error: macro "min" passed 3 arguments, but takes just 2 error: expected ‘)’ before ‘const’ 解决方法

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本文解决了在Ubuntu下使用g++编译C++程序时遇到的宏定义冲突问题，通过取消定义max和min宏，避免了与STL中同名宏冲突导致的编译错误。

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最近在ubuntu下编译一个c++的solution，好几个project都得到如下的奇怪错误：

In file included from /usr/include/c++/4.6/bits/char_traits.h:41:0,
from /usr/include/c++/4.6/ios:41,
from /usr/include/c++/4.6/istream:40,
from /share1/linux_1579/include/ospace/std/istream:13,
from /share1/linux_1579/include/ospace/osstd/iterator.h:20,
from /share1/linux_1579/include/ospace/osstd/list.h:16,
from /share1/linux_1579/include/ospace/std/list:15,
from ../../include/LrwVUserVars.h:70,
from ../../include/LrwLogicMgrUtil.h:19,
from LrwLogicMgrUtil.cpp:6:

/usr/include/c++/4.6/bits/stl_algobase.h:233:56: error: macro "min" passed 3 arguments, but takes just 2

/usr/include/c++/4.6/bits/stl_algobase.h:254:56: error: macro "max" passed 3 arguments, but takes just 2
In file included from /usr/include/c++/4.6/bits/char_traits.h:41:0,
from /usr/include/c++/4.6/ios:41,
from /usr/include/c++/4.6/istream:40,
from /share1/linux_1579/include/ospace/std/istream:13,
from /share1/linux_1579/include/ospace/osstd/iterator.h:20,
from /share1/linux_1579/include/ospace/osstd/list.h:16,
from /share1/linux_1579/include/ospace/std/list:15,
from ../../include/LrwVUserVars.h:70,
from ../../include/LrwLogicMgrUtil.h:19,
from LrwLogicMgrUtil.cpp:6:
/usr/include/c++/4.6/bits/stl_algobase.h:187:5: error: expected unqualified-id before ‘const’
/usr/include/c++/4.6/bits/stl_algobase.h:187:5: error: expected ‘)’ before ‘const’
/usr/include/c++/4.6/bits/stl_algobase.h:187:5: error: expected initializer before ‘const’
/usr/include/c++/4.6/bits/stl_algobase.h:210:5: error: expected unqualified-id before ‘const’
/usr/include/c++/4.6/bits/stl_algobase.h:210:5: error: expected ‘)’ before ‘const’
/usr/include/c++/4.6/bits/stl_algobase.h:210:5: error: expected initializer before ‘const’
/usr/include/c++/4.6/bits/stl_algobase.h:233:5: error: ‘std::min’ declared as an ‘inline’ variable
/usr/include/c++/4.6/bits/stl_algobase.h:233:5: error: template declaration of ‘const _Tp& std::min’
/usr/include/c++/4.6/bits/stl_algobase.h:236:7: error: expected primary-expression before ‘if’
/usr/include/c++/4.6/bits/stl_algobase.h:236:7: error: expected ‘}’ before ‘if’
/usr/include/c++/4.6/bits/stl_algobase.h:238:7: error: expected unqualified-id before ‘return’
/usr/include/c++/4.6/bits/stl_algobase.h:254:5: error: ‘max’ declared as an ‘inline’ variable
/usr/include/c++/4.6/bits/stl_algobase.h:254:5: error: template declaration of ‘const _Tp& max’
/usr/include/c++/4.6/bits/stl_algobase.h:257:7: error: expected primary-expression before ‘if’
/usr/include/c++/4.6/bits/stl_algobase.h:257:7: error: expected ‘}’ before ‘if’
/usr/include/c++/4.6/bits/stl_algobase.h:259:7: error: expected unqualified-id before ‘return’

/usr/include/c++/4.6/bits/stl_algobase.h:260:5: error: expected declaration before ‘}’ token

花了很多时间都没有找到解决方法。终于在网上找到一点线索，然后一点一点试找到了一个workaround。其实这个错误与代码本身或g++版本无关，只是因为出现了宏定义冲突：

所以只需把属于自己定义的相关头文件（比如上面的LrwVUserVars.h）中加入（最好加在自己的头文件引用和标准头文件的引用之间）：

#include "LrwDomBase.h"
#include "LrwPostId.h"

//added by andy

#undef max
#undef min

#include <map>
#include <queue>

则这个问题就不会再出现了。