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41 lines
699 B
C++
41 lines
699 B
C++
#pragma once
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#include <queue>
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#include "iterators/BaseIterator.h"
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template <typename T>
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class BFSIterator : public BaseIterator<T> {
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public:
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explicit BFSIterator(T* ptr) : BaseIterator<T>(ptr) {
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if (!this->current())
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return;
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for (auto& it : this->current()->children())
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q.push({it.get(), 1});
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}
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IIterator<T>& operator++() override {
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advance();
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return *this;
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}
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protected:
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std::queue<std::pair<T*, size_t>> q;
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void advance() {
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if (q.empty()) {
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this->set_current(nullptr);
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return;
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}
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auto& [node, lvl] = q.front();
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q.pop();
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this->set_current(node);
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this->set_level(lvl);
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for (auto& it : this->current()->children())
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q.push({it.get(), lvl + 1});
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}
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};
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