[問題] 書上c++code的問題想請教
我在看The C++ Programming Language時
P436 上面的Vector 有些問題
template<class T> class Itor {
public:
virtual T* first() = 0;
virtual T* next() = 0;
};
template<class T> Vector_itor : public Itor<T> {
Vector<T> &v; // question 1, why using ref?? why not just Vector<T> v;
size_t index;
public
Vector_itor(Vector<T>&vv) : v(vv), index(0) { }
T* first() { return (v.size()) ? &v[index=0] : 0;}
// question 2, why reset index to 0?
T* next() { return (++index<v.size()) ? &v[index] : 0; }
};
以上2個問題不太了解 希望知道的人可以提示一下
謝謝
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