std::map的删除

void eraseMap()
{
int n = sizeof(MmMethod);
std::map<CString, int>mapDemo;
for(int i = 0; i < 5; i++)
{
CString strKey;
strKey.Format(_T("key:%d"), i);
mapDemo.insert(std::make_pair(strKey, i));
}

for(auto it = mapDemo.begin(); it != mapDemo.end(); /*it++*/)
{
int n = it->second;
if(it->second == 2)
{
mapDemo.erase(it++);//或者it = mapDemo.erase(it);
}
else
{
it++;
}
}
}