| Geant4 Cross Reference |
1 // -*- C++ -*- << 1 // $Id:$
2 // << 2 // -*- C++ -*-
3 // ------------------------------------------- << 3 //
4 // Hep Random << 4 // -----------------------------------------------------------------------
5 // --- DoubConv --- << 5 // Hep Random
6 // class header file << 6 // --- DoubConv ---
7 // ------------------------------------------- << 7 // class header file
8 // << 8 // -----------------------------------------------------------------------
9 #ifndef DOUBCONV_HH << 9 //
10 #define DOUBCONV_HH << 10 #ifndef DOUBCONV_HH
11 << 11 #define DOUBCONV_HH
12 #include <string> << 12
13 #include <vector> << 13 #include <string>
14 #include <exception> << 14 #include <vector>
15 #include "CLHEP/Utility/thread_local.h" << 15 #include <exception>
16 << 16 #include "CLHEP/Utility/thread_local.h"
17 namespace CLHEP { << 17
18 << 18 namespace CLHEP {
19 class DoubConvException : public std::excepti << 19
20 public: << 20 class DoubConvException : public std::exception {
21 DoubConvException(const std::string & w) thr << 21 public:
22 ~DoubConvException() throw() {} << 22 DoubConvException(const std::string & w) throw() : msg(w) {}
23 const char* what() const throw() { return ms << 23 ~DoubConvException() throw() {}
24 private: << 24 const char* what() const throw() { return msg.c_str(); }
25 std::string msg; << 25 private:
26 }; << 26 std::string msg;
27 << 27 };
28 class DoubConv { << 28
29 public: << 29 class DoubConv {
30 << 30 public:
31 // dto2longs(d) returns (in a vector) two un << 31
32 // representation of its double input. This << 32 // dto2longs(d) returns (in a vector) two unsigned longs string containing the
33 // independant, and depends for complete por << 33 // representation of its double input. This is byte-ordering
34 // to the IEEE 754 standard for 64-bit float << 34 // independant, and depends for complete portability ONLY on adherance
35 // The first unsigned long contains the high << 35 // to the IEEE 754 standard for 64-bit floating point representation.
36 // 1.0 will always be 0x3FF00000, 00000000 << 36 // The first unsigned long contains the high-order bits in IEEE; thus
37 static std::vector<unsigned long> dto2longs( << 37 // 1.0 will always be 0x3FF00000, 00000000
38 << 38 static std::vector<unsigned long> dto2longs(double d);
39 // longs2double (v) returns a double contain << 39
40 // input, which must be a vector containing << 40 // longs2double (v) returns a double containing the value represented by its
41 // The input is taken to be the representati << 41 // input, which must be a vector containing 2 unsigned longs.
42 // the IEEE 754 standard for a 64-bit floati << 42 // The input is taken to be the representation according to
43 // is returned as a double. The byte-orderi << 43 // the IEEE 754 standard for a 64-bit floating point number, whose value
44 // of course, tailored to the proper byte-or << 44 // is returned as a double. The byte-ordering of the double result is,
45 static double longs2double (const std::vecto << 45 // of course, tailored to the proper byte-ordering for the system.
46 << 46 static double longs2double (const std::vector<unsigned long> & v);
47 // dtox(d) returns a 16-character string con << 47
48 // representation of its double input. This << 48 // dtox(d) returns a 16-character string containing the (zero-filled) hex
49 // independant, and depends for complete por << 49 // representation of its double input. This is byte-ordering
50 // to the IEEE 754 standard for 64-bit float << 50 // independant, and depends for complete portability ONLY on adherance
51 static std::string d2x(double d); << 51 // to the IEEE 754 standard for 64-bit floating point representation.
52 << 52 static std::string d2x(double d);
53 private: << 53
54 union DB8 { << 54 private:
55 unsigned char b[8]; << 55 union DB8 {
56 double d; << 56 unsigned char b[8];
57 }; << 57 double d;
58 static void fill_byte_order (); << 58 };
59 static CLHEP_THREAD_LOCAL bool byte_order_kn << 59 static void fill_byte_order ();
60 static CLHEP_THREAD_LOCAL int byte_order[8] << 60 static CLHEP_THREAD_LOCAL bool byte_order_known;
61 // Meaning of byte_order: The first (high << 61 static CLHEP_THREAD_LOCAL int byte_order[8];
62 // output (or the high-order byte of the f << 62 // Meaning of byte_order: The first (high-order in IEEE 754) byte to
63 // is of db.b[byte_order[0]]. Thus the i << 63 // output (or the high-order byte of the first unsigned long)
64 // is a position in the IEEE representatio << 64 // is of db.b[byte_order[0]]. Thus the index INTO byte_order
65 // of byte_order[k] is an offset in the me << 65 // is a position in the IEEE representation of the double, and the value
66 // double. << 66 // of byte_order[k] is an offset in the memory representation of the
67 }; << 67 // double.
68 << 68 };
69 << 69
70 } << 70
71 << 71 }
72 #endif // DOUBCONV_HH << 72
>> 73 #endif // DOUBCONV_HH
73 74