[FEAT] New Option 2 example, updated README, fixed crc_hash.hpp.

Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/example/option_2_example/example.cpp b/example/option_2_example/example.cpp
new file mode 100644
index 0000000..0ac6dbd
--- /dev/null
+++ b/example/option_2_example/example.cpp
@@ -0,0 +1,29 @@
+// Copyright 2025-2026, Amlal El Mahrouss (amlal@nekernel.org)
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+// Official repository: https://github.com/ocl-foss-org/core
+
+#include <ocl/crc_hash.hpp>
+#include <ocl/print.hpp>
+#include <ocl/option.hpp>
+
+struct invalid_callable
+{
+	explicit invalid_callable() = default;
+	void operator()(const char* reason)
+	{
+		ocl::detail::throw_runtime_error();
+	}
+};
+
+/// \brief Option Monad example
+int main(int argc, char** argv)
+{
+	ocl::option opt{ocl::eval_eq(nullptr, nullptr)};
+	opt.expect("option::incorrect");
+
+	opt = ocl::option{ocl::eval_eq(argv, nullptr)};
+	opt.expect<invalid_callable>("option::incorrect");
+
+	return EXIT_SUCCESS;
+}