[英]Erase element from std::list using a pointer?
class SororityBeerExpo{
public:
std::list<LaysCrankdPepChip> m_chipList;
void destroyChip(LaysCrankdPepChip * target)
{
// m_chipList needs to erase that which is pointed at by target but
// erase() requires an iterator which is not what we got to work with
// remove() needs a value which is not right either
}
}
My question, is how would one delete an element in a list, with a pointer that points to that element? 我的问题是,如何使用指向该元素的指针删除列表中的元素? I would like to do this without using Iterators in place of pointers.
我想这样做而不使用迭代器代替指针。
You can do a [linear] search for the element in the list, comparing the address of each element to your pointer ( std::find_if
will fit the bill). 您可以对列表中的元素进行[线性]搜索,将每个元素的地址与指针进行比较(
std::find_if
将符合条件)。 Of course, you will still be using an iterator in the end, because that's what list::erase
needs. 当然,最后你仍然会使用迭代器,因为这就是
list::erase
需要的东西。
You can't do it directly (although see Benjamin's answer for an indirect way of doing it). 你不能直接这样做(虽然看到本杰明的答案是间接的做法)。 A list node contains more data than just the object being contained (eg pointers to the previous and next nodes), but your raw pointer only points to the contained object.
列表节点包含的数据多于仅包含的对象(例如指向前一个节点和下一个节点的指针),但您的原始指针仅指向包含的对象。
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