内存分配不当? [英] Improper de-allocation of memory?

问题描述

在测试我的代码时，由于类的测试平台始终指出，在使用new []分配的数组上调用delete时，始终会遇到有关使用delete的错误.我在〜IntVector中删除了两个扩展函数，其中Expand函数在为动态分配的数组重新分配内存的同时扩展容量.

如何正确使用Delete来防止内存泄漏并解决此错误?

主文件

  #include"IntVector.h"#include< iostream>#include< vector>使用命名空间std;IntVector ::〜IntVector(){delete []数据；}无效IntVector :: expand(){上限=上限* 2;int * data2 =数据；数据=新的int [cap];数据=数据2;删除数据2;delete [] data2;}IntVector :: expand(unsigned amount){上限=金额；int * data2 =数据；数据=新的int [cap];数据=数据2;删除数据2;delete [] data2;} 

标题

 <代码> #ifndef INTVECTOR_H#define INTVECTOR_H使用命名空间std;类IntVector {私人的:未签名的sz;未签名的上限；int *数据;私人的:void expand();void expand(unsigned amount);};#万一 

解决方案

使用 new [] 进行分配时，必须使用 delete [] .您的 expand 函数使用普通的 delete .它还包含一些其他错误(重新分配指针，重复删除等).

您的复制构造函数在哪里?复制分配运算符?您可能需要阅读三个规则.

When testing my code, I consistently get errors regarding the use of delete as my class's testbed states that delete is being called on an array allocated with new[]. I have delete in my ~IntVector and two expand functions with the expand functions expanding the capacity while reallocating memory for a dynamically allocated array.

How do I use delete correctly to prevent memory leaks and resolve this error?

main file

#include "IntVector.h"
#include <iostream>
#include <vector>
using namespace std;


IntVector::~IntVector(){
    delete[] data;
}

void IntVector::expand(){
    cap = cap * 2;
    int *data2 = data;
    data = new int[cap];
    data = data2;
    delete data2;
    delete[] data2;
}

void IntVector::expand(unsigned amount){
    cap = amount;
    int *data2 = data;
    data = new int[cap];
    data = data2;
    delete data2;
    delete[] data2;
}

header

#ifndef INTVECTOR_H
#define INTVECTOR_H

using namespace std;
class IntVector{
private:
    unsigned sz;
    unsigned cap;
    int *data;
private:
    void expand();
    void expand(unsigned amount);
};

#endif

解决方案

When allocating with new[] you have to use delete[]. Your expand function uses plain delete. It also contains some other errors (reassigning pointers, double deletion, etc.).

And where's your copy-constructor? Copy-assignment operator? You might want to read about the rule of three.

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