Qt removeOne函数解析

如下，使用removeOne是否会导致空指针呢

#include<iostream>
#include "QVector"
#include "QDebug"

int main()
{

	QVector<int> a{ 1,2,3,5,6 };
	for (auto item : a)
	{
		a.removeOne(2);
	}

	for (auto item : a)
	{
		qDebug() << item;
	}

	std::cout <<"End" << std::endl;
	system("pause");
} 

答案是不会

在源码里找到原因如下

 bool removeOne(const T &t)
    {
        const int i = indexOf(t);
        if (i < 0)
            return false;
        remove(i);
        return true;
    }
    int QVector<T>::indexOf(const T &t, int from) const
{
    if (from < 0)
        from = qMax(from + d->size, 0);
    if (from < d->size) {
        T* n = d->begin() + from - 1;
        T* e = d->end();
        while (++n != e)
            if (*n == t)
                return n - d->begin();
    }
    return -1;
}