Login or Register to Ask a Question and Join Our Community


Programming

Static variables in C++

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Programming Static variables in C++
# 8  
Old 12-07-2012
Quote:
Saying code like that "depend[s] on undefined behavior" is too kind. Anyone who writes code that assumes the location of a variable based on the location of another variable is bat-!*()% crazystupid.
It could be an exercise on exploring the details of how the compiler works, and a decent explanation on why undefined behavior is undefined; you ask for a variable and you get a variable, it's wholly up to the compiler what goes where.

The danger is that they will see this, decide "oh, that's how it works" and rely on this undefined behavior, when in reality they are depending on something that can be different everywhere.
Login or Register to Ask a Question

Previous Thread | Next Thread

9 More Discussions You Might Find Interesting

1. Programming

GDB problem accessing static variables in C

Hi, Can anyone explain this please..... This is on AIX with GDB (tried a few versions). It only happens when program compiled in 64 bit and only with static variables.... A simple test program... ### snip #include <stdio.h> main() { static int n; n = 6; printf("hello %d\n", n);... (0 Replies)
Discussion started by: bagpussnz
0 Replies

2. Programming

Even the Static cURL Library Isn't Static

I'm writing a program which uses curl to be run on Linux PCs which will be used by a number of different users. I cannot make the users all install curl on their individual machines, so I have tried to link curl in statically, rather than using libcurl.so. I downloaded the source and created a... (8 Replies)
Discussion started by: BrandonShw
8 Replies

3. Linux

Could static library include static library?

I have some static library(libxxx.a libyyy.a). And I want to generate my library(libzzz.a), libzzz.a will use libxxx.a and libyyy.a I wan't my application only use libzzz.a, (means libzzz.a had include libxxx.a, libyyy.a), how can I do that? Thank you. example: I have zzz.c. I do ... (4 Replies)
Discussion started by: freemagic
4 Replies

4. IP Networking

I need HELP to Set up Coyote Linux router with 1 static IP & 64 internal static IP

hello, i need help on setting my coyote linux, i've working on this for last 5 days, can't get it to work. I've been posting this message to coyote forum, and other linux forum, but haven't get any answer yet. Hope someone here can help me...... please see my attached picture first. ... (0 Replies)
Discussion started by: dlwoaud
0 Replies

5. Shell Programming and Scripting

How to static the average value

Hi all, Sorry I make a mistake,the title should be "How to statistic the average value " I do five times about "mv 123 to 456" and do five times about "mv 456 to 123" As we know,"time" can get the real usr sys value, I want to get the average real,usr,sys of "mv 123 to 456" and "mv 456 to... (4 Replies)
Discussion started by: yanglei_fage
4 Replies

6. Programming

How to convert byteArray variables to HexaString variables for Linux?

Hello everybody, I am having problem in converting byte array variables to Hexa String variables for Linux. I have done, converting byte array variables to Hexa String variables for Windows but same function doesn't work for linux. Is there any difference in OS ? The code for Windows is given... (2 Replies)
Discussion started by: ritesh_163
2 Replies

7. Programming

Static variables memory allocation

Hi I want to know when and where memory for static variables are allocated in a C program. If it allocates during compilation will memory be allocated for the variable "i" during compilation itself. int count(); int main(){ printf("%d", count()); return 0; } int count() { ... (8 Replies)
Discussion started by: nathanmca
8 Replies

8. Programming

Static

What does this command exactly do cc -static example.c (6 Replies)
Discussion started by: wojtyla
6 Replies

9. IP Networking

Static IP

Is it possible, and if so, how can I assign a static IP address to my RedHat 8.0 machine. I am using a Linksys router/switch with DHCP enabled. I have a small linux/windows2000 LAN at home. I want to assign a static IP so that I can setup port forwarding to my linux machine so that I can ssh into... (7 Replies)
Discussion started by: google
7 Replies
Login or Register to Ask a Question

LEARN ABOUT OPENSOLARIS

ppmtosixel

ppmtosixel(1)                                                 General Commands Manual                                                ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.  The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
              pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order  of  magni-
              tude larger than a compressed file and prints much slower.

       -margin
              If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
              fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater  than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

                                                                   26 April 1991                                                     ppmtosixel(1)