Mercurial > octave-nkf

annotate liboctave/oct-locbuf.h @ 8660:f274fbc29747

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
chunked buffer allocation for pointers
author Jaroslav Hajek <highegg@gmail.com>
date Wed, 04 Feb 2009 10:18:22 +0100
parents 7b6e1fc1cb90
children eb63fbe60fab
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
8377
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
1 /*
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
2
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
3 Copyright (C) 2008 Jaroslav Hajek <highegg@gmail.com>
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
4
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
5 This file is part of Octave.
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
6
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
7 Octave is free software; you can redistribute it and/or modify it
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
8 under the terms of the GNU General Public License as published by the
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
9 Free Software Foundation; either version 3 of the License, or (at your
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
10 option) any later version.
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
11
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
12 Octave is distributed in the hope that it will be useful, but WITHOUT
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
15 for more details.
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
16
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
17 You should have received a copy of the GNU General Public License
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
18 along with Octave; see the file COPYING. If not, see
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
19 <http://www.gnu.org/licenses/>.
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
20
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
21 */
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
22
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
23 #if !defined (octave_local_buffer_h)
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
24 #define octave_local_buffer_h 1
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
25
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
26 #include <cstddef>
8400
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
27 #include "oct-cmplx.h"
8377
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
28
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
29 // The default local buffer simply encapsulates an *array* pointer that gets
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
30 // delete[]d automatically. For common POD types, we provide specializations.
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
31
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
32 template <class T>
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
33 class octave_local_buffer
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
34 {
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
35 public:
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
36 octave_local_buffer (size_t size)
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
37 : data (0)
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
38 {
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
39 if (size)
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
40 data = new T[size];
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
41 }
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
42 ~octave_local_buffer (void) { delete [] data; }
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
43 operator T *() const { return data; }
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
44 private:
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
45 T *data;
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
46 };
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
47
8400
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
48 // For buffers of POD types, we'll be more smart. There is one thing that
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
49 // differentiates a local buffer from a dynamic array - the local buffers, if
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
50 // not manipulated improperly, have a FIFO semantics, meaning that if buffer B
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
51 // is allocated after buffer A, B *must* be deallocated before A. This is
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
52 // *guaranteed* if you use local buffer exclusively through the
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
53 // OCTAVE_LOCAL_BUFFER macro, because the C++ standard *mandates* explicit
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
54 // local objects be destroyed in reverse order of declaration.
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
55 // Therefore, we can avoid memory fragmentation by allocating fairly large
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
56 // chunks of memory and serving local buffers from them in a stack-like manner.
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
57 // The first returning buffer in previous chunk will be responsible for
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
58 // deallocating the chunk.
8377
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
59
8400
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
60 class octave_chunk_buffer
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
61 {
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
62 static const size_t chunk_size;
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
63
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
64 static char *top, *chunk;
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
65 static size_t left;
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
66
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
67 char *cnk;
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
68 char *dat;
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
69
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
70 public:
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
71
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
72 octave_chunk_buffer (size_t size);
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
73
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
74 ~octave_chunk_buffer (void);
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
75
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
76 char *data (void) const { return dat; }
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
77 };
8377
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
78
8400
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
79 // This specializes octave_local_buffer to use the chunked buffer mechanism
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
80 // for POD types.
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
81 #define SPECIALIZE_POD_BUFFER(TYPE) \
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
82 template <> \
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
83 class octave_local_buffer<TYPE> : private octave_chunk_buffer \
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
84 { \
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
85 public: \
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
86 octave_local_buffer (size_t size) : octave_chunk_buffer (size * sizeof (TYPE)) { } \
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
87 operator TYPE *() const { return reinterpret_cast<TYPE *> (this->data ()); } \
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
88 }
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
89
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
90 SPECIALIZE_POD_BUFFER (bool);
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
91 SPECIALIZE_POD_BUFFER (char);
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
92 SPECIALIZE_POD_BUFFER (unsigned short);
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
93 SPECIALIZE_POD_BUFFER (short);
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
94 SPECIALIZE_POD_BUFFER (int);
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
95 SPECIALIZE_POD_BUFFER (unsigned int);
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
96 SPECIALIZE_POD_BUFFER (long);
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
97 SPECIALIZE_POD_BUFFER (unsigned long);
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
98 SPECIALIZE_POD_BUFFER (float);
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
99 SPECIALIZE_POD_BUFFER (double);
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
100 // FIXME: Are these guaranteed to be POD and satisfy alignment?
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
101 SPECIALIZE_POD_BUFFER (Complex);
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
102 SPECIALIZE_POD_BUFFER (FloatComplex);
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
103 // MORE ?
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
104
8660
f274fbc29747 chunked buffer allocation for pointers
Jaroslav Hajek <highegg@gmail.com>
parents: 8400
diff changeset
105 // All pointers and const pointers are also POD types.
f274fbc29747 chunked buffer allocation for pointers
Jaroslav Hajek <highegg@gmail.com>
parents: 8400
diff changeset
106 template <class T>
f274fbc29747 chunked buffer allocation for pointers
Jaroslav Hajek <highegg@gmail.com>
parents: 8400
diff changeset
107 class octave_local_buffer<T *> : private octave_chunk_buffer
f274fbc29747 chunked buffer allocation for pointers
Jaroslav Hajek <highegg@gmail.com>
parents: 8400
diff changeset
108 {
f274fbc29747 chunked buffer allocation for pointers
Jaroslav Hajek <highegg@gmail.com>
parents: 8400
diff changeset
109 public:
f274fbc29747 chunked buffer allocation for pointers
Jaroslav Hajek <highegg@gmail.com>
parents: 8400
diff changeset
110 octave_local_buffer (size_t size) : octave_chunk_buffer (size * sizeof (T *)) { }
f274fbc29747 chunked buffer allocation for pointers
Jaroslav Hajek <highegg@gmail.com>
parents: 8400
diff changeset
111 operator T **() const { return reinterpret_cast<T **> (this->data ()); }
f274fbc29747 chunked buffer allocation for pointers
Jaroslav Hajek <highegg@gmail.com>
parents: 8400
diff changeset
112 };
f274fbc29747 chunked buffer allocation for pointers
Jaroslav Hajek <highegg@gmail.com>
parents: 8400
diff changeset
113
f274fbc29747 chunked buffer allocation for pointers
Jaroslav Hajek <highegg@gmail.com>
parents: 8400
diff changeset
114 template <class T>
f274fbc29747 chunked buffer allocation for pointers
Jaroslav Hajek <highegg@gmail.com>
parents: 8400
diff changeset
115 class octave_local_buffer<const T *> : private octave_chunk_buffer
f274fbc29747 chunked buffer allocation for pointers
Jaroslav Hajek <highegg@gmail.com>
parents: 8400
diff changeset
116 {
f274fbc29747 chunked buffer allocation for pointers
Jaroslav Hajek <highegg@gmail.com>
parents: 8400
diff changeset
117 public:
f274fbc29747 chunked buffer allocation for pointers
Jaroslav Hajek <highegg@gmail.com>
parents: 8400
diff changeset
118 octave_local_buffer (size_t size) : octave_chunk_buffer (size * sizeof (const T *)) { }
f274fbc29747 chunked buffer allocation for pointers
Jaroslav Hajek <highegg@gmail.com>
parents: 8400
diff changeset
119 operator const T **() const { return reinterpret_cast<const T **> (this->data ()); }
f274fbc29747 chunked buffer allocation for pointers
Jaroslav Hajek <highegg@gmail.com>
parents: 8400
diff changeset
120 };
f274fbc29747 chunked buffer allocation for pointers
Jaroslav Hajek <highegg@gmail.com>
parents: 8400
diff changeset
121
8400
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
122 // If the compiler supports dynamic stack arrays, we can use the attached hack
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
123 // to place small buffer arrays on the stack. It may be even faster than our
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
124 // obstack-like optimization, but is dangerous because stack is a very limited
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
125 // resource, so we disable it.
7b6e1fc1cb90 implement obstack-like optimization of local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8379
diff changeset
126 #if 0 //defined (HAVE_DYNAMIC_AUTO_ARRAYS)
8377
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
127
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
128 // Maximum buffer size (in bytes) to be placed on the stack.
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
129
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
130 #define OCTAVE_LOCAL_BUFFER_MAX_STACK_SIZE 8192
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
131
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
132 // If we have automatic arrays, we use an automatic array if the size is small
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
133 // enough. To avoid possibly evaluating `size' multiple times, we first cache
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
134 // it. Note that we always construct both the stack array and the
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
135 // octave_local_buffer object, but only one of them will be nonempty.
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
136
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
137 #define OCTAVE_LOCAL_BUFFER(T, buf, size) \
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
138 const size_t _bufsize_ ## buf = size; \
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
139 const bool _lbufaut_ ## buf = _bufsize_ ## buf * sizeof (T) \
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
140 <= OCTAVE_LOCAL_BUFFER_MAX_STACK_SIZE; \
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
141 T _bufaut_ ## buf [_lbufaut_ ## buf ? _bufsize_ ## buf : 0]; \
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
142 octave_local_buffer<T> _bufheap_ ## buf (!_lbufaut_ ## buf ? _bufsize_ ## buf : 0); \
8379
ad8ed668e0a4 allow initialized local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8377
diff changeset
143 T *buf = _lbufaut_ ## buf ? _bufaut_ ## buf : static_cast<T *> (_bufheap_ ## buf)
8377
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
144
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
145 #else
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
146
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
147 // If we don't have automatic arrays, we simply always use octave_local_buffer.
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
148
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
149 #define OCTAVE_LOCAL_BUFFER(T, buf, size) \
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
150 octave_local_buffer<T> _buffer_ ## buf (size); \
8379
ad8ed668e0a4 allow initialized local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8377
diff changeset
151 T *buf = _buffer_ ## buf
8377
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
152
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
153 #endif
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
154
8379
ad8ed668e0a4 allow initialized local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8377
diff changeset
155 // Yeah overloading macros would be nice.
ad8ed668e0a4 allow initialized local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8377
diff changeset
156 // Note: we use weird variables in the for loop to avoid warnings about
ad8ed668e0a4 allow initialized local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8377
diff changeset
157 // shadowed parameters.
ad8ed668e0a4 allow initialized local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8377
diff changeset
158 #define OCTAVE_LOCAL_BUFFER_INIT(T, buf, size, value) \
ad8ed668e0a4 allow initialized local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8377
diff changeset
159 OCTAVE_LOCAL_BUFFER(T, buf, size); \
ad8ed668e0a4 allow initialized local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8377
diff changeset
160 for (size_t _buf_iter = 0, _buf_size = size; \
ad8ed668e0a4 allow initialized local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8377
diff changeset
161 _buf_iter < _buf_size; _buf_iter++) buf[_buf_iter] = value
ad8ed668e0a4 allow initialized local buffers
Jaroslav Hajek <highegg@gmail.com>
parents: 8377
diff changeset
162
8377
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
163 #endif
25bc2d31e1bf improve OCTAVE_LOCAL_BUFFER
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
164