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 = 100;
    const string* stack[size];
    int index;
public:
    StringStack();
    void push(const string* s);
    const string* pop();

};

StringStack::StringStack() :index(0){
    memset(stack, 0, size*sizeof(string*));
}

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

const string* StringStack::pop(){
    if (index>0){
        --index;
        const string* rv = stack[index];
        stack[index] = 0;
        return rv;
    }

    return 0;

}

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 = 0; i<iCsz; i++)
        ss.push(&iceCream[i]);
    const string* cp;
    while ((cp = ss.pop()) != 0)
        cout << *cp << endl;//报错：
    system("pause");
    return 0;


}

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 hinking in c++8ConstInClassConstInClassconstInClass.cpp 61 8 ConstInClass