ArrayUtils(T* arr, int size) { this->arr = arr; this->size = size; }
时间: 2024-04-21 14:24:51 浏览: 15
这段代码是类模板 `ArrayUtils` 的构造函数,用于初始化成员变量 `arr` 和 `size`。构造函数的作用是接收传入的数组指针和大小,并将它们赋值给类的成员变量。
在这段代码中,`arr` 是一个指向类型 `T` 的数组的指针,`size` 是数组的大小。通过 `this->arr = arr;` 将传入的数组指针赋值给类的成员变量 `arr`,通过 `this->size = size;` 将传入的数组大小赋值给类的成员变量 `size`。
这样,在类的其他成员函数中就可以使用 `arr` 和 `size` 来操作数组了。
相关问题
#pragma once #include<iostream> using namespace std; template<class T> class MyArray { public: // 有参构造 MyAddress(int capacity) { this->m_Capacity = capacity; this->m_Size = 0; this->pAddress = new T[this->m_Capacity]; } // 析构函数 ~MyArray() { if (this->pAddress != NULL) { delete[]this->pAddress; this->MyAddress = NULL; } } // 拷贝构造 MyArray(const MyArray& arr) { this->m_Capacity = arr.m_Capacity; this->m_Size = arr.m_Size; /*this->pAddress = arr.pAddress;*/// 浅拷贝 this->pAddress = new T[arr.m_Capacity];// 深拷贝 // 将arr中的数据都拷贝过来 for (int i = 0; i < this->m_Size; i++) { this->pAddress[i] = arr.pAddress[i]; } } // operator= 防止浅拷贝问题 MyArray& operator=(const MyArray& arr) { // 判断原来堆区是否有数据,如果有先释放 if (this->pAddress != NULL) { delete[]this->pAddress; this->pAddress = NULL; this->m_Capacity = 0; this->m_Size = 0; } // 深拷贝 this->m_Capacity = arr.m_Capacity; this->m_Size = arr.m_Size; this->pAddress=new T[arr.m_Capacity] for (int i = 0; i < this->m_Size; i++) { this->pAddress[i] = arr.pAddress[i]; } return *this; } private: T* pAddress;// 指针指向堆区开辟的真实数组 int m_Capacity;// 数组容量 int m_Size;//数组大小 };上述代码有什么问题?
在上述代码中,`MyArray` 类中的构造函数被命名为 `MyAddress`,而不是 `MyArray`,这是一个拼写错误。
此外,在析构函数中,将 `this->MyAddress` 设置为 `NULL` 是错误的,应该是将 `this->pAddress` 设置为 `NULL` 来释放堆内存。
在赋值操作符重载函数中,没有为 `pAddress` 分配新的内存空间之前就进行了赋值操作,这会导致潜在的内存泄漏。应该先为 `pAddress` 分配新的内存空间,然后再进行赋值操作。
修正后的代码如下:
```cpp
#pragma once
#include<iostream>
using namespace std;
template<class T>
class MyArray {
public:
// 有参构造
MyArray(int capacity) {
this->m_Capacity = capacity;
this->m_Size = 0;
this->pAddress = new T[this->m_Capacity];
}
// 析构函数
~MyArray() {
if (this->pAddress != NULL) {
delete[] this->pAddress;
this->pAddress = NULL;
}
}
// 拷贝构造
MyArray(const MyArray& arr) {
this->m_Capacity = arr.m_Capacity;
this->m_Size = arr.m_Size;
this->pAddress = new T[arr.m_Capacity];
// 将arr中的数据都拷贝过来
for (int i = 0; i < this->m_Size; i++) {
this->pAddress[i] = arr.pAddress[i];
}
}
// operator= 防止浅拷贝问题
MyArray& operator=(const MyArray& arr) {
// 判断原来堆区是否有数据,如果有先释放
if (this->pAddress != NULL) {
delete[] this->pAddress;
this->pAddress = NULL;
this->m_Capacity = 0;
this->m_Size = 0;
}
// 深拷贝
this->m_Capacity = arr.m_Capacity;
this->m_Size = arr.m_Size;
this->pAddress = new T[arr.m_Capacity];
for (int i = 0; i < this->m_Size; i++) {
this->pAddress[i] = arr.pAddress[i];
}
return *this;
}
private:
T* pAddress; // 指针指向堆区开辟的真实数组
int m_Capacity; // 数组容量
int m_Size; // 数组大小
};
```
修正后的代码中,`MyArray` 类的构造函数被改回为 `MyArray`,修复了拼写错误。同时,在析构函数和赋值操作符重载函数中,修正了错误的内存释放和深拷贝实现。
帮我检查下这段代码哪里有问题:// #pragma once #include<iostream> using namespace std; template<class T> class Myarray { public: Myarray(int Capa) { cout << "M的有残调用" << endl; this->m_Capay = Capa; this->m_size = 0; this->pAdress = new T[this->m_Capay] } Myarray(const Myarray& arr) { cout << "M的拷贝调用" << endl; this->m_Capay = arr.m_Capay; this->m_size = arr.m_Capay; //this->pAdress = arr.pAdress; this->pAdress = new T[arr.m_Capay]; for (int i = 0; i < this->m_size; i++) { this->pAdress[i] = arr.pAdress[i]; } } Myarray& operator=(const Myarray& arr) { cout << "M的有operat用" << endl; if (this->pAdress != NULL) { delete[] this->pAdress; this->pAdress = NULL; this->m_Capay = 0; this->m_size = 0 } this->m_Capay = arr.m_Capay; this->m_size = arr.m_size; this->pAdress = new T[arr.m_Capay]; for (int i = 0; i < m_size; i++) { this->pAdress[i] = arr.pAdress[i]; } return *this; } ~Myarray() { if (this->pAdress != NULL) { cout << "M的西沟调用" << endl; delete[] this->pAdress; this->pAdress = NULL; } } private: T* pAdress; int m_Capay; int m_size; };
在第13行,构造函数的语句 `this->pAdress = new T[this->m_Capay]` 末尾缺少分号`;`,应该修改为:
```
this->pAdress = new T[this->m_Capay];
```
在第27行,赋值运算符的语句 `this->m_size = arr.m_Capay;` 应该修改为:
```
this->m_size = arr.m_size;
```
在第34行,赋值运算符的语句 `this->m_size = arr.m_size;` 应该修改为:
```
this->m_size = arr.m_size;
```
在第38行,析构函数的语句 `this->m_size = 0` 末尾缺少分号`;`,应该修改为:
```
this->m_size = 0;
```
修改后的代码如下:
```
#pragma once
#include<iostream>
using namespace std;
template<class T>
class Myarray {
public:
Myarray(int Capa) {
cout << "M的有残调用" << endl;
this->m_Capay = Capa;
this->m_size = 0;
this->pAdress = new T[this->m_Capay];
}
Myarray(const Myarray& arr) {
cout << "M的拷贝调用" << endl;
this->m_Capay = arr.m_Capay;
this->m_size = arr.m_size;
//this->pAdress = arr.pAdress;
this->pAdress = new T[arr.m_Capay];
for (int i = 0; i < this->m_size; i++)
{
this->pAdress[i] = arr.pAdress[i];
}
}
Myarray& operator=(const Myarray& arr) {
cout << "M的有operat用" << endl;
if (this->pAdress != NULL)
{
delete[] this->pAdress;
this->pAdress = NULL;
this->m_Capay = 0;
this->m_size = 0;
}
this->m_Capay = arr.m_Capay;
this->m_size = arr.m_size;
this->pAdress = new T[arr.m_Capay];
for (int i = 0; i < m_size; i++)
{
this->pAdress[i] = arr.pAdress[i];
}
return *this;
}
~Myarray() {
if (this->pAdress != NULL)
{
cout << "M的西沟调用" << endl;
delete[] this->pAdress;
this->pAdress = NULL;
}
}
private:
T* pAdress;
int m_Capay;
int m_size;
};
```