c++ - 错误 : assignment to '_List_iterator<unsigned int,unsigned int &,unsigned int *>' from 'int'

Question

我正在尝试实现一个将存储相关索引的列表。 但是，我在标题中提到的 for (index_itr = (list_size - numberOfEvents - 1) 处遇到错误。我在做什么错误，以及如何更正它？

void logPrintEntry(UINT32 index, UINT32 portID, UINT16 numberOfEvents)
{
    LOG_ENTRY log;
    list <UINT32> list_telnet_indices;
    log = (pLOG_ENTRY) &(Data.Log.log[index]);
    list <UINT32> ::iterator index_itr;
    UINT16 list_size = list_telnet_indices.size();
    if( list_size <= numberOfEvents )
    {
        // print all logs
        for ( index_itr = list_telnet_indices.begin();
            index_itr != list_telnet_indices.end(); ++index_itr )
        {
            printDataOnly(log, *index_itr, portID);
        }
    }
    else
    {
        // print only the last relevant entries
        for (index_itr = (list_size - numberOfEvents  - 1);     //error: assignment to '_List_iterator<unsigned int,unsigned int &,unsigned int *>' from 'int'
        index_itr != list_telnet_indices.end(); ++index_itr)
        {
            printDataOnly(log, *index_itr, portID);
        }
    }
}

Answer 1

index_itr 是一个迭代器，list_size - numberOfEvents - 1 是一个整数。这些不兼容。

使用std::advance设置 std::list

的迭代器

#include <iterator>     // std::advance

index_itr = list_telnet_indices.begin();
std::advance(index_itr, list_size - numberOfEvents - 1);
for (; index_itr != list_telnet_indices.end(); ++index_itr)
{
    ...
}