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annotate oldclasslib/README.txt @ 13:43d8b194fb4e

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Remove unused variables.
author David A. Holland
date Tue, 31 May 2022 00:59:00 -0400
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1 This is the "classlib" distributed with pre-open-source versions of
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2 AnaGram.
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3
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4 It is old and not very well designed. It is still here, and sort of
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5 being maintained, because (1) some of the examples use it, and (2)
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6 somebody out there might even be using it.
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7
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8 It should be considered deprecated. The examples will be migrated away
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9 from it over time; anyone using it in their own code should move to
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10 something else - whether AnaGram's own AGCLIB1 or the STL or whatever.
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11
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12 ------------------------------------------------------------
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13
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14 Changes to oldclasslib since the AG 2.01 release:
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15
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16 - Updated the syntax for friend template functions for the current (or
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17 at least recent) dialect of 'standard' C++.
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18
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19 - Added const qualifications in various places to allow use of string
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20 constants. In current C++ string constants have type "const char *";
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21 that was not the case when this code was written.
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22
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23 - Added explicit calls to base class constructors even when they take
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24 no arguments; gcc 3.3 whines if you don't have these.
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25
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26 - Removed the behavior where you can cast a stack<> to T* or a
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27 character_sink to char* to fetch the topmost element. Now you must
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28 call the top() method instead. Apparently the C++ standard says that
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29 having such a cast operator and also having operator[] is ambiguous,
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30 because you can convert the object to a pointer and apply [] to that
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31 as well as using the provided operator[] directly. This seems stupid
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32 bordering on insane, but when compilers start citing the standard at
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33 you there isn't much choice but to go along.
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34
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35 - Added explicit assignment operator definitions in places where gcc
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36 10.x now refuses to produce them automatically. Added missing "const"
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37 to some of the copy constructor arguments.