1 files changed, 108 insertions, 0 deletions
diff --git a/include/ocl/is_same.hpp b/include/ocl/is_same.hpp
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+++ b/include/ocl/is_same.hpp
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+/*
+ * File: is_same.hpp
+ * Purpose: Equivalence header.
+ * Author: Amlal El Mahrouss (amlal@nekernel.org)
+ * Copyright 2025, Amlal El Mahrouss, licensed under the Boost Software License.
+ */
+
+#pragma once
+
+#include <ocl/detail/config.hpp>
+
+/// @brief OCL equivalence namespace.
+namespace ocl
+{
+	template <typename T>
+	struct basic_hash
+	{
+		using result_type = typename T::result_type;
+		using type		  = T;
+
+		/// @brief hash from T's result_type.
+		static result_type hash()
+		{
+			return T{}.hash();
+		}
+	};
+
+	template <typename T, typename U>
+	struct is_same
+	{
+		static constexpr bool value = false;
+
+		/// @brief check if hash matches what we expect.
+		constexpr bool operator()() noexcept
+		{
+			return T::hash() == U::hash();
+		}
+	};
+
+	template <typename T>
+	struct is_same<T, T>
+	{
+		static constexpr bool value = true;
+	};
+
+	template <typename T, typename U>
+	struct is_not_same
+	{
+		static constexpr bool value = true;
+
+		constexpr bool operator()() noexcept
+		{
+			return T::hash() != U::hash();
+		}
+	};
+
+	template <typename T>
+	struct is_not_same<T, T>
+	{
+		static constexpr bool value = false;
+	};
+
+	template <typename T>
+	struct equiv_is_int8
+	{
+	private:
+		T left_ = 127, right_ = 127;
+
+	public:
+		using result_type = T;
+
+		constexpr result_type hash()
+		{
+			return (left_ + right_) < 1;
+		}
+	};
+
+	template <typename T>
+	struct equiv_not_int8
+	{
+	private:
+		// these shall overflow if not int8.
+		T left_ = 127, right_ = 127;
+
+	public:
+		using result_type = T;
+
+		constexpr result_type hash()
+		{
+			return (left_ + right_) > 0;
+		}
+	};
+
+	template <typename T>
+	struct equiv_is_real
+	{
+	private:
+		T left_ = 5, right_ = 3;
+
+	public:
+		using result_type = T;
+
+		constexpr result_type hash()
+		{
+			return left_ / right_ == 1;
+		}
+	};
+} // namespace ocl