const stirng* 类型的指针cp，当cout<<*cp<<endl:会提示没有与之匹配的“<<”运算符

 #include<iostream>
 #include<cstring>
 #include<cstdio>
 #include<cstdlib>
 using namespace std;
 class StringStack{
     static const int size = ;
     const string* stack[size];
     int index;
 public:
     StringStack();
     void push(const string* s);
     const string* pop();

 };

 StringStack::StringStack() :index(){
     memset(stack, , size*sizeof(string*));
 }

 void StringStack::push(const string* s){
     if (index<size)
         stack[index++] = s;
 }

 const string* StringStack::pop(){
     if (index>){
         --index;
         const string* rv = stack[index];
         stack[index] = ;
         return rv;
     }

     return ;

 }

 string iceCream[] = {

     "pralines & cream", "fudege ripple", "jamocha almond fudge", "wild mountain blackberry",
     "raspberry sorbet", "lemon swirl", "rocky road", "deep chocolate fudge"

 };

 const int iCsz = sizeof(iceCream) / (sizeof(*iceCream));

 int main(){

     StringStack ss;
     for (int i = ; i<iCsz; i++)
         ss.push(&iceCream[i]);
     const string* cp;
     while ((cp = ss.pop()) != )
         cout << *cp << endl;//报错：
     system("pause");
     return ;

 }

2 IntelliSense: 没有与这些操作数匹配的 "<<" 运算符
操作数类型为: std::ostream << const std::string d:\programmer practice\thinking in c++\08\ConstInClass\ConstInClass\constInClass.cpp 61 8 ConstInClass