bitmasks are data used for bitwise operations.
Questions tagged [bit-masks]
54 questions
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When the integers got upset
I have been stuck with this problem for quite large time.
https://www.hackerearth.com/code-monk-bit-manipulation/algorithm/when-the-integers-got-upset/. In short what is says is:
There are two arrays A and P of length N. There is a third array Z…
Walter
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2 answers
What should my constant mask value be for radix sort?
I was given a problem for one of my CS courses where I have to program a LSD radix sort that can sort unsigned integers (+ or -). It is given that the values to be sorted are 32-bit integer values.
The stipulation is that my mask must be a constant…
Erich Hauck
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Using bitmasks with iOS to send and receive data
I am working on a project where one of the requirements is to send and receive data using bitmasks. I have 12 bits (12 pieces of data) that I have to transmit the status of. I have an elementary understanding of bitmasks. Does anyone have a good…
Brian Kalski
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What is the maximum integer it is safe to use in a Javascript bitmask flag value?
This is mostly just a sanity-check.
Mozilla says that
The operands of all bitwise operators are converted to signed 32-bit
integers in two's complement format.
and that
The numbers -2147483648 and 2147483647 are the minimum and the maximum
…
Brian Rak
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Check that a bitmask flag is zero
I'm getting data from a server. The first bit indicates whether a message was read or not read: 1 for "read" and 0 for "not read". The second bit says whether the message was edited or not.
So I'm trying to read the statuses:
typedef…
Maria
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Setting bitmask enum declared in objective-c from swift
I'm trying to use Parse SDK for iOS in my new project. It has viewController with enum property;
typedef enum {
PFLogInFieldsNone = 0,
PFLogInFieldsUsernameAndPassword = 1 << 0,
PFLogInFieldsPasswordForgotten = 1 << 1,
…
Vitalii Boiarskyi
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iOS how to combine more than one option when writing NSData to file?
I have the following method of saving file data with more than one option. I want to combine NSDataWritingAtomic with NSDataWritingFileProtectionComplete. Should I use the | symbol to combine two options when writing NSData?
The reason why I'm…
Alex Stone
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5 answers
Best method to find out set bit positions in a bit mask in C
What would be the best way to identify all the set bit positions in a 64 bit bitmask. Suppose my bit mask is 0xDeadBeefDeadBeef, then what is the best way, to identify all the bit positions of the set bits in it.
long long bit_mask =…
Viks
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How to track multiple collisions between 2 sprites?
Here's an example, just for ease of understanding:
Sprite A is a ball. Sprite B is a cube. When the ball touches the cube once, I want the label to say first contact. When the same ball touches the same cube again, I want the label to say…
Neal
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