从向量 C++ 中擦除 class 元素

Question

I've faced a problem when I've tried to erase an element from the vector. Vector is filled with Class elements (class is called Node). So I've tried this:

int index = 2;
vector<Node> openNodesSet;
openNodesSet.erase(index);

But this is not working. I've found a solution:

int index = 2;
vector<Node> openNodesSet;
vector<Node>::iterator it = openNodesSet.begin();
advance(it, lowestIndex);
openNodesSet.erase(it);

Could somebody explane me why the first way is not working and the second one works without any problem? Is there any other ways to remove an element from the vector?

Answer 1

It's because erase takes an iterator as parameter, so if you want to work with your first try:

int index = 2;
vector<Node> openNodesSet;
openNodesSet.erase(openNodeSet.begin()+index);

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As the vector::erase() doc say:

iterator erase( iterator pos );
iterator erase( const_iterator pos );
Parameters
pos - iterator to the element to remove