From d2cf7c7a5c9c83e0607d2d7adf1d1e23192ae016 Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Wed, 24 Jan 2024 14:30:04 +0200
Subject: [PATCH] BAN: Implement basic Atomic class that wraps gcc builtins

---
 BAN/include/BAN/Atomic.h | 42 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 BAN/include/BAN/Atomic.h

diff --git a/BAN/include/BAN/Atomic.h b/BAN/include/BAN/Atomic.h
new file mode 100644
index 000000000..52a2ff7a0
--- /dev/null
+++ b/BAN/include/BAN/Atomic.h
@@ -0,0 +1,42 @@
+#pragma once
+
+namespace BAN
+{
+
+	template<typename T, int MEM_ORDER = __ATOMIC_SEQ_CST>
+	requires requires { __atomic_always_lock_free(sizeof(T), 0); }
+	class Atomic
+	{
+		Atomic(const Atomic&) = delete;
+		Atomic(Atomic&&) = delete;
+		Atomic& operator=(const Atomic&) volatile = delete;
+		Atomic& operator=(Atomic&&) volatile = delete;
+
+	public:
+		constexpr Atomic() : m_value(0) {}
+		constexpr Atomic(T val) : m_value(val) {}
+
+		inline T load() const volatile		{ return __atomic_load_n(&m_value, MEM_ORDER); }
+		inline void store(T val) volatile	{ __atomic_store_n(&m_value, val, MEM_ORDER); }
+
+		inline T operator=(T val) volatile { store(val); return val; }
+
+		inline operator T() const volatile { return load(); }
+
+		inline T operator+=(T val) volatile { return __atomic_add_fetch(&m_value, val, MEM_ORDER); }
+		inline T operator-=(T val) volatile { return __atomic_sub_fetch(&m_value, val, MEM_ORDER); }
+		inline T operator&=(T val) volatile { return __atomic_and_fetch(&m_value, val, MEM_ORDER); }
+		inline T operator^=(T val) volatile { return __atomic_xor_fetch(&m_value, val, MEM_ORDER); }
+		inline T operator|=(T val) volatile { return __atomic_or_fetch(&m_value, val, MEM_ORDER); }
+
+		inline T operator--() volatile { return __atomic_sub_fetch(&m_value, 1, MEM_ORDER); }
+		inline T operator++() volatile { return __atomic_add_fetch(&m_value, 1, MEM_ORDER); }
+
+		inline T operator--(int) volatile { return __atomic_fetch_sub(&m_value, 1, MEM_ORDER); }
+		inline T operator++(int) volatile { return __atomic_fetch_add(&m_value, 1, MEM_ORDER); }
+
+	private:
+		T m_value;
+	};
+
+}
\ No newline at end of file