如何迭代STL集并有选择地删除元素？

Question

以下代码无法正常工作.该如何正确完成？

for (std::set<Color>::iterator i = myColorContainer.begin();
            i!=myColorContainer.end();
            ++i)
{
    if ( *i  == Yellow)
    {
        DoSomeProccessing( *i );
        myColorContainer.erase(i);
    }
}

Answer 1

尝试:

for(std::set<Color>::iterator it = myColorContainer.begin(); 
    it != myColorContainer.end();) { // note missing it++
     if( (*it) == Yellow ) {
        DoSomeProcessing(*it);
        myColorContainer.erase(it++); // post increment (original sent to erase)
     }
     else {
       ++it; // more efficient than it++;
     }
}

Answer 2

You don't need a loop as youre dealing with a set.

std::set<Color>::iterator it = myColorContainer.find(Yellow);
if (it != it.myColorContainer.end()){
  DoSomeProcessing(*it);
  myColorContainer.erase(it);
}