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foreach.h

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00001 /* ResidualVM - A 3D game interpreter
00002  *
00003  * ResidualVM is the legal property of its developers, whose names
00004  * are too numerous to list here. Please refer to the COPYRIGHT
00005  * file distributed with this source distribution.
00006  *
00007  * This program is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU General Public License
00009  * as published by the Free Software Foundation; either version 2
00010  * of the License, or (at your option) any later version.
00011 
00012  * This program is distributed in the hope that it will be useful,
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00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016 
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00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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00022 
00023 #ifndef COMMON_FOREACH_H
00024 #define COMMON_FOREACH_H
00025 
00026 #include "common/scummsys.h"
00027 
00028 #if __cplusplus < 201103L
00029 
00030 namespace Common {
00031 
00032 class _Foreach_Container_Base_ {
00033 public:
00034     _Foreach_Container_Base_() : brk(1) { }
00035     mutable uint brk;
00036 };
00037 
00038 template<class T>
00039 class _Foreach_Container_ : public _Foreach_Container_Base_ {
00040 public:
00041     _Foreach_Container_(const T &co) : i(co.begin()), e(co.end()) { }
00042     void next() const {
00043         ++i;
00044         brk = 1;
00045     }
00046     bool end() const { return i == e; }
00047 
00048     mutable typename T::const_iterator i;
00049     typename T::const_iterator e;
00050 };
00051 
00052 template<class T>
00053 inline _Foreach_Container_<T> _Create_Foreach_Container_(const T &c) {
00054     return _Foreach_Container_<T>(c);
00055 }
00056 
00057 template<class T>
00058 inline const _Foreach_Container_<T> *_Get_Foreach_Container_(const _Foreach_Container_Base_ *c, const T &) {
00059     return static_cast<const _Foreach_Container_<T> *>(c);
00060 }
00061 
00062 }
00063 
00064 #define foreach(var, container) \
00065 for (const Common::_Foreach_Container_Base_ &_FOREACH_CONTAINER_ = Common::_Create_Foreach_Container_(container);\
00066     !Common::_Get_Foreach_Container_(&_FOREACH_CONTAINER_, container)->end(); \
00067     Common::_Get_Foreach_Container_(&_FOREACH_CONTAINER_, container)->next()) \
00068     for (var = *Common::_Get_Foreach_Container_(&_FOREACH_CONTAINER_, container)->i;\
00069         _FOREACH_CONTAINER_.brk > 0; --_FOREACH_CONTAINER_.brk)
00070 
00071 #else
00072 
00073 #define foreach(var, container) for (var : container)
00074 
00075 #endif
00076 
00077 #endif


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