C++:动态内存分配+向量

C++: Dynamic memory allocation + vector

本文关键字：向量分配内存动态 C++ 更新时间：2023-10-16

当我尝试将人员添加到向量时，它不起作用+我不能添加多个人员。我对C++还很陌生，我想不通。对不起我的英语：（谢谢你的帮助/提示。我一直在搜索它，尝试了很多事情，但无论如何都无法使它工作。我做错了什么，或者可能这个代码一团糟？

    class Osoba
    {
    public:
        char *name, *surname, *phone;                               
        Osoba();                                                                
        Osoba(const char *name, const char *surname, const char *phone);        
        ~Osoba();                                                               
    };
    inline Osoba::Osoba(){};
    inline Osoba::Osoba(const char *name, const char *surname, const char *phone)
    {
        Osoba::name = new char[strlen(name) + 10];                                          
        strcpy(Osoba::name, name);                                                          
        Osoba::surname = new char[strlen(surname) + 1];
        strcpy(Osoba::surname, surname);
        Osoba::phone = new char[strlen(phone) + 1];
        strcpy(Osoba::phone, phone);
    }

    inline Osoba::~Osoba()
    {
        delete name;
        delete surname;
        delete phone;
    }

    int main()
    {   
        const char *name2, *surname2, *phone2;
        vector <Osoba> osoba;
                cout << "n1.-Workers listn2.-Add personn3.-Quit";
                char odp;
                do
                {
                    odp = getch();
                    switch (odp)
                    {
                    case '1':
                        cout << "nnnList:n";
                        for (int i = 0; i < osoba.size(); i++)
                        {
                            cout << endl;
                            cout << "Name: " << osoba[i].name << endl;
                            cout << "Surname: " << osoba[i].surname << endl;
                            cout << "Phone: " << osoba[i].phone << endl;
                        }
                        break;
                    case '2':
                        cout << "nnADD PERSON";
                        cout << "nName: ";
                        string name;
                        cin >> name;
                        name2 = name.c_str();
                        cout << "Surname: ";
                        string surname;
                        cin >> surname;
                        surname2 = surname.c_str();
                        cout << "Phone: ";
                        string phone;
                        cin >> phone;
                        phone2 = phone.c_str();
                        osoba.push_back(Osoba(name2, surname2, phone2));
                        break;
                    }
                } while (odp != '3');
                return 0;
    }

既然你在做C++，为什么不用C++方式呢

#include <string>
using std::string;
class Osoba
{
public:                               
    Osoba() = default;                                                               
    Osoba(const string& name, const string& surname, const string& phone);
    Osoba(const Osoba&) = default;
    Osoba& operator=(const Osoba&) = default;
    ~Osoba() = default;         
    const string& Name()    const { return name;    }
    const string& Surname() const { return surname; }
    const string& Phone()   const { return phone;   }
    void Name(const string& n)    { name    =n; }
    void Surname(const string& s) { surname =s; }
    void Phone(const string& p)   { phone   =p; }
private:
    string name, surname, phone;                                          
};
Osoba::Osoba(const string& name, const string& surname, const string& phone)
    : name(name), surname(surname), phone(phone)
{
}

有几个问题：

定义复制构造函数如下：

Osoba::Osoba(const Osoba& src) {
  if (src.name != NULL) {
    name = new char[strlen(src.name) + 1];                                          
    strcpy(name, src.name);   
  }                                                       
  if (src.surname != NULL) {
    surname = new char[strlen(src.surname ) + 1];                                          
    strcpy(surname , src.surname );   
  }                                                       
  if (src.phone != NULL) {
    phone = new char[strlen(src.phone) + 1];                                          
    strcpy(phone, src.phone);   
  }                                                       
}

更改构造函数如下：

Osoba::Osoba(){
    name = (char *) NULL;
    surname = (char *) NULL;;
    phone = (char *) NULL;
  }                                   
};
Osoba::Osoba(const char *name, const char *surname, const char *phone)
{
  if (name != NULL) {
    this->name = new char[strlen(name) + 1];                                          
    strcpy(this->name, name);   
  }                                                       
  if (surname != NULL) {
    this->surname = new char[strlen(surname ) + 1];                                          
    strcpy(this->surname , surname );   
  }                                                       
  if (phone != NULL) {
    this->phone = new char[strlen(phone) + 1];                                          
    strcpy(this->phone, phone);   
  }
}

此外，分配操作员：

Osoba& Osoba::operatoe = (const Osoba& src) {
  if (this == &src)
    return *this;
  if (src.name != NULL) {
    name = new char[strlen(src.name) + 1];                                          
    strcpy(name, src.name);   
  }                                                       
  if (src.surname != NULL) {
    surname = new char[strlen(src.surname ) + 1];                                          
    strcpy(surname , src.surname );   
  }                                                       
  if (src.phone != NULL) {
    phone = new char[strlen(src.phone) + 1];                                          
    strcpy(phone, src.phone);   
  }
  return *this;                                         
}