无法在类的析构函数中删除指向数组的成员指针

Question

所以我试图删除我的成员指针m_memory，因为它指向char 的数组。当我尝试使用delete[] 删除 m_memory 指向的数组时，我最终触发了断点。在使用new 之前，我尝试将m_memory 初始化为nullptr，但它仍然触发了断点。只是想知道我的错误是什么。

头文件：

#ifndef FISH_H
#define FISH_H
#include <iostream>
class Fish {
public:
    Fish(int capacity, std::string name);// Constructor
    Fish(const Fish &other); // Copy Constructor
    ~Fish(); // Destructor
    Fish &operator=(const Fish &other); // Assignment Operator
    void remember(char c); // Remember c
    void forget(); // Clears memory by filling in '.'
    void printMemory() const;// Prints memory
    std::string getName();
protected:
    const char* getMemory() const;// Returns memory
    int getAmount() const; // Returns amount remembered
    int getCapacity() const; // Returns memory capacity
private:
    std::string m_name;
    char * m_memory;
    int m_capacity;
    int m_remembered;
int m_replace;

};
#endif

实现文件：

#include “fish.”

Fish::Fish(int capacity, std::string name) {// Constructor
    this->m_capacity = capacity;
    if (capacity > 0) {
        this->m_capacity = capacity;
    }
    else {
        this->m_capacity = 3;
    }

this->m_name = name;
this->m_memory = new char[this->m_capacity];
this->m_memory[this->m_capacity] = '\0';

for (int i = 0; i < this->m_capacity; i++) {
    this->m_memory[i] = '.';
    }
    this->m_remembered = 0;
    this->m_replace = 0;
}


Fish::~Fish() // Destructor
    {
        delete [] this->m_memory; //exception thrown, breakpoint triggered
    }

主要：

#include "fish.h"
int main() {
    Fish *nemo = new Fish(3, "nemo");
    nemo->~Fish();

}

Answer 1

this->m_memory = new char[this->m_capacity];
this->m_memory[this->m_capacity] = '\0';

这写在数组之外。 this->m_capacity 为 3，因此您分配 3 个字符，然后写入第 4 个字符。

计算机不需要检测此问题。 Microsoft 正试图通过检测它来提供帮助，但它们的检测仅在您释放内存时才会发生。如果您在调试器中运行程序，您应该会在“调试输出”窗口中看到一些消息，说明程序崩溃的原因。