zero.H
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4  \\ / O peration |
5  \\ / A nd | Copyright (C) 2011-2016 OpenFOAM Foundation
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23 
24 Class
25  Foam::zero
26 
27 Description
28  A class representing the concept of 0 used to avoid unnecessary
29  manipulations for objects that are known to be zero at compile-time.
30 
31 SourceFiles
32  zeroI.H
33 
34 \*---------------------------------------------------------------------------*/
35 
36 #ifndef zero_H
37 #define zero_H
38 
39 #include "label.H"
40 
41 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
42 
43 namespace Foam
44 {
45 
46 /*---------------------------------------------------------------------------*\
47  Class zero Declaration
48 \*---------------------------------------------------------------------------*/
49 
50 class zero
51 {
52 public:
53 
54  typedef zero value_type;
55 
56  // Constructors
57 
58  //- Construct null
59  zero()
60  {}
61 
62 
63  // Member operators
64 
65  //- Return 0 for bool
66  inline operator bool() const
67  {
68  return 0;
69  }
70 
71  //- Return 0 for label
72  inline operator label() const
73  {
74  return 0;
75  }
76 
77  //- Return 0 for float
78  inline operator float() const
79  {
80  return 0;
81  }
82 
83  //- Return 0 for double
84  inline operator double() const
85  {
86  return 0;
87  }
88 };
89 
90 
91 // Global zero
92 static const zero Zero;
93 
94 
95 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
96 
97 } // End namespace Foam
98 
99 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
100 
101 #include "zeroI.H"
102 
103 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
104 
105 #endif
106 
107 // ************************************************************************* //
intWM_LABEL_SIZE_t label
A label is an int32_t or int64_t as specified by the pre-processor macro WM_LABEL_SIZE.
Definition: label.H:59
static const zero Zero
Definition: zero.H:91
zero value_type
Definition: zero.H:53
A class representing the concept of 0 used to avoid unnecessary manipulations for objects that are kn...
Definition: zero.H:49
zero()
Construct null.
Definition: zero.H:58
Namespace for OpenFOAM.