从std :: multimap <>删除项目后,是否可以继续使用迭代器？

Question

即使在调用multimap :: erase()之后,我还能继续使用多重映射迭代器吗？例如:

Blah::iterator iter;
for ( iter = mm.begin();
      iter != mm.end();
      iter ++ )
{
    if ( iter->second == something )
    {
        mm.erase( iter );
    }
}

是否应该正确运行,或者在调用擦除后迭代器是否无效？像http://www.cplusplus.com/reference/stl/multimap/erase.html这样的参考站点在迭代器的生命周期主题或者建设性/破坏性方法对迭代器的影响方面都非常安静.

Answer 1

http://www.sgi.com/tech/stl/Multimap.html

Multimap has the important property that inserting a new element
into a multimap does not invalidate iterators that point to existing
elements. Erasing an element from a multimap also does not invalidate
any iterators, except, of course, for iterators that actually point to
the element that is being erased.

所以看起来应该是这样的:

Blah::iterator iter;
for ( iter = mm.begin();iter != mm.end();)
{
    if ( iter->second == something )
    {
        mm.erase( iter++ );
        // Use post increment. This increments the iterator but
        // returns a copy of the original iterator to be used by
        // the erase method
    }
    else
    {
        ++iter;   // Use Pre Increment for efficiency.
    }
}

另请参阅: 如果在从开始到结束迭代时调用map元素上的erase()会发生什么？

和

删除映射中的特定条目,但迭代器必须指向删除后的下一个元素