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取消引用已初始化为 list.begin() 的迭代器时出现段错误。

list<data>::iterator it;
for(int i=0; i< n; i++)    
{
    it = (list_empty[i]).begin();
    while(it != (list_empty[i]).end())
    {
        cout<<"PROBLEM HERE: size="<<it->process.size<<endl;
        //cout<<"log file i="<<i<<endl;
        log_file_start(current_time, it,"list of empty");
        it++;
    }
}

这是来自 gdb 的错误：

Program received signal SIGSEGV, Segmentation fault.
[Switching to process 2888]
0x0804ecc0 in log_file_buddy (list_delay=..., list_vp=..., 
    list_empty=0x805a00c, method=..., current_time=0, n=10)
    at fuctions_of_mm.cpp:425 
425         cout<<"PROBLEM HERE: size="<<it->process.size << endl;

bt full 的 gdb 输出显示迭代器为 NULL。

(gdb) bt full
#0  0x0804ecc0 in log_file_buddy (list_delay=..., list_vp=..., 
    list_empty=0x805a00c, method=..., current_time=0, n=10)
    at fuctions_of_mm.cpp:425
        i = 8
        it = {_M_node = 0x0}
        out = <incomplete type>

尽管迭代器为 NULL，但仍会it != (list_empty[i]).end()计算 。怎么了？

编辑： 抱歉遗漏。就是这样：list_empty = new list<data>[n]; N是给定的参数，表示：2^{N} = Size_of_Memory

编辑#2： 这是定义：

typedef struct data{
    int position;
    vp proccess;
    int delay;
    int current_life;
    int time_start;
    int time_stop;
    int part_of_memory; 
    bool operator ==(const data& st)
    {
      return proccess.pid == st.proccess.pid;
    }
}data;

以及vp的定义：

    typedef struct {
    int size;
    int pid;//prosdiorisths diergasias
 }vp

以及 n: 的值n = 10。

list_empty 的声明是 list< data > *list_empty; .

4

2 回答 2

0

这对我有用：

#include <list>
using std::list;

const int n = 10;

typedef struct {
    int size;
    int pid;//prosdiorisths diergasias
}vp;


typedef struct data{
    int position;
    vp process;
    int delay;
    int current_life;
    int time_start;
    int time_stop;
    int part_of_memory;
    bool operator ==(const data& st)
    {
    return process.pid == st.process.pid;
    }
}data;

int main()
{

    list<data>* list_empty = new list<data>[n];
    list<data>::iterator it;
    for(int i=0; i< n; i++)
    {
        it = (list_empty[i]).begin();
        while(it != (list_empty[i]).end())
        {
            cout<<"PROBLEM HERE: size="<<it->process.size<<endl;
            //cout<<"log file i="<<i<<endl;
            //log_file_start(current_time, it,"list of empty");
            it++;
        }
    }
}
于 2013-01-24T18:57:34.770 回答
0

是什么it？

it_empty = new list<data>::iterator[n];
for(int i=0; i< n; i++)    
{
    auto it = (list_empty[i]).begin();
    while(it != (list_empty[i]).end())
    {
        cout<<"PROBLEM HERE: size="<<it->process.size<<endl;
        //cout<<"log file i="<<i<<endl;
        log_file_start(current_time, it,"list of empty");
        it++;
    }
}
于 2013-01-24T19:01:02.137 回答