丢失的在VC9中编译VC6代码时在标识符之前

下面的代码在VC6中编译得很好,但是当我在VS2008中编译同一个项目时,它给出了以下错误 错误C2146:语法错误:缺少“;”在标识符“m_pItr”之前

template <class pKey, class Data, class pCompare, 
          class hKey = int, class hCompare = less<hKey>,
          class sKey = int, class sCompare = less<sKey>,
          class tKey = int, class tCompare = less<tKey>,
          class cKey = int, class cCompare = less<cKey>>

class  GCache
{
    private:

        typedef map<pKey, Data, pCompare> PRIMARY_MAP;
        PRIMARY_MAP pMap;

        PRIMARY_MAP::iterator m_pItr; //error here

//Code truncated
}

你知道这里出了什么问题吗?有人将C++代码从VC6迁移到VC2005/2008的经验可能会有所帮助。