    constexpr auto deref(pointee* ptr) { return ptr; }
 };
 
 template<is_array T>
 struct array_metadata {};
 
-template<typename T>
+template<is_object T>
 struct array_metadata<T[]>
 {
     using metadata = isize_t;
     using pointee = T;
+
+    constexpr auto deref(pointee* ptr)
+    {
+        return span<pointee, -1>(ptr, m_len);
+    }
+
+    isize_t m_len;
 };
 
-template<typename T, isize_t N>
+template<is_object T, isize_t N>
 struct array_metadata<T[N]>
 {
     using metadata = empty;
     using pointee = T[N];
+
+    constexpr auto deref(pointee* ptr)
+    {
+        return span<T, N>(static_cast<T*>(*ptr));
+    }
 };
 
 template<is_object T>
@@ -37,20 +75,26 @@ struct object_metadata
 {
     using metadata = empty;
     using pointee = T;
+
+    constexpr auto deref(pointee* ptr) { return ptr; }
 };
 
 template<is_func T>
 struct func_metadata
 {
     using metadata = empty;
-    using pointee = tame_t<T>*;
+    using pointee = tame_t<T>* const;
+
+    constexpr auto deref(pointee* ptr) { return *ptr; }
 };
 
 template<is_ref T>
 struct ref_metadata
 {
     using metadata = empty;
-    using pointee = un_ref_t<T>*;
+    using pointee = un_ref_t<T>* const;
+
+    constexpr auto deref(pointee* ptr) { return *ptr; }
 };
 
 template<is_void   T> void_metadata<T>   select_ptr_metadata(types<T>);
@@ -65,10 +109,25 @@ using metadata = decltype(select_ptr_metadata(types<T>{}));
 } // namespace ptr_internal
 
 template<typename T>
-concept ptr_metadata = requires
+concept ptr_metadata = requires (T metadata, typename T::pointee* ptr)
 {
     is_object<typename T::metadata>;
     is_object<typename T::pointee>;
+
+    { metadata.deref(ptr) };
+};
+
+template<typename T>
+class ptr
+{
+    using meta = ptr_internal::metadata<T>;
+    static_assert(ptr_metadata<meta>);
+
+    meta::pointee* m_ptr;
+    ASL_NO_UNIQUE_ADDRESS meta m_meta;
+    
+public:
+    
 };
 
 } // namespace asl
diff --git a/asl/ptr_tests.cpp b/asl/ptr_tests.cpp
index be27f0d..64c0ae2 100644
--- a/asl/ptr_tests.cpp
+++ b/asl/ptr_tests.cpp
@@ -1,14 +1,16 @@
 #include "asl/ptr.hpp"
 
-using namespace asl;
+static_assert(asl::ptr_metadata<asl::ptr_internal::metadata<void>>);
+static_assert(asl::ptr_metadata<asl::ptr_internal::metadata<int[]>>);
+static_assert(asl::ptr_metadata<asl::ptr_internal::metadata<int[56]>>);
+static_assert(asl::ptr_metadata<asl::ptr_internal::metadata<int>>);
+static_assert(asl::ptr_metadata<asl::ptr_internal::metadata<int()>>);
+static_assert(asl::ptr_metadata<asl::ptr_internal::metadata<int(int) const &>>);
+static_assert(asl::ptr_metadata<asl::ptr_internal::metadata<const int&>>);
+static_assert(asl::ptr_metadata<asl::ptr_internal::metadata<int&&>>);
 
-static_assert(ptr_metadata<ptr_internal::metadata<void>>);
-static_assert(ptr_metadata<ptr_internal::metadata<int[]>>);
-static_assert(ptr_metadata<ptr_internal::metadata<int[56]>>);
-static_assert(ptr_metadata<ptr_internal::metadata<int>>);
-static_assert(ptr_metadata<ptr_internal::metadata<int()>>);
-static_assert(ptr_metadata<ptr_internal::metadata<int(int) const &>>);
-static_assert(ptr_metadata<ptr_internal::metadata<const int&>>);
-static_assert(ptr_metadata<ptr_internal::metadata<int&&>>);
+static_assert(sizeof(asl::ptr<int>) == sizeof(int*));
+static_assert(sizeof(asl::ptr<int[]>) == sizeof(int*) * 2);
+static_assert(sizeof(asl::ptr<int[67]>) == sizeof(int*));
 
 int main() { return 0; }
-- 
cgit