Question

error C2593: 'operator =' is ambiguous 跪求高手指点，十分感激，！！

#include <iostream>
#include <string>
#include <vector>
#define NUM 100
using namespace std;
static int count=0;
typedef struct
{
string _name; //书名
string _type; //类型
string _publisher; //出版社
}Book;

class BookMgr
{
public:
BookMgr();
BookMgr(string name,string type,string publisher);
~BookMgr();
bool insertBooks(Book book); //录入书
bool deleteBooks(string name);//删除书
void show();//显示信息
// vector<Book> getInfoOfPublisherAndType(string& name,string type);
private:
Book *books[NUM];
};
BookMgr::BookMgr()
{
int i;
for (i=0;i<NUM;i++)
{
books[i]->_name=0;
books[i]->_type=0;
books[i]->_publisher=0;
}
}
BookMgr::BookMgr(string name,string type,string publisher)
{
int i=++count;
if(i<NUM)
{
books[i]->_name=name;
books[i]->_type=type;
books[i]->_publisher=publisher;
}

}

BookMgr::~BookMgr()
{
int i;
for (i=0;i<NUM;i++)
{
delete[] books[i];
}
}
bool BookMgr::insertBooks(Book book)
{
int i=++count;
if(i<NUM)
{
books[i]->_name=book._name;
books[i]->_type=book._type;
books[i]->_publisher=book._publisher;
return true;
}
return false;
}
bool BookMgr::deleteBooks(string name)
{
int i;
for (i=0;i<count;i++)
{
if(books[i]->_name==name)
{
delete[] books[i];
count--;
return true;
}
}
return false;
}
void BookMgr::show()
{
int i;
for (i=0;i<count;i++)
{
cout<<"书名："<<books[i]->_name<<"类型："<<books[i]->_type<<"出版社："<<books[i]->_publisher<<endl;
}

}
int main()
{
BookMgr b1,b2("程序设计","理科","清华大学");
b1=b2;
b1.show();
b2.show();
return 0;
}

Answer 1

原因：
Book *books[NUM];

BookMgr::BookMgr()
{
int i;
for (i=0;i<NUM;i++)
{
books[i]->_name=0; //这里books[i]未初始化，没有指向任何实实在在的结构体对象
books[i]->_type=0;
books[i]->_publisher=0;
}
}

请先用new申请到NUM个Book类型的空间，再让books指向它，然后再做清0处理