What |= operator means?

Question

1.00/5 (1 vote)

See more:

what this operator means(|=)
used in following sample code

C#

id |= static_cast<quint32>(static_cast<quint8>(data[0] & 0x1F) << 24)

please explain this line of code. if possible..

What I have tried:

I need to know about operator, which i never used before.

Posted 24-Jun-16 6:25am

XamBEE

Updated 24-Jun-16 6:59am

v2

Add a Solution

Comments

Richard MacCutchan 24-Jun-16 12:39pm

You could easily find the answer by reading your C++ reference.

3 solutions

Solution 2

Let's start on a more simple example, because properties do not always Support this syntax.

C++

byte theValue= 0;

theValue|= 0x01;

means the same as:

theValue= theValue | 0x01;

The remaining question is what does Operator "|" means:

It means bit whise "or" of the two arguments.
Now the question is what means "bit wise or":
0 or 0 is 0
0 or 1 is 1
1 or 0 is 1
1 or 1 is 1
You can maybe see in the table above, as soon as one of the arguments is "1" the result is "1".

Now, I assume you know a byte is 8 bits, in case not ask Google for more.

Arg1       : 0000 0000
Arg2       : 0000 0001
Arg1 | Arg2: 0000 0001

and so on
To dive more deep into this ask Google:
Bitwise operations in C - Wikipedia, the free encyclopedia[^]

Posted 24-Jun-16 6:44am

User 11060979

Updated 24-Jun-16 7:19am

v2

Solution 3

It is the same for every assignment operator. This

C++

id |= something;

means

C++

id = id | something;

C Operators[^] look at assignment operators

You should sharpen your knowledge of C/C++ basics
The C Programming Language - Wikipedia, the free encyclopedia[^]
https://hassanolity.files.wordpress.com/2013/11/the_c_programming_language_2.pdf[^]
http://www.ime.usp.br/~pf/Kernighan-Ritchie/C-Programming-Ebook.pdf[^]

Posted 24-Jun-16 6:59am

Patrice T

Updated 25-Jun-16 4:56am

v3

Comments

[no name] 25-Jun-16 10:37am

A 5. I assume the "4" was for some strange formatting issues ;)
Bruno

Patrice T 25-Jun-16 10:58am

Thank you.
I don't see a "4", but corrected some formatting issues.

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Dave Kreskowiak · Accepted Answer · 2016-06-24T06:36:00

Next time try Googling for the answer. This is an easy one. You just Google for "C++ |= operator". Start reading.

In this case, it's two operators in one. It's a bitwise OR operation combined with an assignment, like this:

C |= 2

is the same as

C = C | 2

In your example, the equivilent code would be:

frame2send.id = frame2send.id | (data[0] & 0xff) << 24;