/*
	SPDX-License-Identifier: MIT
	Copyright © 2023-2025 Amebis
*/

#pragma once

#include "compat.hpp"
#include <stdexcept>

namespace stdex
{
	///
	/// User cancelled exception
	///
	class user_cancelled : public std::runtime_error
	{
	public:
		///
		/// Constructs an exception
		///
		/// \param[in] msg  Error message
		///
		user_cancelled(_In_opt_z_ const char* msg = "operation cancelled") : runtime_error(msg) {}
	};

	///
	/// Concatenates error messages when exception is nested.
	///
	/// \param ex  Exception
	///
	/// \returns Concatenated exception messages with ": " delimiter.
	///
	inline std::string exception_msg(const std::exception& ex)
	{
		try { std::rethrow_if_nested(ex); }
		catch (const std::exception& nested_ex) {
			return std::string(ex.what()) + ": " + exception_msg(nested_ex);
		}
		catch (...) {}
		return ex.what();
	}
}