Question

我遇到了问题。当我启动我的程序时，它运行良好，但是当它继续时，它表示存在断点错误。然后它说内存分配存在问题，因此无法正常工作。这是代码：部首：

#pragma once

#include <iostream>
#include <string>

class basics
{
private:
    char *str;
    int len;
    static int string_obj;
public:
    basics() { str = "ces", len = strlen(str), string_obj = 1; }
    basics(const basics &st);
    basics(const char *s);
    ~basics();
    friend std::ostream & operator<<(std::ostream &os, const basics &st);
};

班级职能：

#include "basics.h"
int basics::string_obj = 0;


basics::basics(const char *s)
{
    string_obj++;
    len = std::strlen(s);
    str = new char[len + 1];
    std::strcpy(str, s);
    std::cout << string_obj << " objects was created." << std::endl;
}

basics::basics(const basics & st)
{
    string_obj++;
    len = std::strlen(st.str);
    str = new char[len + 1];
    std::strcpy(str, st.str);
    std::cout << string_obj << " objects was created." << std::endl;
}

basics::~basics()
{
    std::cout << string_obj << " objects was created. Now we'll delete one      of them." << std::endl;
    --string_obj;
    std::cout << string_obj << " objects left." << std::endl;
    delete[] str;
}

std::ostream & operator<<(std::ostream &os, const basics &st)
{
    os << st.str;
    return os;
}

致电部分：

#include "basics.h"

int main()
{
    basics gigas("fear");
    basics cop(gigas);
    gigas.~basics();
    system("pause");
    return 0;
}

Answer 1

不要明确调用析构函数：

public void remove_all_frags(){
    android.support.v4.app.FragmentTransaction t = father.getSupportFragmentManager().beginTransaction();
    List<Fragment> all_frags = father.getSupportFragmentManager().getFragments();
    if (all_frags!=null && all_frags.size()>0){
        for (Fragment a_frag:all_frags) {
            if (a_frag!=null){
                Log.i("Dialog Dates","removing-- "+a_frag.getTag()+ " - class-- " + a_frag.getContext().getClass().toString());
                t.remove(a_frag);
            }
        }
        t.commit();
    }
}

当范围离开时，它将自动调用。因此出现崩溃，因为它实际上被调用了两次。

在对象上使用析构函数而不是包含char字符串时的断点异常

1 个答案: