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3_2_mylist-iter.h
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43 lines (34 loc) · 893 Bytes
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// file: 3mylist-iter.h
// #include "3_2_mylist.h"
template <class Item>
struct ListIter {
Item *ptr; // 保持与容器的联系
// default ctor
ListIter(Item* p =0) : ptr(p) {}
// 解引用 dereference
Item& operator*() const {
return *ptr;
}
// member access
Item* operator->() const {
return ptr;
}
// prefix increment, 返回对象
ListIter& operator++() {
ptr = ptr->next();
return *this;
}
// postfix increment, 返回值（新对象）
// int为占位符，提示编译器这是后自增
ListIter operator++(int) {
ListIter temp = *this;
++*this; // 调用前面的前自增
return temp;
}
bool operator==(const ListIter& i) const {
return ptr == i.ptr;
}
bool operator!=(const ListIter& i) const {
return ptr != i.ptr;
}
};