From 3fa247e3d4aa0df49414a0fa44b37101d780e2e7 Mon Sep 17 00:00:00 2001
From: Gary Talent <gary@drinkingtea.net>
Date: Sat, 23 Mar 2024 16:52:43 -0500
Subject: [PATCH] [ox/std] Add AnyPtr

---
 deps/ox/src/ox/std/anyptr.hpp | 73 +++++++++++++++++++++++++++++++++++
 deps/ox/src/ox/std/array.hpp  |  1 -
 deps/ox/src/ox/std/span.hpp   |  1 +
 deps/ox/src/ox/std/std.hpp    |  1 +
 4 files changed, 75 insertions(+), 1 deletion(-)
 create mode 100644 deps/ox/src/ox/std/anyptr.hpp

diff --git a/deps/ox/src/ox/std/anyptr.hpp b/deps/ox/src/ox/std/anyptr.hpp
new file mode 100644
index 00000000..3a8729f1
--- /dev/null
+++ b/deps/ox/src/ox/std/anyptr.hpp
@@ -0,0 +1,73 @@
+
+#pragma once
+
+#include "array.hpp"
+#include "span.hpp"
+
+namespace ox {
+
+class AnyPtr {
+	private:
+		struct WrapBase {
+			virtual ~WrapBase() = default;
+			virtual WrapBase *copyTo(ox::Span<char> s) noexcept = 0;
+			virtual operator bool() const noexcept = 0;
+		};
+
+		template<typename T>
+		struct Wrap: public WrapBase {
+			T *data{};
+			constexpr Wrap(T *pData) noexcept: data(pData) {
+			}
+			inline WrapBase *copyTo(ox::Span<char> s) noexcept override {
+				return new(s.data()) Wrap{data};
+			}
+			constexpr operator bool() const noexcept override {
+				return data != nullptr;
+			}
+		};
+
+		WrapBase *m_wrapPtr{};
+		ox::Array<char, sizeof(Wrap<void*>)> m_wrapData;
+	public:
+		constexpr AnyPtr() noexcept = default;
+		template<typename T>
+		inline AnyPtr(T *ptr) noexcept {
+			m_wrapPtr = new(m_wrapData.data()) Wrap(ptr);
+		}
+		inline AnyPtr(AnyPtr const&other) noexcept {
+			if (other) {
+				m_wrapPtr = other.m_wrapPtr->copyTo(m_wrapData);
+			}
+		}
+		template<typename T>
+		inline AnyPtr &operator=(T *ptr) noexcept {
+			m_wrapPtr = new(m_wrapData.data()) Wrap(ptr);
+			return *this;
+		}
+		inline AnyPtr &operator=(AnyPtr const&ptr) noexcept {
+			if (this != &ptr) {
+				if (ptr) {
+					m_wrapPtr = ptr.m_wrapPtr->copyTo(m_wrapData);
+				} else {
+					m_wrapPtr = nullptr;
+				}
+			}
+			return *this;
+		}
+		constexpr operator bool() const noexcept {
+			return m_wrapPtr && *m_wrapPtr;
+		}
+		template<typename T>
+		[[nodiscard]]
+		constexpr T *get() const noexcept {
+#ifdef OX_BARE_METAL
+			auto const out = static_cast<Wrap<T>*>(m_wrapPtr);
+#else
+			auto const out = dynamic_cast<Wrap<T>*>(m_wrapPtr);
+#endif
+			return out->data;
+		}
+};
+
+}
\ No newline at end of file
diff --git a/deps/ox/src/ox/std/array.hpp b/deps/ox/src/ox/std/array.hpp
index b18efc2b..bef35d09 100644
--- a/deps/ox/src/ox/std/array.hpp
+++ b/deps/ox/src/ox/std/array.hpp
@@ -13,7 +13,6 @@
 #include "initializerlist.hpp"
 #include "iterator.hpp"
 #include "math.hpp"
-#include "memory.hpp"
 #include "new.hpp"
 #include "types.hpp"
 #include "utility.hpp"
diff --git a/deps/ox/src/ox/std/span.hpp b/deps/ox/src/ox/std/span.hpp
index 1d0af4fb..da9272f8 100644
--- a/deps/ox/src/ox/std/span.hpp
+++ b/deps/ox/src/ox/std/span.hpp
@@ -8,6 +8,7 @@
 
 #pragma once
 
+#include "array.hpp"
 #include "bit.hpp"
 #include "iterator.hpp"
 #include "vector.hpp"
diff --git a/deps/ox/src/ox/std/std.hpp b/deps/ox/src/ox/std/std.hpp
index 70b110ea..0cf050d3 100644
--- a/deps/ox/src/ox/std/std.hpp
+++ b/deps/ox/src/ox/std/std.hpp
@@ -8,6 +8,7 @@
 
 #pragma once
 
+#include "anyptr.hpp"
 #include "array.hpp"
 #include "assert.hpp"
 #include "bit.hpp"