Newsgroups: comp.lang.c++
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From: scholes@spot.Colorado.EDU (Genuine Bud Man)
Subject: How do I call destructors on ^C in TC++?
Message-ID: <1991May24.045847.24401@colorado.edu>
Originator: scholes@spot.Colorado.EDU
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Organization: University of Colorado, Boulder
Date: Fri, 24 May 1991 04:58:47 GMT
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  Please excuse me if this is a FAQ, or if I am missing something
painfully obvious, but destructors don't seem to be called when
the user hits ^C in Turbo C++.
  I developed a class library for giving "sort of" virtual data
space.  The program requests X amount of mem, and the class tries
to satisfy the request first thru main memory, XMS, then disk space.
I have alloc, read, write, and free functions.  Each class instance
may only be manipulating one block of memory at a time, so multiple
class instances are running (at least in my stat app).  The problem
is that when the user types ^C, the destructors are not called, and
if the memory is in XMS or disk, then the XMS is not freed, or the
swap file not deleted.
  I could easily write a ^C handler, and intercept ^C, but how
would the handler know who to call, since the class instances are
auto vars of another function?  I could have the handler ignore ^C,
but I would like to have that functionality.
  I am new to C++, so there may be something staring me in the
face here, but I am lost as to what to do.  I guess the same basic
problem would exist in C, so how would it be handled?  Global
variables?                          Thanx in advance, Marty