File: wexception.h

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/*
 * Copyright (C) 2002, 2003, 2009, 2016 by the Widelands Development Team
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 */

#ifndef WL_BASE_WEXCEPTION_H
#define WL_BASE_WEXCEPTION_H

#include <cstring>
#include <exception>
#include <string>

#include <stdint.h>

#include "base/macros.h"

#ifndef PRINTF_FORMAT
#ifdef __GNUC__
#define PRINTF_FORMAT(b, c) __attribute__((__format__(__printf__, b, c)))
#else
#define PRINTF_FORMAT(b, c)
#endif
#endif

/** class wexception
 *
 * Stupid, simple exception class. It has the nice bonus that you can give it
 * sprintf()-style format strings
 */
struct WException : public std::exception {
	explicit WException(char const* const file, uint32_t const line, char const* const fmt, ...)
	   PRINTF_FORMAT(4, 5);

	/**
	 * The target of the returned pointer remains valid during the lifetime of
	 * the WException object.
	 */
	const char* what() const noexcept override;

protected:
	WException() {
	}
	std::string what_;
};

#define wexception(...) WException(__FILE__, __LINE__, __VA_ARGS__)

// Throws a wexception for unreachable code.
#define NEVER_HERE() throw WException(__FILE__, __LINE__, "Unreachable code was reached.")

#endif  // end of include guard: WL_BASE_WEXCEPTION_H