warning C4786 详解(VC++6.0)

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程序中在使用list的时候，如 std::list(#include <list>),std::vector,map的时候，有时候会出现下列类似Warning;

我的程序使用的是std::list：

1 Warning：

d:/program files/microsoft visual studio/vc98/include/list(176) : warning C4786: '?rbegin@?$list@PAUMODULE_DESC_V2300tag@@V?$allocator@PAUMODULE_DESC_V2300tag@@@std@@@std@@QAE?AV?$reverse_bidirectional_iterator@Viterator@?$list@PAUMODULE_DESC_V2300t
ag@@V?$allocator@PAUMODULE_DESC_V2300tag@@@std@@@std@@PAUMODULE_DESC_V2300tag@@AAPAU4@PAPAU4@H@2@XZ' : identifier was truncated to '255' characters in the browser information
        E:/XX.cpp(81) : see reference to class template instantiation 'std::list<struct MODULE_DESC_V2300tag *,class std::allocator<struct MODULE_DESC_V2300tag *> >' being compiled
d:/program files/microsoft visual studio/vc98/include/list(178) : warning C4786: '?rbegin@?$list@PAUMODULE_DESC_V2300tag@@V?$allocator@PAUMODULE_DESC_V2300tag@@@std@@@std@@QBE?AV?$reverse_bidirectional_iterator@Vconst_iterator@?$list@PAUMODULE_DESC_
V2300tag@@V?$allocator@PAUMODULE_DESC_V2300tag@@@std@@@std@@PAUMODULE_DESC_V2300tag@@ABQAU4@PBQAU4@H@2@XZ' : identifier was truncated to '255' characters in the browser information
        E:/XX.cpp(81) : see reference to class template instantiation 'std::list<struct MODULE_DESC_V2300tag *,class std::allocator<struct MODULE_DESC_V2300tag *> >' being compiled
d:/program files/microsoft visual studio/vc98/include/list(180) : warning C4786: '?rend@?$list@PAUMODULE_DESC_V2300tag@@V?$allocator@PAUMODULE_DESC_V2300tag@@@std@@@std@@QAE?AV?$reverse_bidirectional_iterator@Viterator@?$list@PAUMODULE_DESC_V2300tag
@@V?$allocator@PAUMODULE_DESC_V2300tag@@@std@@@std@@PAUMODULE_DESC_V2300tag@@AAPAU4@PAPAU4@H@2@XZ' : identifier was truncated to '255' characters in the browser information
        E:/XX.cpp(81) : see reference to class template instantiation 'std::list<struct MODULE_DESC_V2300tag *,class std::allocator<struct MODULE_DESC_V2300tag *> >' being compiled
d:/program files/microsoft visual studio/vc98/include/list(181) : warning C4786: '?rend@?$list@PAUMODULE_DESC_V2300tag@@V?$allocator@PAUMODULE_DESC_V2300tag@@@std@@@std@@QBE?AV?$reverse_bidirectional_iterator@Vconst_iterator@?$list@PAUMODULE_DESC_V2
300tag@@V?$allocator@PAUMODULE_DESC_V2300tag@@@std@@@std@@PAUMODULE_DESC_V2300tag@@ABQAU4@PBQAU4@H@2@XZ' : identifier was truncated to '255' characters in the browser information
        E:/XX.cpp(81) : see reference to class template instantiation 'std::list<struct MODULE_DESC_V2300tag *,class std::allocator<struct MODULE_DESC_V2300tag *> >' being compiled

2 原因：

此warning产生的原因是因为标识符过长，超过了最大限定255个字。类名超过了255个字，使用时就会报4786的waring。在使用STL（C++标准模板库）的时候经常引发类似的错误，尤其是list,vector，map这类模板类，模板中套模板，一不小心就超长了。

3 解决方法：

3.1直接定义别名：

#ifdef _DEBUG
#define TooLongClassNameA A
#define TooLongClassNameB B
#endif

3.2 屏蔽4786warning：

#pragma warning(disable : 4786)

屏蔽语句必须放在报错的模板类的引用声明（如#include <list>）之前，否则还是不起作用。