author | Claus Gittinger <cg@exept.de> |
Wed, 18 Mar 2020 10:11:21 +0100 | |
changeset 5468 | e9da15c1a36c |
parent 3878 | 8c30e6e6d334 |
permissions | -rw-r--r-- |
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" |
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COPYRIGHT (c) 1997 eXept Software AG |
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All Rights Reserved |
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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"{ Package: 'stx:libbasic2' }" |
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"{ NameSpace: Smalltalk }" |
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UnboxedIntegerArray variableSignedWordSubclass:#SignedWordArray |
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instanceVariableNames:'' |
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classVariableNames:'' |
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poolDictionaries:'' |
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category:'Collections-Arrayed' |
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! |
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!SignedWordArray class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1997 eXept Software AG |
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All Rights Reserved |
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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! |
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documentation |
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SignedWordArrays store 16bit signed integers in the range -16r8000..16r7FFF. |
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They are much like WordArrays, but the values stored are signed. |
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In contrast to normal arrays (which store pointers to their elements), |
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signedWordArrays store the values in a dense & compact way. |
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Since the representation fits the underlying C-language systems representation |
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of signed int16's, this is also useful to pass bulk data to c primitive code. |
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Therefore, SignedWordArrays can be used to hold bulk data in a more compact way. |
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For example: |
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Array new:100000 withAll:1 |
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requires 400k of object memory; |
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in contrast, |
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SignedWordArray new:100000 withAll:1 |
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only requires half of it. |
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[memory requirements:] |
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OBJ-HEADER + (size * 2) |
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[see also:] |
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ByteArray WordArray BooleanArray FloatArray DoubleArray Array |
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IntegerArray LongIntegerArray SignedLongIntegerArray |
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[author:] |
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Claus Gittinger |
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" |
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! ! |
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2642
e69731982fa9
faster elementByteSize query
Claus Gittinger <cg@exept.de>
parents:
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diff
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!SignedWordArray class methodsFor:'queries'! |
e69731982fa9
faster elementByteSize query
Claus Gittinger <cg@exept.de>
parents:
1177
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e69731982fa9
faster elementByteSize query
Claus Gittinger <cg@exept.de>
parents:
1177
diff
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elementByteSize |
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"for bit-like containers, return the number of bytes stored per element. |
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Here, 2 is returned" |
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e69731982fa9
faster elementByteSize query
Claus Gittinger <cg@exept.de>
parents:
1177
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^ 2 |
e69731982fa9
faster elementByteSize query
Claus Gittinger <cg@exept.de>
parents:
1177
diff
changeset
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e69731982fa9
faster elementByteSize query
Claus Gittinger <cg@exept.de>
parents:
1177
diff
changeset
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"Created: / 15-09-2011 / 14:11:18 / cg" |
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! |
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maxVal |
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"the maximum value which can be stored in instances of me. |
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For SignedWordArrays, this is 16r7FFF (largest 16bit signed int)" |
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^ 16r7FFF |
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! |
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minVal |
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"the minimum value which can be stored in instances of me. |
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For SignedWordArrays, this is -16r8000 (smallest 16bit signed int)" |
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^ -16r8000 |
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2642
e69731982fa9
faster elementByteSize query
Claus Gittinger <cg@exept.de>
parents:
1177
diff
changeset
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! ! |
e69731982fa9
faster elementByteSize query
Claus Gittinger <cg@exept.de>
parents:
1177
diff
changeset
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!SignedWordArray class methodsFor:'documentation'! |
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version |
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^ '$Header$' |
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! |
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version_CVS |
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^ '$Header$' |
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! ! |
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