moleculardna/include/UtilityFunctions.hh

0001 //
0002 // ********************************************************************
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0025 //
0026 //
0027 #ifndef MOLECULAR_UTILITY_FUNCTIONS_HH
0028 #define MOLECULAR_UTILITY_FUNCTIONS_HH
0029
0030 #include "G4ThreeVector.hh"
0031 #include "globals.hh"
0032
0033 #include <array>
0034 #include <string>
0035 #include <vector>
0036
0037 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0038
0039 namespace utility
0040 {
0041 std::vector<G4String>& Split(const G4String&, char, std::vector<G4String>&);
0042
0043 std::vector<G4String> Split(const G4String&, char);
0044
0045 G4String Get_seperated_element(const G4String&, char, G4int);
0046
0047 std::array<G4String, 4> Get_four_elements(const G4String&, char);
0048
0049 G4bool Path_exists(const G4String&);
0050
0051 G4String Getcwd();
0052
0053 G4double Min(const G4ThreeVector&);
0054
0055 // sign function
0056 template<typename T>
0057 [[maybe_unused]] inline constexpr G4int Signum(T, std::false_type);
0058
0059 template<typename T>
0060 inline constexpr int Signum(T, std::true_type);
0061
0062 template<typename T>
0063 inline constexpr int Signum(T);
0064
0065 // find last (highest) significant bit
0066 // linux implementation, copied for portability
0067 // http://lxr.linux.no/#linux+v2.6.26.5/include/asm-generic/bitops/fls.h
0068 static inline int Fls(int x)
0069 {
0070   int r = 32;
0071
0072   if (!x) return 0;
0073   if (!(x & 0xffff0000u)) {
0074     x <<= 16;
0075     r -= 16;
0076   }
0077   if (!(x & 0xff000000u)) {
0078     x <<= 8;
0079     r -= 8;
0080   }
0081   if (!(x & 0xf0000000u)) {
0082     x <<= 4;
0083     r -= 4;
0084   }
0085   if (!(x & 0xc0000000u)) {
0086     x <<= 2;
0087     r -= 2;
0088   }
0089   if (!(x & 0x80000000u)) {
0090     x <<= 1;
0091     r -= 1;
0092   }
0093   return r;
0094 }
0095
0096 }  // namespace utility
0097
0098 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0099
0100 #endif  // MOLECULAR_UTILITY_FUNCTIONS_HH