本文整理汇总了C++中TChain::SetCacheEntryRange方法的典型用法代码示例。如果您正苦于以下问题：C++ TChain::SetCacheEntryRange方法的具体用法？C++ TChain::SetCacheEntryRange怎么用？C++ TChain::SetCacheEntryRange使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类TChain的用法示例。
在下文中一共展示了TChain::SetCacheEntryRange方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: MuMcPrVKFV2012
//.........这里部分代码省略.........
if (p < 2) hists[h][p] = new TH2D(Name, Title, nMcRecMult, xMult.GetArray(), nMcRecMult, xMult.GetArray());
else if (p == 2) hists[h][p] = new TH1D(Name, Title, nMcRecMult, xMult.GetArray());
}
}
TNtuple *VertexG = new TNtuple("VertexG", "good vertex & global params info", vnames);
TNtuple *VertexB = new TNtuple("VertexB", "bad vertex & global params info", vnames);
// ----------------------------------------------
StMuDstMaker *maker = new StMuDstMaker(0, 0, "", file, "st:MuDst.root", 1e9); // set up maker in read mode
// 0,0 this mean read mode
// dir read all files in this directory
// file bla.lis real all file in this list, if (file!="") dir is ignored
// filter apply filter to filenames, multiple filters are separated by ':'
// 10 maximum number of file to read
maker->SetStatus("*", 0);
std::vector<std::string> activeBranchNames = {
"MuEvent",
"PrimaryVertices",
"StStMuMcVertex",
"StStMuMcTrack"
};
// Set Active braches
for (const auto& branchName : activeBranchNames)
maker->SetStatus(branchName.c_str(), 1);
TChain *tree = maker->chain();
Long64_t nentries = tree->GetEntries();
nevent = TMath::Min(nevent, nentries);
std::cout << nentries << " events in chain " << nevent << " will be read." << std::endl;
tree->SetCacheSize(-1); //by setting the read cache to -1 we set it to the AutoFlush value when writing
tree->SetCacheLearnEntries(1); //one entry is sufficient to learn
tree->SetCacheEntryRange(0, nevent);
for (Long64_t ev = 0; ev < nevent; ev++) {
if (maker->Make()) break;
StMuDst *muDst = maker->muDst(); // get a pointer to the StMuDst class, the class that points to all the data
StMuEvent *muEvent = muDst->event(); // get a pointer to the class holding event-wise information
int referenceMultiplicity = muEvent->refMult(); // get the reference multiplicity
TClonesArray *PrimaryVertices = muDst->primaryVertices();
int nPrimaryVertices = PrimaryVertices->GetEntriesFast();
TClonesArray *MuMcVertices = muDst->mcArray(0);
int nMuMcVertices = MuMcVertices->GetEntriesFast();
TClonesArray *MuMcTracks = muDst->mcArray(1);
int nMuMcTracks = MuMcTracks->GetEntriesFast();
if ( nevent >= 10 && ev % int(nevent*0.1) == 0 )
{
std::cout << "Event #" << ev << "\tRun\t" << muEvent->runId()
<< "\tId: " << muEvent->eventId()
<< " refMult= " << referenceMultiplicity
<< "\tPrimaryVertices " << nPrimaryVertices
<< "\t" << " " << nMuMcVertices
<< "\t" << " " << nMuMcTracks
<< std::endl;
}
// const Double_t field = muEvent->magneticField()*kilogauss;
if (! nMuMcVertices || ! nMuMcTracks || nPrimaryVertices <= 0) {
std::cout << "Ev. " << ev << " has no MC information ==> skip it" << std::endl;
std::cout << "OR no reconstructed verticies found" << std::endl;