/[escript]/branches/schroedinger/escript/src/DataLazy.h
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Contents of /branches/schroedinger/escript/src/DataLazy.h

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Revision 1884 - (show annotations)
Tue Oct 14 04:54:59 2008 UTC (11 years, 7 months ago) by jfenwick
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File size: 2866 byte(s)
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Not crashing.

1
2 /*******************************************************
3 *
4 * Copyright (c) 2003-2008 by University of Queensland
5 * Earth Systems Science Computational Center (ESSCC)
6 * http://www.uq.edu.au/esscc
7 *
8 * Primary Business: Queensland, Australia
9 * Licensed under the Open Software License version 3.0
10 * http://www.opensource.org/licenses/osl-3.0.php
11 *
12 *******************************************************/
13
14
15 #if !defined escript_DataLazy_20081008_H
16 #define escript_DataLazy_20081008_H
17 #include "system_dep.h"
18
19 #include "DataAbstract.h"
20 //#include "DataTypes.h"
21 //#include "FunctionSpace.h"
22
23 #include <string>
24 #include <functional>
25
26 #include "LocalOps.h" // for tensor_binary_op
27
28 namespace escript {
29
30 enum ES_optype
31 {
32 UNKNOWNOP=0,
33 IDENTITY=1,
34 ADD=2,
35 SUB=3,
36 MUL=4,
37 DIV=5
38 };
39
40 const std::string&
41 opToString(ES_optype op);
42
43 /**
44 \class escript::DataLazy
45 \brief Wraps an expression tree of other DataObjects.
46 The values of DataPoints are computed when requested rather than all at once.
47
48 NOTE: This class assumes that the Data being pointed at are immutable.
49 */
50
51 class DataLazy;
52
53 typedef POINTER_WRAPPER_CLASS(DataLazy) DataLazy_ptr;
54 typedef POINTER_WRAPPER_CLASS(const DataLazy) const_DataLazy_ptr;
55
56 class DataLazy : public DataAbstract
57 {
58
59 typedef DataAbstract parent;
60 typedef DataTypes::ValueType ValueType;
61 typedef DataTypes::ShapeType ShapeType;
62
63 public:
64 ESCRIPT_DLL_API
65 DataLazy(DataAbstract_ptr p);
66
67 ESCRIPT_DLL_API
68 DataLazy(DataLazy_ptr left, DataLazy_ptr right, ES_optype op);
69
70 ESCRIPT_DLL_API
71 DataLazy(DataAbstract_ptr left, DataAbstract_ptr right, ES_optype op);
72
73 ESCRIPT_DLL_API
74 ~DataLazy();
75
76
77
78 /**
79 \brief Compute all data points in the expression tree
80 */
81 ESCRIPT_DLL_API
82 DataReady_ptr
83 resolve();
84
85 ESCRIPT_DLL_API
86 std::string
87 toString() const;
88
89 ESCRIPT_DLL_API
90 DataAbstract*
91 deepCopy();
92
93
94 /**
95 \brief
96 Return the number of doubles that would be stored for this Data object if it were resolved.
97 */
98 ESCRIPT_DLL_API
99 ValueType::size_type
100 getLength() const;
101
102
103 ESCRIPT_DLL_API
104 DataAbstract*
105 getSlice(const DataTypes::RegionType& region) const;
106
107
108 DataTypes::ValueType::size_type
109 getPointOffset(int sampleNo,
110 int dataPointNo) const;
111
112
113 // // this is a top level function, the actual searching will be done by helper methods
114 // ESCRIPT_DLL_API
115 // void
116 // getSample(ValueType& v, int sampleNo,size_t offset=0) const;
117
118 ESCRIPT_DLL_API
119 int
120 getBuffsRequired() const;
121
122 private:
123 DataReady_ptr m_id;
124 DataLazy_ptr m_left, m_right;
125 ES_optype m_op;
126 size_t m_length; // number of values represented by the operation
127
128 int m_buffsRequired; // how many buffers are required to evaluate this expression
129 size_t m_samplesize; // number of values required to store a sample
130
131 const double*
132 resolveSample(ValueType& v,int sampleNo, size_t offset ) const;
133
134 };
135
136 }
137 #endif

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