wehub-resource-sync
71 lines
2.0 KiB
C++
71 lines
2.0 KiB
C++
// Copyright (c) 2023 CINN Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include <array>
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#include <functional>
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#include <queue>
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#include <unordered_set>
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namespace common {
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// breadth-first search visitor
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template <typename NodeType>
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class BfsWalker final {
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public:
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BfsWalker(const BfsWalker&) = delete;
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BfsWalker(BfsWalker&&) = delete;
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using NodeHandlerType = std::function<void(NodeType)>;
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using NodesVisitorType =
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std::function<void(NodeType, const NodeHandlerType&)>;
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BfsWalker(const NodesVisitorType& VisitNextNodes)
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: VisitNextNodes_(VisitNextNodes) {}
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void operator()(NodeType node, const NodeHandlerType& NodeHandler) const {
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std::array<NodeType, 1> nodes{node};
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(*this)(nodes.begin(), nodes.end(), NodeHandler);
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}
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template <typename NodeIt>
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void operator()(NodeIt begin,
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NodeIt end,
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const NodeHandlerType& NodeHandler) const {
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std::queue<NodeType> node_queue;
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std::unordered_set<NodeType> queued_nodes;
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const auto& TryEnqueueNode = [&](NodeType node) {
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if (queued_nodes.count(node) == 0) {
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node_queue.push(node);
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queued_nodes.insert(node);
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}
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};
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for (NodeIt iter = begin; iter != end; ++iter) {
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TryEnqueueNode(*iter);
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}
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while (!node_queue.empty()) {
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NodeType node = node_queue.front();
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node_queue.pop();
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NodeHandler(node);
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VisitNextNodes_(node, TryEnqueueNode);
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}
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}
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private:
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NodesVisitorType VisitNextNodes_;
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};
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} // namespace common
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