Namespace: Utility

namespace utility

Namespace used for common utility functions.

Functions

template<typename O, typename I>
inline std::pair<ROOT::RDF::RNode, std::string> Cast(ROOT::RDF::RNode df, const std::string &outputname, const std::string &outputtype, const std::string &column)

This function takes a column and casts it from type I to another type O.

Note

This functionality is mainly used to mitigate type changes between nanoAOD versions.

Template Parameters:

  • O – type of the output column

  • I – type of the input column

Parameters:

  • df – input dataframe

  • outputname – name of the output column containing the recasted column

  • outputtype – string with the type of the output column

  • column – name of the column that should be recasted to another type

Returns:

a new dataframe with the new column

inline bool ApproxEqual(double value1, double value2, double maxDelta = 1e-5)

Function to check if two double values are approximately equal.

Parameters:

  • value1 – first double value to compare

  • value2 – second double value to compare

  • maxDelta – maximum difference between the two values

Returns:

true or false

template<typename ...Args>
constexpr auto extractLastArgument(const std::tuple<Args...> &args)

This function extracts and returns the last element from a tuple containing a variable number of arguments. The function uses std::get to access the last element of the tuple, allowing you to retrieve the last argument without knowing its type or index beforehand.

Parameters:

args – input tuple containing the arguments

Returns:

last element of the tuple

template<typename ...Args>
constexpr auto popLastArgument(const std::tuple<Args...> &args)

This function extracts and returns all elements except the last one from a tuple containing a variable number of arguments. The function uses std::get to access the elements of the tuple, returning them as a vector of strings.

Parameters:

args – input tuple containing the arguments

Returns:

vector of strings with all elements except the last one

inline void appendParameterPackToVector(std::vector<std::string> &v, const std::string &parameter)

Function to append a parameter pack to a vector.

Parameters:

  • v – the vector to append to

  • parameter – string to append

template<typename ...ParameterPack>
inline void appendParameterPackToVector(std::vector<std::string> &v, const std::string &parameter, const ParameterPack&... pack)

Function to append a parameter pack to a vector.

Template Parameters:

ParameterPack –

Parameters:

  • v – the vector to append to

  • parameter – the string to append

  • pack – the parameter pack to append

template<typename ...Inputs>
inline ROOT::RDF::RNode EvaluateWorkspaceFunction(ROOT::RDF::RNode df, const std::string &outputname, const std::shared_ptr<RooFunctorThreadsafe> &function, const Inputs&... inputs)

Function to evaluate a RooWorkspace function and put the output into a new dataframe column.

Parameters:

  • df – input dataframe

  • outputname – name of the new column

  • function – a RooFunctor pointer, which has to be loaded from a Roo Workspace

  • inputs – a parameter pack containing all column names needed to be able to evaluate the workspace function

Returns:

a dataframe with the new column