golang中怎么删除map中所有元素?

std::map<LONG,CBlinkPCHandle*>::iterator it;
for( it = m_mapUserLoginGUID.begin(); it != m_mapUserLoginGUID.end(); it ++)
{
if(it->second != NULL)
{
it->second->RemoveAll();
delete it->second;
}
m_mapUserLoginGUID.erase(it);
}
调用RemoveAll()删除所有元素