From: "Chris Croswhite" <ccroswhite@get2chip.com>
To: <gcc-help@gcc.gnu.org>
Subject: c++, gcc3.2.2 and bitwise operations
Date: Wed, 19 Feb 2003 01:36:00 -0000 [thread overview]
Message-ID: <43834.64.169.83.2.1045618399.squirrel@webmail01.get2chip.com> (raw)
How can I play with the guts of a variable one bit at a time in c++? That
is, I want to do something like this,
long long val =0x4000000000000001;
((int*)(&val)[1]) &= 0x0;
(this should set the first bit to zero). This worked with gcc 2.95.x, but I
understand now that the casting (&val)[1] (to an array) is "undefined" and
therefore not predictible.
Could anyone give me hand?
TIA,
Chris
next reply other threads:[~2003-02-19 1:36 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-19 1:36 Chris Croswhite [this message]
2003-02-19 11:56 ` Sebastian Huber
2003-02-19 12:25 ` Nathan Sidwell
2003-02-19 13:08 ` John Love-Jensen
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