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Location: cpp/openttd-patchpack/source/src/group_type.h

r24755:9b2ef076754d 1.2 KiB text/x-c Show Annotation Show as Raw Download as Raw

Michael Lutz

Codechange: Don't use cpp_offsetof in the save/load code.

Many of the member variables that are used in save/load are inside types
that are not standard layout types. Using pointer arithmetics to determine
addresses of members inside types that are not standard layout is generally
undefined behaviour. If we'd use C++17, it is conditionally supported, which means
each compiler may or may not support it. And even then using it for individual
array elements is syntactically not supported the the standard offsetof function.

Unfortunately, the trickery employed for saving linkgraph settings causes quite some
clutter in the settings ini files.

/*
 * This file is part of OpenTTD.
 * OpenTTD 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, version 2.
 * OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file group_type.h Types of a group. */

#ifndef GROUP_TYPE_H
#define GROUP_TYPE_H

typedef uint16 GroupID; ///< Type for all group identifiers.

static const GroupID NEW_GROUP     = 0xFFFC; ///< Sentinel for a to-be-created group.
static const GroupID ALL_GROUP     = 0xFFFD; ///< All vehicles are in this group.
static const GroupID DEFAULT_GROUP = 0xFFFE; ///< Ungrouped vehicles are in this group.
static const GroupID INVALID_GROUP = 0xFFFF; ///< Sentinel for invalid groups.

static const uint MAX_LENGTH_GROUP_NAME_CHARS = 32; ///< The maximum length of a group name in characters including '\0'

struct Group;

#endif /* GROUP_TYPE_H */