void populateList(NodeList &nlist)
{
XmlRegexIO xmlRIO;
string filename = "ScanParams.xml";
string dataFilename = "ScanParamsData.xml";
XmlNode *paperSize = new PaperSize();
XmlNode *area = new Area();
XmlNode *patchCodeNotification = new PatchCodeNotification();
xmlRIO.setPattern("<element name=\"PaperSize\"\\s*>");
xmlRIO.getXmlTags(filename, *paperSize);
xmlRIO.setPattern("<[/]*PaperSize>");
xmlRIO.getXmlData(dataFilename, *paperSize);
xmlRIO.setPattern("<element name=\"Area\"\\s*>");
xmlRIO.getXmlTags(filename, *area);
xmlRIO.setPattern("<[/]*Area>");
xmlRIO.getXmlData(dataFilename, *area);
xmlRIO.setPattern("<element name=\"PatchCodeNotification\".*>");
xmlRIO.getXmlTags(filename, *patchCodeNotification);
xmlRIO.setPattern("<[/]*PatchCodeNotification>");
xmlRIO.getXmlData(dataFilename, *patchCodeNotification);
nlist.push_back(paperSize);
nlist.push_back(area);
nlist.push_back(patchCodeNotification);
}
NodeList InstBr::getTerminatorEdges() const {
NodeList OutEdges;
OutEdges.push_back(TargetFalse);
if (TargetTrue)
OutEdges.push_back(TargetTrue);
return OutEdges;
}
NodeList InstSwitch::getTerminatorEdges() const {
NodeList OutEdges;
OutEdges.push_back(LabelDefault);
for (SizeT I = 0; I < NumCases; ++I) {
OutEdges.push_back(Labels[I]);
}
return OutEdges;
}
// Evaluate an XPath expression and return matching Nodes.
NodeList Document::findXPath(const std::string& path) const
{
// Set up the XPath context
xmlXPathContextPtr context = xmlXPathNewContext(_xmlDoc);
if (context == NULL) {
std::cerr << "ERROR: xml::findPath() failed to create XPath context "
<< "when searching for " << path << std::endl;
throw XPathException("Failed to create XPath context");
}
// Evaluate the expression
const xmlChar* xpath = reinterpret_cast<const xmlChar*>(path.c_str());
xmlXPathObjectPtr result = xmlXPathEvalExpression(xpath, context);
xmlXPathFreeContext(context);
if (result == NULL) {
std::cerr << "ERROR: xml::findPath() failed to evaluate expression "
<< path << std::endl;
throw XPathException("Failed to evaluate XPath expression");
}
// Construct the return vector. This may be empty if the provided XPath
// expression does not identify any nodes.
NodeList retval;
xmlNodeSetPtr nodeset = result->nodesetval;
if (nodeset != NULL) {
for (int i = 0; i < nodeset->nodeNr; i++) {
retval.push_back(Node(nodeset->nodeTab[i]));
}
}
xmlXPathFreeObject(result);
return retval;
}
void SplitTree::rdsPrintPass( SplitPassInfo* inPass, std::ostream& inStream )
{
if( inPass == NULL )
return;
if( inPass->printVisited ) return;
inPass->printVisited = true;
for( SplitNodeSet::iterator j = inPass->descendents.begin(); j != inPass->descendents.end(); ++j )
rdsPrintPass( _dagOrderNodeList[*j]->_assignedPass, inStream );
// dumpFile << "PRINT PASS " << (void*)inPass << std::endl;
// for( NodeSet::iterator i = inPass->outputs.begin(); i != inPass->outputs.end(); ++i )
// {
// SplitNode* node = *i;
// dumpFile << "% ";
// node->dump( dumpFile );
// dumpFile << std::endl;
// }
NodeList outputs;
for( SplitNodeSet::iterator i = inPass->usefulOutputs.begin(); i != inPass->usefulOutputs.end(); ++i )
outputs.push_back( _dagOrderNodeList[ *i ] );
SplitShaderHeuristics unused;
_compiler.compile( *this, outputs, inStream, unused, true );
}
void ParallelBFS::calculate(NodeId root) {
distance.assign((size_t) vertex_count, infinity);
NodeId level = 1;
NodeList frontier;
frontier.reserve((size_t)vertex_count);
if (comm.rank() == find_owner(root)) {
frontier.push_back(root - first_vertex);
distance[root - first_vertex] = 0;
}
std::vector<NodeList> send_buf((size_t)comm.size());
NodeList new_frontier;
NodeList sizes((size_t)comm.size()),
displacements((size_t)comm.size());
while (mpi::all_reduce(comm, (NodeId)frontier.size(),
std::plus<NodeId>()) > 0) {
for (NodeId u : frontier)
for (int e = vertices[u]; e < vertices[u + 1]; ++e) {
int v = edges[e];
send_buf[find_owner(v)].push_back(v);
}
for (int i = 0; i < comm.size(); ++i) {
mpi::gather(comm, (NodeId)send_buf[i].size(), sizes.data(), i);
if (i == comm.rank()) {
for (int j = 1; j < comm.size(); ++j)
displacements[j] = displacements[j - 1] + sizes[j - 1];
new_frontier.resize(
(size_t)(displacements[comm.size()-1] + sizes[comm.size() - 1]));
mpi::gatherv(comm, send_buf[i], new_frontier, sizes, displacements, i);
} else {
mpi::gatherv(comm, send_buf[i], i);
}
}
for (size_t i = 0; i < comm.size(); ++i)
send_buf[i].clear();
frontier.clear();
for (int v : new_frontier) {
v -= first_vertex;
if (distance[v] == infinity) {
distance[v] = level;
frontier.push_back(v);
}
}
++level;
}
}
void sgNode::getInheritsNodes( NodeList &outlist, size_t count /*= 0*/, const StringHandleSet &classTypefilter /*= StringHandleSet()*/ )
{
outlist.clear();
if(count > 0)
outlist.reserve(count);
else
count = size_t(-1) - 1;
bool doFilter = true;
if(classTypefilter.empty())
doFilter = false;
size_t mycount = 0;
if(mycount == count)
return ;
sg_list(sgNode*) nodeQueue;
nodeQueue.push_back(this);
ChildNodeMap *childMap = &m_Children;
ChildNodeMap::const_iterator it = childMap->begin();
while(mycount < count && !nodeQueue.empty())
{
sgNode *node = nodeQueue.front();
nodeQueue.pop_front();
// do sth.
if(!doFilter)
{
outlist.push_back(node);
++mycount;
}
else if(classTypefilter.find(node->GetMyClassName()) != classTypefilter.end())
{
outlist.push_back(node);
++mycount;
}
childMap = &(node->m_Children);
it = childMap->begin();
for(; it!=childMap->end(); ++it)
{
nodeQueue.push_back(it->second);
}
}
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
////// Performs a breadth first search to find shortest available path (with non-saturated path capacities)
////// between a search node and a sink node. The function uses a search graph to perform the search and
////// store parent-child relationship of the nodes in the graph.
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
void PerformBFS(const Graph& graph,
SearchGraph& sgraph,
int source,
int sink,
Path* augpath)
{
NodeList nlist;
nlist.push_back(source);
int u, v;
int i;
SearchNode snode_u, snode_v;
bool found = false;
vector<int> nbr_nodes;
while (nlist.size() > 0)
{
u = nlist[0];
GetNeighboringNodes(u, graph, &nbr_nodes);
snode_u = sgraph[u];
for (i = 0; i < (int) nbr_nodes.size(); i++)
{
v = nbr_nodes[i];
snode_v = sgraph[v];
if (snode_v.color == -1)
{
snode_v.color = 0;
snode_v.dist = snode_u.dist + 1;
snode_v.parent = u;
sgraph[v] = snode_v;
nlist.push_back(v);
}
if (v == sink)
{
found = true;
break;
}
}
nlist.pop_front();
snode_u.color = 1;
sgraph[u] = snode_u;
if (found == true)
break;
}
if (found == true)
FindAugmentingPath(sgraph, source, sink, augpath);
}
// Read the Kaggle file into a vector of nodes
bool DataScaling::generateFirstLevel(ifstream& kaggleFile)
{
cout << "Level:0" << "\t";
// Set the maximum number of nodes per block, so a block can be processed in memory
int maxNodes = 1024 * 64; // must be a power of two
int maxNodesFlag = maxNodes - 1; // bit trick to avoid modulo later
// Get the nodeList for level 0
NodeList* nodeList = this->nodes[0];
// Process each line in the kaggle file
int block = 0;
stringstream ss;
string buffer;
string token;
while (getline(kaggleFile, buffer))
{
// C++ stuff so we can tokenize the line
ss.clear();
ss.str("");
ss << buffer;
// The node id is always the first token on the kaggle line
ss >> token;
int nodeId = atoi(token.c_str());
// Create a node object
Node* node = new Node(nodeId);
nodeList->push_back(node);
// Parse this node's word list
while (getline(ss, token, '|')) // kaggle file delimits words with a '|' character
{
int hashKeyOfWord = atoi(token.c_str());
node->addWord(hashKeyOfWord);
}
// We need to process the input in blocks, can't fit all the nodes in memory
// Check if we've read in a full block yet
// Bit AND'ing with maxNodesFlag is a trick to avoid expensive modulo
if ((nodeId > 0) && !(nodeId & maxNodesFlag))
{
cout << "Block:" << ++block << "\t";
this->nodeCount += nodeList->size();
}
}
// Process the last incomplete block
{
cout << "Block:" << ++block << "\t";
this->nodeCount += nodeList->size();
}
cout << "Level:1\tnodeCount:" << this->nodeCount << endl;
return(true);
}
void Pathfinder::PopulateListWithNodes(NodeList& toPopulate) {
for(int x = 0; x < m_currentLevel->GetWidth(); x++) {
for(int y = 0; y < m_currentLevel->GetHeight(); y++) {
if(m_nodeMap[x][y] && m_nodeMap[x][y]->IsOpen()) {
toPopulate.push_back(m_nodeMap[x][y]);
}
}
}
}
Node::NodeList Node::Children(const string & filterByName)
{
NodeList list;
for ( xmlNodePtr child = _xml->children; child != nullptr; child = child->next )
{
if ( filterByName.empty() || filterByName == child->name )
list.push_back(Wrapped<Node, _xmlNode>(child));
}
return list;
}
xml::NodeList xml::Node::getChildrenByName(const std::string& name) const
{
NodeList nodes;
for (xmlNodePtr child = node->children; child; child = child->next)
if (child->type == XML_ELEMENT_NODE && !strcmp((char*) child->name, name.c_str())) {
Node node(child);
nodes.push_back(node);
}
return nodes;
}
xml::NodeList xml::Node::getChildNodes() const
{
NodeList nodes;
for (xmlNodePtr child = node->children; child; child = child->next)
if (child->type == XML_ELEMENT_NODE) {
Node node(child);
nodes.push_back(node);
}
return nodes;
}
void findAll(const Path& path, const dom::NodePtr node, NodeList& result)
{
const detail::LocationStepList& steps = path.getStepList().steps;
detail::Context context(node.get());
result.clear();
detail::NodePtrVec temp;
findNodes(context,steps.begin(),steps.end(),temp,false);
for( detail::NodePtrVec::const_iterator it=temp.begin(); it!=temp.end(); ++it ) {
result.push_back( (*it)->self().lock() );
}
}
// Return a NodeList of all children of this node
NodeList Node::getChildren() const
{
NodeList retval;
// Iterate throught the list of children, adding each child node
// to the return list if it matches the requested name
for (xmlNodePtr child = _xmlNode->children; child != NULL; child = child->next) {
retval.push_back(child);
}
return retval;
}
void DescriptorHeapAllocator::AllocateHeap()
{
PtrDescHeap Heap;
ThrowIfFailed(m_Device->CreateDescriptorHeap(&m_Desc, IID_PPV_ARGS(Heap.GetAddressOf())));
D3D12_CPU_DESCRIPTOR_HANDLE HeapBase = Heap->GetCPUDescriptorHandleForHeapStart();
m_Heaps.reserve(m_Heaps.size() + 1);
NodeList freeList;
freeList.push_back({ HeapBase.ptr, HeapBase.ptr + m_Desc.NumDescriptors * m_DescriptorSize });
Entry entry = { Heap, freeList};
m_Heaps.push_back(entry);
m_FreeHeaps.push_back(m_Heaps.size() - 1);
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
////// Given a residual graph with no path from the source and sink node, the sunction outputs an assignment list
////// which assigns each node to either belonging to the source tree or the sink tree. It performs breadth first
////// search on the residual graph to find the children of the source tress. Any remaining nodes are aressigned
////// to the sink node.
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
void ComputeAssignments(const Graph& graph, int source, int sink, vector<int>* assignments)
{
SearchGraph sgraph;
assignments->clear();
const int nnodes = graph.size();
InitSearchGraph(&sgraph, nnodes, source);
assignments->resize(nnodes, -1);
NodeList nlist;
nlist.push_back(source);
int u, v;
int i;
SearchNode snode_u, snode_v;
bool found = false;
vector<int> nbr_nodes;
while (nlist.size() > 0)
{
u = nlist[0];
(*assignments)[u] = 1;
GetNeighboringNodes(u, graph, &nbr_nodes);
snode_u = sgraph[u];
for (i = 0; i < (int) nbr_nodes.size(); i++)
{
v = nbr_nodes[i];
snode_v = sgraph[v];
if (snode_v.color == -1)
{
snode_v.color = 0;
snode_v.dist = snode_u.dist + 1;
snode_v.parent = u;
sgraph[v] = snode_v;
nlist.push_back(v);
}
}
nlist.pop_front();
snode_u.color = 1;
sgraph[u] = snode_u;
}
}
// Generate a new level of nodes
bool DataScaling::generateNextLevel(int level)
{
cout << "Level:" << level << "\t";
// Get the number of nodes on the previous level
NodeList* previousNodeList = this->nodes[level - 1];
int previousSize = previousNodeList->size();
// Set the number of new nodes to generate
int numNewNodes = this->nodesPerLevel;
// Create new random nodes
NodeList* currentNodeList = this->nodes[level];
for (int count = 0; count < numNewNodes; ++count)
{
// Create a new node
int newId = this->nodeCount + count; // nodeCount is total number of nodes in all previous levels
Node* newNode = new Node(newId);
currentNodeList->push_back(newNode);
// Randomly select the degree for this node
int nodeDegree = (rand() % this->degree) + 1;
// For each degree (as specified on the command line)
for (int degree = 0; degree < nodeDegree; ++degree)
{
// Select a random node from the previous level
int oldId = rand() % previousSize;
// Check if there's already an edge to the selected node
if (!newNode->findEdge(oldId))
{
Node* oldNode = previousNodeList->at(oldId);
// Add an edge between the new node and the old node
newNode->addEdge(oldId);
oldNode->addEdge(newId);
this->edgeCount += 2;
// Randomly add some of the old node's words into the new node
int numWords = this->wordsPerNode / nodeDegree;
newNode->addPartialWordList(oldNode, numWords);
}
}
}
// Update the total number of nodes so far
this->nodeCount += numNewNodes;
cout << "nodeCount:" << this->nodeCount << endl;
return(true);
}
void InitializeNodes(string inFile)
{
nMap = new NodeMap();
ifstream iFile (inFile.c_str());
if (iFile.is_open())
{
string line;
while(getline(iFile, line))
{
istringstream iss(line);
string node1, node2, costString, relString;
getline(iss, node1, ',');
getline(iss, node2, ',');
getline(iss, costString, ',');
getline(iss, relString, ',');
Node* n12 = new Node(node2, atof(costString.c_str()), atof(relString.c_str()));
Node* n21 = new Node(node1, atof(costString.c_str()), atof(relString.c_str()));
if(nMap->find(node1) == nMap->end())
{
NodeList *nList = new NodeList();
nMap->insert(pair<string, NodeList*> (node1, nList));
}
NodeList *nList = nMap->find(node1)->second;
nList->push_back(n12);
if (nMap->find(node2) == nMap->end())
{
NodeList *nList = new NodeList();
nMap->insert(pair<string, NodeList*> (node2, nList));
}
nList = nMap->find(node2)->second;
nList->push_back(n21);
}
}
}
NodeList Node::getNamedChildren(const std::string& name) const
{
NodeList retval;
// Iterate throught the list of children, adding each child node
// to the return list if it matches the requested name
for (xmlNodePtr child = _xmlNode->children; child != NULL; child = child->next) {
if (xmlStrcmp(child->name, reinterpret_cast<const xmlChar*>(name.c_str())) == 0) {
retval.push_back(child);
}
}
return retval;
}
/**
* If a node with the same ID exists, update it.
* Otherwise add a new node.
* Assumes that remaining never changes for the same node id.
**/
inline void add(NodeId id, const Node * parent, float distance, float remaining) {
// Check if node is already in open list.
for(NodeList::iterator i = nodes.begin(); i != nodes.end(); ++i) {
if((*i)->getId() == id) {
if((*i)->getDistance() > distance) {
(*i)->newParent(parent, distance);
}
return;
}
}
nodes.push_back(new Node(id, parent, distance, remaining));
}
void HexagonOptAddrMode::getAllRealUses(NodeAddr<StmtNode *> SA,
NodeList &UNodeList) {
for (NodeAddr<DefNode *> DA : SA.Addr->members_if(DFG->IsDef, *DFG)) {
DEBUG(dbgs() << "\t\t[DefNode]: " << Print<NodeAddr<DefNode *>>(DA, *DFG)
<< "\n");
RegisterRef DR = DA.Addr->getRegRef();
auto UseSet = LV->getAllReachedUses(DR, DA);
for (auto UI : UseSet) {
NodeAddr<UseNode *> UA = DFG->addr<UseNode *>(UI);
NodeAddr<StmtNode *> TempIA = UA.Addr->getOwner(*DFG);
(void)TempIA;
DEBUG(dbgs() << "\t\t\t[Reached Use]: "
<< Print<NodeAddr<InstrNode *>>(TempIA, *DFG) << "\n");
if (UA.Addr->getFlags() & NodeAttrs::PhiRef) {
NodeAddr<PhiNode *> PA = UA.Addr->getOwner(*DFG);
NodeId id = PA.Id;
const Liveness::RefMap &phiUse = LV->getRealUses(id);
DEBUG(dbgs() << "\t\t\t\tphi real Uses"
<< Print<Liveness::RefMap>(phiUse, *DFG) << "\n");
if (phiUse.size() > 0) {
for (auto I : phiUse) {
if (DR != I.first)
continue;
auto phiUseSet = I.second;
for (auto phiUI : phiUseSet) {
NodeAddr<UseNode *> phiUA = DFG->addr<UseNode *>(phiUI);
UNodeList.push_back(phiUA);
}
}
}
} else
UNodeList.push_back(UA);
}
}
}
Node* osgDB::readNodeFiles(std::vector<std::string>& commandLine,const ReaderWriter::Options* options)
{
typedef std::vector<osg::Node*> NodeList;
NodeList nodeList;
// note currently doesn't delete the loaded file entries from the command line yet...
for(std::vector<std::string>::iterator itr=commandLine.begin();
itr!=commandLine.end();
++itr)
{
if ((*itr)[0]!='-')
{
// not an option so assume string is a filename.
osg::Node *node = osgDB::readNodeFile( *itr , options );
if( node != (osg::Node *)0L )
{
if (node->getName().empty()) node->setName( *itr );
nodeList.push_back(node);
}
}
}
if (nodeList.empty())
{
return NULL;
}
if (nodeList.size()==1)
{
return nodeList.front();
}
else // size >1
{
osg::Group* group = new osg::Group;
for(NodeList::iterator itr=nodeList.begin();
itr!=nodeList.end();
++itr)
{
group->addChild(*itr);
}
return group;
}
}
bool SplitTree::rdsCompile( const SplitNodeSet& inNodes, SplitShaderHeuristics& outHeuristics )
{
unsigned long startCompile = getTime();
NodeList nodes;
for( SplitNodeSet::iterator i = inNodes.begin(); i != inNodes.end(); ++i )
nodes.push_back( _dagOrderNodeList[ *i ] );
std::ostringstream nullStream;
_compiler.compile( *this, nodes, nullStream, outHeuristics );
unsigned long stopCompile = getTime();
timeCompilingCounter += stopCompile - startCompile;
return outHeuristics.valid;
}
bool PagedLOD::removeExpiredChildren(double expiryTime, unsigned int expiryFrame, NodeList& removedChildren)
{
if (_children.size()>_numChildrenThatCannotBeExpired)
{
unsigned cindex = _children.size() - 1;
if (!_perRangeDataList[cindex]._filename.empty() &&
_perRangeDataList[cindex]._timeStamp + _perRangeDataList[cindex]._minExpiryTime < expiryTime &&
_perRangeDataList[cindex]._frameNumber + _perRangeDataList[cindex]._minExpiryFrames < expiryFrame)
{
osg::Node* nodeToRemove = _children[cindex].get();
removedChildren.push_back(nodeToRemove);
return Group::removeChildren(cindex,1);
}
}
return false;
}
void SplitTree::exhaustiveSearch()
{
// first label the outputs
for( NodeList::iterator i = _outputList.begin(); i != _outputList.end(); ++i )
{
(*i)->_splitHere = true;
}
// now collect all the unlabeled, nontrivial nodes:
NodeList nodesToConsider;
for( NodeList::iterator j = _dagOrderNodeList.begin(); j != _dagOrderNodeList.end(); ++j )
{
if( (*j)->isMarkedAsSplit() ) continue;
if( !(*j)->canBeSaved() ) continue;
if( *j == _pseudoRoot ) continue;
nodesToConsider.push_back( *j );
}
size_t nodeCount = nodesToConsider.size();
int bestScore = INT_MAX;
for( size_t subsetSize = 0; subsetSize < nodeCount; subsetSize++ )
{
std::cout << "considering subsets of size " << subsetSize << " out of " << nodeCount << std::endl;
int bestScoreForSubsetSize = INT_MAX;
exhaustiveSubsetSearch( subsetSize, nodesToConsider, bestScoreForSubsetSize );
std::cout << "best split has score: " << bestScoreForSubsetSize << std::endl;
if( bestScoreForSubsetSize != INT_MAX )
{
if( (bestScore != INT_MAX) && (bestScoreForSubsetSize > bestScore) )
{
// there probably isn't a better partition, lets use this :)
break;
}
if( bestScoreForSubsetSize < bestScore )
bestScore = bestScoreForSubsetSize;
}
}
std::cout << "best overall score found before giving up: " << bestScore << std::endl;
}
DOMElement::NodeList DOMElement::getChildNodes() const
{
NodeList list;
if(!m_wrapped)
return list;
xercesc::DOMNodeList * xList = XELEM(m_wrapped)->getChildNodes();
for(XMLSize_t i = 0; i < xList->getLength(); i++) {
xercesc::DOMElement * xe = dynamic_cast<xercesc::DOMElement *> (xList->item(i));
if(!xe) continue;
list.push_back(DOMElement(ELEM(xe)));
}
return list;
}
virtual ReadResult readNode(std::istream& fin, const Options* options) const
{
loadWrappers();
fin.imbue(std::locale::classic());
Input fr;
fr.attach(&fin);
fr.setOptions(options);
typedef std::vector<osg::Node*> NodeList;
NodeList nodeList;
// load all nodes in file, placing them in a group.
while(!fr.eof())
{
Node *node = fr.readNode();
if (node) nodeList.push_back(node);
else fr.advanceOverCurrentFieldOrBlock();
}
if (nodeList.empty())
{
return ReadResult("No data loaded");
}
else if (nodeList.size()==1)
{
return nodeList.front();
}
else
{
Group* group = new Group;
group->setName("import group");
for(NodeList::iterator itr=nodeList.begin();
itr!=nodeList.end();
++itr)
{
group->addChild(*itr);
}
return group;
}
}
Node* osgDB::readNodeFiles(std::vector<std::string>& fileList,const Options* options)
{
typedef std::vector<osg::Node*> NodeList;
NodeList nodeList;
for(std::vector<std::string>::iterator itr=fileList.begin();
itr!=fileList.end();
++itr)
{
osg::Node *node = osgDB::readNodeFile( *itr , options );
if( node != (osg::Node *)0L )
{
if (node->getName().empty()) node->setName( *itr );
nodeList.push_back(node);
}
}
if (nodeList.empty())
{
return NULL;
}
if (nodeList.size()==1)
{
return nodeList.front();
}
else // size >1
{
osg::Group* group = new osg::Group;
for(NodeList::iterator itr=nodeList.begin();
itr!=nodeList.end();
++itr)
{
group->addChild(*itr);
}
return group;
}
}
bool IsMirror(Node *root)
{
typedef list<Node *> NodeList;
NodeList leftList;
NodeList rightList;
if (!root)
{
// an empty tree is mirrored
return true;
}
leftList.push_back(root->left);
rightList.push_back(root->right);
// BFS traversal.
// Pushing children to the lists and then comparing their values.
while (!leftList.empty() && !rightList.empty())
{
Node *left = leftList.front();
leftList.pop_front();
Node *right = rightList.front();
rightList.pop_front();
if (!left && !right)
{
continue;
}
else if (!left || !right)
{
return false;
}
if (left->value != right->value)
{
return false;
}
leftList.push_back(left->left);
leftList.push_back(left->right);
// the insert order is reversed in right sub-tree
rightList.push_back(right->right);
rightList.push_back(right->left);
}
// Both lists should be empty, otherwise this is not a mirrored binary tree.
return leftList.empty() && rightList.empty();
}