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iterator.cpp
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iterator.cpp
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#include <iostream>
#include <iterator>
#include <vector>
template<class T>
class AbstractIterator: public std::iterator<std::forward_iterator_tag, T> {
public:
virtual void next() = 0;
virtual void first() = 0;
virtual bool isDone() = 0;
virtual T &object() = 0;
virtual T &operator*() = 0;
inline T *operator->() { return &(operator*()); }
};
template<class T>
class Iterator: public AbstractIterator<T> {
public:
explicit Iterator(std::vector<T> data): data(std::move(data)), _index(0) {}
void next() override {
++_index;
}
void first() override {
_index = 0;
}
bool isDone() override {
return data.size() == 0 || _index == data.size() - 1;
}
T &object() override {
return data[_index];
}
T &operator*() override {
return this->object();
}
private:
std::vector<T> data;
size_t _index;
};
int main() {
std::vector<int> data = {1, 2, 4, 6, 7};
AbstractIterator<int> *iterator = new Iterator<int>(data);
iterator->next();
iterator->next();
std::cout << "Value: " << **iterator << std::endl;
delete iterator;
return 0;
}