include/Geant4/G4MergeMode.hh

0001 //
0002 // ********************************************************************
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0025 //
0026
0027 // Author: Ivana Hrivnacova, 04/07/2012  (ivana@ipno.in2p3.fr)
0028
0029 #ifndef G4MergeMode_h
0030 #define G4MergeMode_h 1
0031
0032 #include "globals.hh"
0033 #include "G4Exception.hh"
0034
0035 #include <functional>
0036 #include <cmath>
0037
0038 // Enumeration for definition available binning schemes
0039
0040 enum class G4MergeMode {
0041   kAddition,        // "Or" if boolean type
0042   kMultiplication,  // "And" if boolean type
0043   kMaximum,         // "Or" if boolean type
0044   kMinimum          // "And" if boolean type
0045 };
0046
0047 // Generic merge function
0048 template <typename T>
0049 using G4MergeFunction = std::function<T(const T&, const T&)>;
0050
0051 // Utility functions
0052 namespace  G4Accumulables {
0053
0054 G4MergeMode GetMergeMode(const G4String& mergeModeName);
0055
0056 template <typename T>
0057 G4MergeFunction<T> GetMergeFunction(G4MergeMode mergeMode)
0058 {
0059   switch ( mergeMode ) {
0060     case G4MergeMode::kAddition:
0061       // return std::bind([](const T& x, const T& y) { return x + y; });
0062       return [](const T& x, const T& y) { return x + y; };
0063
0064     case G4MergeMode::kMultiplication:
0065       return [](const T& x, const T& y) { return x * y; };
0066
0067     case G4MergeMode::kMaximum:
0068       // return std::bind([](const T& x, const T& y) { return std::max(x,y);});
0069       return [](const T& x, const T& y) { return std::max(x,y); };
0070
0071     case G4MergeMode::kMinimum:
0072       // return std::bind([](const T& x, const T& y) { return std::min(x,y);});
0073       return [](const T& x, const T& y) { return std::min(x,y); };
0074   }
0075
0076   // Must never get here, but we need a return to satisfy MSVC
0077   G4Exception("G4Accumulables::GetMergeFunction<T>",
0078             "Analysis_F001", FatalException,
0079             "Undefined merge mode");
0080   return [](const T&, const T&) { return T(); };
0081 }
0082
0083 template <G4bool>
0084 G4MergeFunction<G4bool> GetMergeFunction(G4MergeMode mergeMode)
0085 {
0086   switch ( mergeMode ) {
0087     case G4MergeMode::kAddition:
0088     case G4MergeMode::kMaximum:
0089       // return std::bind([](const T& x, const T& y) { return x + y; });
0090       return [](const G4bool& x, const G4bool& y) { return x || y; };
0091
0092     case G4MergeMode::kMultiplication:
0093     case G4MergeMode::kMinimum:
0094       return [](const G4bool& x, const G4bool& y) { return x && y; };
0095   }
0096 }
0097
0098 }
0099
0100 #endif