SelectionVariableNamesToFunctions.h

/**************************************************************************
 * basf2 (Belle II Analysis Software Framework)                           *
 * Author: The Belle II Collaboration                                     *
 *                                                                        *
 * See git log for contributors and copyright holders.                    *
 * This file is licensed under LGPL-3.0, see LICENSE.md.                  *
 **************************************************************************/
 
#pragma once
#include <string>
#include <unordered_map>
 
#include <tracking/trackFindingVXD/filterMap/filterFramework/Filter.h>
 
namespace Belle2 {
  template <
    class Variable,
    class Range,
    class ... Options
    >
  std::unordered_map<std::string, typename Variable::functionType>
  SelectionVariableNamesToFunctions(Belle2::Filter<Variable, Range, Options... >)
  {
    // Note: Variable::value is the pointer to the function that return the values
    return std::unordered_map< std::string, typename Variable::functionType>
    ({ {Variable::name(), Variable::value } });
  };
 
 
  template <
    class someFilter,
    class ...options >
  std::unordered_map<std::string, typename someFilter::functionType>
  SelectionVariableNamesToFunctions(Belle2::Filter<Belle2::OperatorNot,
                                    someFilter, options... >)
  {
    return SelectionVariableNamesToFunctions(someFilter());
  }
 
 
  template <
    class FilterA,
    class FilterB,
    class ...options
    >
  std::unordered_map<std::string, typename FilterA::functionType>
  SelectionVariableNamesToFunctions(Belle2::Filter<Belle2::OperatorAnd,
                                    FilterA, FilterB, options...>)
  {
    auto result = SelectionVariableNamesToFunctions(FilterA());
    auto resultB = SelectionVariableNamesToFunctions(FilterB());
    result.insert(resultB.begin(), resultB.end());
    return result;
  }
 
 
  template <
    class FilterA,
    class FilterB,
    class ...options
    >
  std::unordered_map<std::string, typename FilterA::functionType>
  SelectionVariableNamesToFunctions(Belle2::Filter<Belle2::OperatorOr,
                                    FilterA, FilterB, options...>)
  {
    auto result = SelectionVariableNamesToFunctions(FilterA());
    auto resultB = SelectionVariableNamesToFunctions(FilterB());
    result.insert(resultB.begin(), resultB.end());
    return result;
  }
}