root/ROOT/RLazyDS.hxx

0001 // Author: Enrico Guiraud, Danilo Piparo CERN  02/2018
0002
0003 /*************************************************************************
0004  * Copyright (C) 1995-2018, Rene Brun and Fons Rademakers.               *
0005  * All rights reserved.                                                  *
0006  *                                                                       *
0007  * For the licensing terms see $ROOTSYS/LICENSE.                         *
0008  * For the list of contributors see $ROOTSYS/README/CREDITS.             *
0009  *************************************************************************/
0010
0011 #ifndef ROOT_RLAZYDS
0012 #define ROOT_RLAZYDS
0013
0014 #include "ROOT/RDF/RLazyDSImpl.hxx"
0015 #include "ROOT/RDataFrame.hxx"
0016
0017 #include <memory>
0018
0019 namespace ROOT {
0020
0021 namespace RDF {
0022
0023 // clang-format off
0024 ////////////////////////////////////////////////////////////////////////////////////////////////
0025 /// \brief Factory method to create a Lazy RDataFrame.
0026 /// \param[in] colNameProxyPairs the series of pairs to describe the columns of the data source, first element of the pair is the name of the column and the second is the RResultPtr to the column in the parent data frame.
0027 // clang-format on
0028 template <typename... ColumnTypes>
0029 RDataFrame MakeLazyDataFrame(std::pair<std::string, RResultPtr<std::vector<ColumnTypes>>> &&... colNameProxyPairs)
0030 {
0031    RDataFrame tdf(std::make_unique<RLazyDS<ColumnTypes...>>(
0032       std::forward<std::pair<std::string, RResultPtr<std::vector<ColumnTypes>>>>(colNameProxyPairs)...));
0033    return tdf;
0034 }
0035
0036 } // ns RDF
0037
0038 } // ns ROOT
0039
0040 #endif