c++17(17)-异常try catch,operator[],vector at

0,精通Python,62.37==>1
1,精通C++,49.21==>1
1,精通C++,49.21==>1
访问索引超过范围Hit any key to continue...

#include <iostream>
#include <cstring>
#include <vector>
using namespace std;class Book
{private:int _id;char* _name;float _price;static inline int nowid{0};int _bookCount{1};
public : Book(int id, char* name, float price): _id(id), _price(price){int nameLen = strlen(name);_name = new char[nameLen + 1];strcpy(_name, name);}Book(char* name, float price):Book(nowid,name,price){nowid++;}~Book(){delete[] _name;}friend const Book& operator +(const Book& leftBook,const Book& rightBook){if (leftBook==rightBook) {Book *book=new Book(rightBook._name, rightBook._price); book->_bookCount=leftBook._bookCount+rightBook._bookCount;return *book;}else{return leftBook;}}friend const Book& operator -(const Book& leftBook,const Book& rightBook){if (leftBook==rightBook) {Book *book=new Book(rightBook._name, rightBook._price); book->_bookCount=leftBook._bookCount-rightBook._bookCount;if ( book->_bookCount<0) book->_bookCount=0;return *book;}else{return leftBook;}        }  Book& operator -=(const Book& otherBook){if (*this==otherBook) {_bookCount-=otherBook._bookCount;if ( _bookCount<0) _bookCount=0;return *this;}else{return *this;}        }      Book& operator +=(const Book& otherBook){if (*this==otherBook) {_bookCount+=otherBook._bookCount;return *this;}else{return *this;}        }    friend const bool operator ==(const Book& leftBook,const Book& rightBook){if (strcmp (rightBook._name,leftBook._name) == 0 && rightBook._price==leftBook._price) {return true;}else{return false;}        } friend  const bool operator !=(const Book& leftBook,const Book& rightBook){if (strcmp (rightBook._name,leftBook._name) == 0 && rightBook._price==leftBook._price) {return false;}else{return true;}        }    const void print() const{cout<<_id<<","<<_name<<","<<_price<<"==>"<< _bookCount<<endl;}void printCount(){cout<<_name<<":"<<_price<<"==>"<< _bookCount<<endl;       }
};
class BookS{private:vector<Book*> _myBooks;
public:void addBook(Book* book){_myBooks.push_back(book);   }void print() {for(const Book *bk:_myBooks){bk->print();}}Book& operator[](int i){      return *(_myBooks.at(i));}};int main(int argc, char **argv)
{Book *book1=new Book("精通Python",62.37);  Book *book2=new Book("精通C++",49.21);     BookS myBks;myBks.addBook(book1); myBks.addBook(book2); myBks.print();try{     myBks[1].print();myBks[2].print();  }catch(std::out_of_range e){cout<<"访问索引超过范围"<<endl;}}

下面对[]的重载，对vector使用.at的方式访问，这样可以抛出超范围异常，如果直接使用[]将导致超过范围

Book& operator[](int i){      return *(_myBooks.at(i));}

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c++17(17)-异常try catch,operator[],vector at

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