四维容器在.h文件内如何声明?//上面代码写在.cpp文件内可以编译过

        int Fourth;//=2
    int Third;//=2
    int Second;//=2
    int Firth;//=2
    vector<vector<vector<vector<CString> 
        > > > vec4(Fourth,vector<vector<vector<CString> 
            > >(Third,vector<vector<CString> 
                >(Second,vector<CString>(Firth))));