c++ 数组模板类出现bug

2019-03-20 01:18:40 296 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

数据结构与算法学习1.1：数据结构之向量(C++语言实现) 学习书籍：数据结构(C++语言版) 邓俊辉环境：Win10 VS2017 注意事项： 1.模板类成员函数的声明和定义都放在头文件中。 2.头文件中尽可能不使用using namespace std;引入名称空间类似操作。代码会与邓俊辉老师的有略微不同之处，自己去写总会踩到一些C++语言的坑，同时当做C++的学习，代码都是检查过可运行的，可以直接使用，若存在BUG请及时指正错误。在定义数组的时... 阅读详情

#ifndef MyVextor_hpp__
#define MyVextor_hpp__

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>

using namespace std;

template <typename T>
class MyVector
{
friend ostream &operator<<<T>(ostream &os, MyVector &myvt);
public:
MyVector();
MyVector(T *array,int len);
virtual ~MyVector();

friend ostream &operator<<<T>(ostream &os, MyVector &myvt);
T &operator[](int index);
MyVector &operator=(MyVector &other);

int len;
T *myvp;

};

template <typename T>
MyVector<T>::MyVector(){

cout << "无参构造函数..." << endl;
}

template <typename T>
MyVector<T>::MyVector(T *array, int len){

// if (*array != nullptr)
// {
// return;
// }

this->len = len;
this->myvp = new T[len + 1];
memset(this->myvp, 0, this->len + 1);
memcpy(this->myvp,array,len*sizeof(T));

}

template <typename T>
MyVector<T>::~MyVector(){

if (this->myvp != nullptr)
{
delete[] this->myvp;
this->myvp = nullptr;
}

}

template <typename T>
ostream &operator<<(ostream &os, MyVector<T> &myvt){

for (int i = 0; i < myvt.len;i++)
{
os << myvt.myvp[i] << " ";
}
os << endl;

return os;
}

template <typename T>
T &MyVector<T>::operator[](int index){

if (index > this->len)
{
cout << "operator[] 重载error" << endl;
}
return this->myvp[index];

}

template <typename T>
MyVector<T> &MyVector<T>::operator=(MyVector<T> &other){

if (this->myvp != nullptr)
{
delete[] this->myvp;
this->myvp = nullptr;
}

this->len = other.len;
this->myvp = new T[len + 1];
memset(this->myvp, 0, this->len + 1);
memcpy(this->myvp, other.myvp, len);

return *this;
}

#endif // MyVextor_h__

上面是数组模板类

#include "MyVextor.hpp"

class Teacher
{
public:
Teacher();
Teacher(char *name,int age);
~Teacher();

friend ostream &operator<<(ostream &os,Teacher &other);

private:
char *name;
int age;

};

Teacher::Teacher()
{
}

Teacher::Teacher(char *name, int age){

this->age = age;

this->name = new char[10];
strcpy(this->name, name);

}

Teacher::~Teacher()
{
if (this->name != nullptr)
{
delete[] this->name;
this->name = nullptr;
}
}

ostream &operator<<(ostream &os, Teacher &other){

os << "Teacher " << other.name << "age " << other.age << endl;

return os;

}

int main(){

char car[] = { 'a', 'b', 'c' };
int iar[] = {1,2,3};
Teacher Tar[] = { Teacher("skskd",45),Teacher("tyty",69),Teacher("sdsdsfg",68)};

//MyVector<char> cp(car,sizeof(car)/sizeof(char));
//MyVector<int> ip(iar, sizeof(iar) / sizeof(int));
MyVector<Teacher> Tp(Tar, sizeof(Tar) / sizeof(Teacher));

//cout << cp[1] <<endl;
//cout << cp;
//cout << ip;
cout << Tp;
return 0;
}

运行是成功的，但是在析构时出现问题，直接就崩了

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