author | Claus Gittinger <cg@exept.de> |
Tue, 26 May 1998 17:11:57 +0200 | |
changeset 3487 | 565a1a49fbf9 |
parent 2957 | 46015145c398 |
child 3552 | 686923fc2096 |
permissions | -rw-r--r-- |
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1 |
" |
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2 |
COPYRIGHT (c) 1995 by Claus Gittinger |
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3 |
All Rights Reserved |
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4 |
|
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5 |
This software is furnished under a license and may be used |
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6 |
only in accordance with the terms of that license and with the |
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7 |
inclusion of the above copyright notice. This software may not |
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8 |
be provided or otherwise made available to, or used by, any |
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9 |
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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Object subclass:#ExternalAddress |
1267 | 14 |
instanceVariableNames:'address*' |
15 |
classVariableNames:'' |
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16 |
poolDictionaries:'' |
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category:'System-Support' |
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! |
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!ExternalAddress class methodsFor:'documentation'! |
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|
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copyright |
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" |
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24 |
COPYRIGHT (c) 1995 by Claus Gittinger |
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All Rights Reserved |
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|
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This software is furnished under a license and may be used |
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28 |
only in accordance with the terms of that license and with the |
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29 |
inclusion of the above copyright notice. This software may not |
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30 |
be provided or otherwise made available to, or used by, any |
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31 |
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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|
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documentation |
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" |
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Instances of this class represent external (non-Smalltalk) addresses. |
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They are only useful to represent handles as returned by C functions |
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as smalltalk objects. For example, Window- or WidgetIDs (which are actually |
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32 bit pointers) should be represented this way. |
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(you should not use SmallIntegers for this, since they can only represent 31 |
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bits; LargeIntegers could be used in theory, but it is not a very good style |
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to do so, since it makes things a bit cryptic - having ExternalAddresses |
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around makes things pretty clear in inspectors etc.). |
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There is not much you can do with ExternalAddresses on the smalltalk level; |
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creation/use is mostly in primitive C-code via |
1317 | 49 |
__MKEXTERNALADDRESS(voidPtr) and __ExternalAddressVal(obj). |
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ExternallAddresses are much like ExternalBytes - however, the latter |
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allow you to access bytes via indexed at:/at:put: messages. |
1960 | 53 |
ExternalAddresses do not allow such accesses (they are meant to remain |
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anonymous). |
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[author:] |
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57 |
Claus Gittinger |
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1317 | 58 |
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[see also:] |
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60 |
ByteArray |
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61 |
ExternalBytes ExternalFunction |
|
62 |
( how to write primitive code :html: programming/primitive.html ) |
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" |
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! |
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66 |
examples |
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" |
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68 |
To pass some C-pointer from primitive code to smalltalk: |
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|
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... |
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RETURN (__MKEXTERNALADDRESS(foo)); |
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pass it back to C and use it there: |
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|
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... |
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if (__isExternalAddress(anExternalAddress)) { |
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ptr = __externalAddressVal(anExternalAddress)); |
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} |
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... |
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|
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concrete example: |
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|
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test1 |
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%{ |
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static char foo[] = {'h', 'e' ,'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd', '\n'}; |
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RETURN (__MKEXTERNALADDRESS(foo)); |
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%} |
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test2:anExternalAddress |
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%{ |
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if (__isExternalAddress(anExternalAddress)) { |
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printf(__externalAddressVal(anExternalAddress)); |
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RETURN (self); |
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} |
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%} |
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" |
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! ! |
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!ExternalAddress class methodsFor:'queries'! |
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|
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isBuiltInClass |
1267 | 103 |
"return true if this class is known by the run-time-system. |
104 |
Here, true is returned." |
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|
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^ true |
1267 | 107 |
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"Modified: 23.4.1996 / 15:57:53 / cg" |
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! ! |
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|
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!ExternalAddress methodsFor:'accessing'! |
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|
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address |
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"return the start address as an integer" |
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|
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%{ /* NOCONTEXT */ |
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117 |
|
2869 | 118 |
unsigned INT addr; |
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|
2877 | 120 |
addr = (unsigned INT)__INST(address_); |
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RETURN ( __MKUINT(addr)); |
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122 |
%} |
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! ! |
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124 |
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!ExternalAddress methodsFor:'comparing'! |
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126 |
|
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= anExternalAddress |
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128 |
"return true, if two externalAddress instance represent the same |
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129 |
C pointer" |
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130 |
|
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131 |
%{ /* NOCONTEXT */ |
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132 |
if (__isExternalAddress(anExternalAddress) |
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&& (__externalAddressVal(self) == __externalAddressVal(anExternalAddress))) { |
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134 |
RETURN (true); |
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135 |
} |
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136 |
%}. |
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137 |
^ false |
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138 |
! |
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139 |
|
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140 |
hash |
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141 |
"return a number useful for hashing" |
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142 |
|
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143 |
%{ /* NOCONTEXT */ |
2869 | 144 |
unsigned INT addr = (unsigned INT) __externalAddressVal(self); |
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145 |
|
2472
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146 |
if (addr > _MAX_INT) { |
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147 |
if ((addr & 1) == 0) { |
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diff
changeset
|
148 |
addr >>= 1; |
00e7a1b3b07f
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1960
diff
changeset
|
149 |
} |
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1960
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changeset
|
150 |
if (addr > _MAX_INT) { |
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parents:
1960
diff
changeset
|
151 |
if ((addr & 1) == 0) { |
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parents:
1960
diff
changeset
|
152 |
addr >>= 1; |
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parents:
1960
diff
changeset
|
153 |
} |
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parents:
1960
diff
changeset
|
154 |
} |
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parents:
1960
diff
changeset
|
155 |
if (addr > _MAX_INT) { |
00e7a1b3b07f
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parents:
1960
diff
changeset
|
156 |
addr &= _MAX_INT; |
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parents:
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diff
changeset
|
157 |
} |
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parents:
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diff
changeset
|
158 |
} else { |
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parents:
1960
diff
changeset
|
159 |
addr <<= 1; |
00e7a1b3b07f
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parents:
1960
diff
changeset
|
160 |
if (addr <= _MAX_INT) { |
00e7a1b3b07f
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parents:
1960
diff
changeset
|
161 |
addr <<= 1; |
00e7a1b3b07f
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parents:
1960
diff
changeset
|
162 |
if (addr <= _MAX_INT) { |
00e7a1b3b07f
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parents:
1960
diff
changeset
|
163 |
addr <<= 1; |
00e7a1b3b07f
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parents:
1960
diff
changeset
|
164 |
} |
00e7a1b3b07f
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parents:
1960
diff
changeset
|
165 |
} |
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parents:
1960
diff
changeset
|
166 |
addr >>= 1; |
00e7a1b3b07f
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parents:
1960
diff
changeset
|
167 |
} |
00e7a1b3b07f
better distribution of the hash-key (look for zero-bits)
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parents:
1960
diff
changeset
|
168 |
RETURN (__MKSMALLINT(addr)); |
847
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changeset
|
169 |
%} |
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changeset
|
170 |
! ! |
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diff
changeset
|
171 |
|
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parents:
diff
changeset
|
172 |
!ExternalAddress methodsFor:'converting'! |
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changeset
|
173 |
|
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diff
changeset
|
174 |
asExternalBytes |
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diff
changeset
|
175 |
"return an ExternalBytes object pointing to where the receiver points to. |
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diff
changeset
|
176 |
Use of this is not recommended; primitives which return externalAddresses |
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diff
changeset
|
177 |
dont think that access to the memory is required/useful, while primitives |
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diff
changeset
|
178 |
which do think so should return an externalBytes instance right away." |
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diff
changeset
|
179 |
|
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changeset
|
180 |
^ ExternalBytes address:(self address) |
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diff
changeset
|
181 |
! ! |
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parents:
diff
changeset
|
182 |
|
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parents:
diff
changeset
|
183 |
!ExternalAddress methodsFor:'printing & storing'! |
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parents:
diff
changeset
|
184 |
|
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parents:
diff
changeset
|
185 |
displayString |
2957 | 186 |
"return a printed representation of the receiver for displaying" |
187 |
||
3487 | 188 |
^ self class name , ' at:' , (self address printStringRadix:16) |
2957 | 189 |
|
3487 | 190 |
"Modified: / 26.5.1998 / 16:11:50 / cg" |
847
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parents:
diff
changeset
|
191 |
! ! |
a79ec4e6670d
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Claus Gittinger <cg@exept.de>
parents:
diff
changeset
|
192 |
|
a79ec4e6670d
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parents:
diff
changeset
|
193 |
!ExternalAddress class methodsFor:'documentation'! |
a79ec4e6670d
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Claus Gittinger <cg@exept.de>
parents:
diff
changeset
|
194 |
|
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parents:
diff
changeset
|
195 |
version |
3487 | 196 |
^ '$Header: /cvs/stx/stx/libbasic/ExternalAddress.st,v 1.12 1998-05-26 15:11:57 cg Exp $' |
847
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Claus Gittinger <cg@exept.de>
parents:
diff
changeset
|
197 |
! ! |