1 files changed, 134 insertions, 0 deletions
diff --git a/include/ocl/logic/opt.hpp b/include/ocl/logic/opt.hpp
new file mode 100644
index 0000000..ba76885
--- /dev/null
+++ b/include/ocl/logic/opt.hpp
@@ -0,0 +1,134 @@
+/*
+ * File: opt.hpp
+ * Author: Amlal El Mahrouss,
+ * Copyright 2023-2025, Amlal El Mahrouss, Licensed under the Boost Software License
+ */
+
+#ifndef _OCL_OPT_HPP
+#define _OCL_OPT_HPP
+
+#include <except/error.hpp>
+#include <utility>
+
+namespace ocl
+{
+	enum class return_type
+	{
+		invalid = 0,
+		okay	= 100,
+		err,
+		count = err - okay + 1,
+	};
+
+	template <typename char_type = char>
+	struct opt final
+	{
+		explicit opt(const return_type& return_type)
+			: m_ret(return_type)
+		{
+		}
+
+		opt& expect(const char_type* input)
+		{
+			if (m_ret == return_type::err)
+			{
+				throw std::runtime_error(input ? input : "opt::error");
+			}
+
+			return *this;
+		}
+
+		template <typename ErrorHandler>
+		opt& expect_or_handle(const char_type* input)
+		{
+			if (m_ret == return_type::err)
+			{
+				ErrorHandler err_handler;
+				err_handler(input ? input : "opt::error");
+			}
+
+			return *this;
+		}
+
+	private:
+		return_type m_ret{return_type::invalid};
+	};
+
+	template <typename Teller, typename... Lst>
+	inline return_type eval(Teller tell, Lst&&... arg)
+	{
+		return tell(std::forward<Lst>(arg)...) ? return_type::okay : return_type::err;
+	}
+
+	namespace traits
+	{
+		struct int_eq_teller
+		{
+			explicit int_eq_teller()
+			{
+			}
+
+			bool operator()(int a, int b)
+			{
+				return (a == b);
+			}
+		};
+
+		struct int_greater_than_teller
+		{
+			explicit int_greater_than_teller()
+			{
+			}
+
+			bool operator()(int a, int b)
+			{
+				return (a > b);
+			}
+		};
+
+		struct int_less_than_teller
+		{
+			explicit int_less_than_teller()
+			{
+			}
+
+			bool operator()(int a, int b)
+			{
+				return (a < b);
+			}
+		};
+	} // namespace traits
+
+	template <typename... Lst>
+	inline return_type eval_less_than(Lst&&... arg)
+	{
+		static traits::int_less_than_teller eq;
+		return eq(std::forward<Lst>(arg)...) ? return_type::okay : return_type::err;
+	}
+
+	template <typename... Lst>
+	inline return_type eval_eq(Lst&&... arg)
+	{
+		static traits::int_eq_teller less_than;
+		return less_than(std::forward<Lst>(arg)...) ? return_type::okay : return_type::err;
+	}
+
+	template <typename... Lst>
+	inline return_type eval_greater_than(Lst&&... arg)
+	{
+		static traits::int_greater_than_teller greater_than;
+		return greater_than(std::forward<Lst>(arg)...) ? return_type::okay : return_type::err;
+	}
+
+	inline return_type eval_true() noexcept
+	{
+		return return_type::okay;
+	}
+
+	inline return_type eval_false() noexcept
+	{
+		return return_type::err;
+	}
+} // namespace ocl
+
+#endif /* ifndef _OCL_OPT_HPP */
+\ No newline at end of file