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From: eanv20@castle.ed.ac.uk (John Woods)
Newsgroups: comp.lang.c++
Subject: Please help me...
Keywords: Tracer, Help, Destruct
Message-ID: <7748@castle.ed.ac.uk>
Date: 10 Jan 91 11:10:38 GMT
Distribution: comp
Organization: Edinburgh University Computer Services
Lines: 53


	I would be very grateful for any help on the following.

"ARMtrace.h" contains the Tracer class from ARM 3.5 (p22). Objects
of this class are created with a string argument, which is echoed to the 
standard error in the form "... entered". On destruction of the object (when
it goes out of scope) the string is echoed once more, with the message "exit
from ...", providing a neat way to track the program. So, how does the
following output:

			main entered
				in main
			foo entered
				in foo, bar = 1
			exit from foo
				still in foo
				still in main
			exit from main
result from:

#include <stream.h>
#include "ARMtrace.h"

void foo( int bar ) {
	Tracer("foo");

	cerr << "\tin foo, bar = " << bar << "\n";
	if( bar ) ;
	cerr << "\tstill in foo\n";
}

main() {
	Tracer("main");

	cerr << "\tin main\n";
	foo(1);
	cerr << "\tstill in main\n";

	return 0;
}

	The interesting thing is that replacing if( bar ) with if( 1 ) or
if( 0 ) causes the output to be tthat expected.
	Sorry for the length and probable naivety of this posting, but I am 
at my wit's end. THadvanceNX...

				...John Woods


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