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

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Revision 1886 - (show annotations)
Wed Oct 15 01:34:18 2008 UTC (11 years, 7 months ago) by jfenwick
File MIME type: text/plain
File size: 2983 byte(s)
Branch commit.
Added unary ops up to pos.
toString now prints expression.
Added inlines to UnaryFuncs.h.

Still only supporting DataExpanded.

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 SIN=6,
39 COS=7,
40 TAN=8,
41 ASIN=9,
42 ACOS=10,
43 ATAN=11,
44 SINH=12,
45 COSH=13,
46 TANH=14,
47 ERF=15,
48 ASINH=16,
49 ACOSH=17,
50 ATANH=18,
51 LOG10=19,
52 LOG=20,
53 SIGN=21,
54 ABS=22,
55 NEG=23,
56 POS=24
57 };
58
59 const std::string&
60 opToString(ES_optype op);
61
62 /**
63 \class escript::DataLazy
64 \brief Wraps an expression tree of other DataObjects.
65 The values of DataPoints are computed when requested rather than all at once.
66
67 NOTE: This class assumes that the Data being pointed at are immutable.
68 */
69
70 class DataLazy;
71
72 typedef POINTER_WRAPPER_CLASS(DataLazy) DataLazy_ptr;
73 typedef POINTER_WRAPPER_CLASS(const DataLazy) const_DataLazy_ptr;
74
75 class DataLazy : public DataAbstract
76 {
77
78 typedef DataAbstract parent;
79 typedef DataTypes::ValueType ValueType;
80 typedef DataTypes::ShapeType ShapeType;
81
82 public:
83 ESCRIPT_DLL_API
84 DataLazy(DataAbstract_ptr p);
85
86 ESCRIPT_DLL_API
87 DataLazy(DataAbstract_ptr left, ES_optype op);
88
89
90
91 ESCRIPT_DLL_API
92 DataLazy(DataLazy_ptr left, DataLazy_ptr right, ES_optype op);
93
94 ESCRIPT_DLL_API
95 DataLazy(DataAbstract_ptr left, DataAbstract_ptr right, ES_optype op);
96
97 ESCRIPT_DLL_API
98 ~DataLazy();
99
100
101
102 /**
103 \brief Compute all data points in the expression tree
104 */
105 ESCRIPT_DLL_API
106 DataReady_ptr
107 resolve();
108
109 ESCRIPT_DLL_API
110 std::string
111 toString() const;
112
113 ESCRIPT_DLL_API
114 DataAbstract*
115 deepCopy();
116
117
118 /**
119 \brief
120 Return the number of doubles that would be stored for this Data object if it were resolved.
121 */
122 ESCRIPT_DLL_API
123 ValueType::size_type
124 getLength() const;
125
126
127 ESCRIPT_DLL_API
128 DataAbstract*
129 getSlice(const DataTypes::RegionType& region) const;
130
131
132 DataTypes::ValueType::size_type
133 getPointOffset(int sampleNo,
134 int dataPointNo) const;
135
136
137 ESCRIPT_DLL_API
138 int
139 getBuffsRequired() const;
140
141 private:
142 DataReady_ptr m_id;
143 DataLazy_ptr m_left, m_right;
144 ES_optype m_op;
145 size_t m_length; // number of values represented by the operation
146
147 int m_buffsRequired; // how many buffers are required to evaluate this expression
148 size_t m_samplesize; // number of values required to store a sample
149
150 const double*
151 resolveSample(ValueType& v,int sampleNo, size_t offset ) const;
152
153 void
154 intoString(std::ostringstream& oss) const;
155
156 };
157
158 }
159 #endif

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