Google NewsBot Humor

Sometimes I think that the Google bot that assembles the news page has a sense of humor when it chooses the image to show. I think this is an example.

Progress

Ecology, Art, and Technology | Environmental Risk Assessment Rover - AT Version 1.0: "Why has modernity, which was supposed to create a sense of security, produced more anxiety and threats than ever? Can scientific data and research help us understand the “riskiness” of contemporary life?"

Good question. I bet old Ned Ludd would have a theory on it.

Computer Jokes

Const-Correctness in C: "In C, you merely shoot yourself in the foot.

In C++, you accidentally create a dozen instances of yourself and shoot them all in the foot. Providing emergency medical care is impossible, because you can't tell which are bitwise copies and which are just pointing at others and saying, 'That's me, over there.'"

Haha.. I thought that was funny. I'm a nerd.

Generating N contiguous bits

So say you want to generate a bitmap that is N contiguous bits, without using some kind
of crazy inefficient for loop. Here's a way that I figured out how to do that (not to say I invented it or anything, but I couldn't find it when I searched for it).
Obviously this has compiler and machine dependencies, and probably doesn't work on the Ides of March, so use at your own risk.

In this example, I want to generate 6 bits of 1's (so 0b111111):

#include <stdio.h>
main(){
unsigned short a;
short b;
int n = 6;
b = 1 << n;
a = (unsigned short) -b; // extend the left bits
printf("a is %hx\n", a);
printf("~a is %hx\n", ~a);
a = ~a; // now b should be 0b111111
}


That's probably like 4 or 5 operations, so for 6 bits it probably sucks. But if you use 64 bit long longs and want to generate 47 one's then it will save some cycles.

Isn't playing with bits fun?

TigerDirect, UPS, and Hawaiian Shipping

I hate it when companies only use one shipping option. Because I live in Hawaii, certain shippers, such as UPS are absolutely outrageous because the only option is 2 day air. Unfortunately, many web businesses such as TigerDirect only ship via UPS, and this means that for a $50 RAM chip, shipping is $40. Clearly this really bites it.

Sometimes, a web business will hear our plight and agree to ship via the USPS or FedEx, both of which have much more reasonable shipping rates to Hawaii. Other times, as in the case of TigerDirect, they really don't give a shit about us out here in the middle of the Pacific. Wah.

I guess my ire should really be directed at UPS as well...

Dear Amoss,

That is indeed unfortunate for customers in Hawaii. I am sorry that
you do not value our business. I will be shopping at a competitor
with more reasonable shipping policies to Hawaii.

Thank you for your response.

Aloha,
David Donovan
- Hide quoted text -



On 10/24/07, TD Sales Leads wrote:
> Dear Valued Customer:
> We can only ship via UPS.
> Thank you for visiting our website. We at Tiger Direct appreciate your
> business. If you have further inquiries and reply to this email, please make
> sure to include your entire message, so we can address it appropriately.
>
> Sincerely,
> Amoss
> TigerDirect.com Web Response
>
>
> How are we doing? We would like to hear from you. Please give us your
> feedback at
> http://www.tigerdirect.com/sectors/custsurvey/service.asp .
>
>
>
> -----Original Message-----
> From: donovand@gmail.com (donovand@gmail.com)
> Sent: Oct 24, 2007 6:42:35 AM
> Subject: Pre-Sales Inquiries / Product Information
>
> **
> ** Message Sent from: TigerDirect.com website
> ** Please Respond with a tigerdirect.com email address.
> **
> Name : David Donovan
>
> E-Mail : donovand@gmail.com
>
> Phone : ()-
>
> Subject : Pre-Sales Inquiries / Product Information
>
> Message :
> I am interested in buying some memory from your company. Specifically, I am
> interested in a 1GB DDR RAM chip, which costs $51. Unfortunately, I live in
> Hawaii, and UPS ground is not an option for shipping, therefore the shipping
> costs for the item (which must be 2 day air) is approximately $40. I would
> really like to order from you, however the shipping is prohibitively
> expensive for me in Hawaii. Is it possible to ship via the US Post Office?
> This would be a much more reasonable option for me.
>
> Thank you for your attention to this matter.
>
> Sincerely,
> David Donovan
> http://questev.tigerdirect.net:7630/console/showSequence.do?sequenceid=28607304200710240607566420317232
>
>
>
>
>

Bit Twiddling

Okay, so I have this problem... I want to do something like:

if(a == 0){
a = b;
}

where a is a positive integer.

But without using an "if" (branching code really sucks). I found this crazy page and adopted it to my needs.

Here's my solution:

#include <stdio.h>

int main(){
unsigned int a = 0;
unsigned int test_msb = -a;
unsigned int mask = (unsigned int) (((int) test_msb)>>31);
unsigned int c = 2;

int result = (int) (a & mask)|(c & ~mask);
printf("%x %d\n", mask, result);
return 1;
}

If I change a to another positive integer, a is printed. When a is 0 (as is hardcoded above -- kids, don't try this at home), c (i.e., 2) is printed. Wee-hoo.

Linking to C++/CLI Static Libraries

So I had this weird problem where I was building a C++/CLI static library that included managed and unmanaged code. I had an unmanaged class that called static functions from a managed class (this is known as mixed mode) and was compiling the whole thing with /clr. When I was building another mixed mode .dll that called the mixed static library, I was getting linker errors to the functions in the static lib's managed classes. I found this on microsoft.public.dotnet.general newsgroup:


Hi all,

I have a .NET solution with several projects in it. One project is a "utilities" project that is compiled into a static library. It contains managed and unmanaged C++ in several files. So I am compiling using managed extensions. This project compiles successfully.

Another project in the solution, BrassControls, is dependent on the Utilities project. It uses several of the classes in Utilities. However, it fails at linking. I get the following error when building the BrassControls project [ -- the class BrassVersion is in the Utilities project]:

LINK : error LNK2020: unresolved token (06000050) Brass.BrassVersion::.ctor
LINK : error LNK2020: unresolved token (06000051) Brass.BrassVersion::.ctor
LINK : error LNK2020: unresolved token (06000052) Brass.BrassVersion::Finalize
LINK : error LNK2020: unresolved token (06000053) Brass.BrassVersion::ToString

These relate to the functions in the Brass::BrassVersion class. This is the only class in the Utilities project that is a __gc class.

I have verified that the project dependencies are set so that BrassControls is dependent on Utilities. But for some reason it can't "see" the tokens associated with BrassVersion.

Both projects are compiled using managed extensions. Both are using the same run-time library.

Can anyone help me figure this out?
Thanks,
Matt.


Ah-ha! This was exactly my problem. Unfortunately, the newsgroup didn't have an answer and it took me a few more hours to find it. The answer is easy... on the .dll that includes the static library, make sure the Linker option for the .dll "Use Dependency Inputs" is set to "Yes". I guess for unmanaged classes it would include them, but for managed classes it wouldn't, so I was getting a linker error (LNK2020) for unresolved tokens. It took me forever to figure this out and really pissed me off. I found the answer here.