bitset Questions
10
Solved
I am making a analytics system, the API call would provide a Unique User ID, but it's not in sequence and too sparse.
I need to give each Unique User ID an auto increment id to mark a analytics da...
Fumigant asked 5/12, 2011 at 10:38
6
Solved
For example, I have the integer
a = 10;
and it's binary representation (for a 32 bit integer) is
00000000000000000000000000001010
and reversed, it becomes
01010000000000000000000000000000
...
2
Solved
In c++. I initialize a bitset to -3 like:
std::bitset<32> mybit(-3);
Is there a grace way that convert mybit to -3. Beacause bitset object only have methods like to_ulong and to_string.
2
I'm working on something that requires me to get access to specific bits and ranges of bits. I decided to use bitset because it is easy to get access to specific bits; how can I extract a range (su...
Terraterrace asked 1/2, 2010 at 14:8
7
Solved
If I have an integer that I'd like to perform bit manipulation on, how can I load it into a java.util.BitSet? How can I convert it back to an int or long? I'm not so concerned about the size of the...
Ferri asked 18/3, 2010 at 21:56
3
Solved
I have a bitset which i am using to track whether an item is present or not example
b = 01100110000
it represents that 2nd and 3rd items are present and 1st and 4th item are not present.
While sear...
Residentiary asked 28/6, 2022 at 13:5
5
Solved
Is there a Python class or module that implements a structure that is similar to the BitSet?
3
Solved
I am looking for an efficient way how to easily convert a BitSet to a binary string. Let us say that its usual length would be thousands of bits.
For example, lets have this:
BitSet bits = new BitS...
9
Solved
What is the most optimized way to implement a < operator for std::bitset corresponding to the comparison of the unsigned integer representation (it should work for bitsets of more than 64 bits) ...
Ogive asked 20/1, 2014 at 22:6
6
I'm looking for a fast algorithm with gives me all the indexes of the set bits in a BitSet object.
This is slow:
BitSet bitSet = ...
Collection<Integer> indexes = new ArrayList<Integer&g...
7
Is there a way of iterating over a (possibly huge) std::bitset that is linear in the number of bits that are set to true? I want to prevent having to check every single position in the bitset. The ...
Terry asked 17/1, 2011 at 0:55
2
I have a very large string ( 64 characters) containing 1s and 0s.
sample - 1001111111101010011101101011100101001010111000101111011110001000
All I want is to convert it into BitSet var containing t...
7
Solved
How to write bitset data to a file?
The first answer doesn't answer the question correctly, since it takes 8 times more space than it should.
How would you do it ? I really need it to save a lot ...
7
Solved
I want to make a bitset in C++. I did a bit of research. All examples I found where like this:
bitset<6> myBitset;
// do something with it
But I don't know the size of the bitset when I de...
7
Solved
I'm looking for a good Java BitSet example to work with 0 and 1s. I tried looking at the Javadocs but I don't understand the usage of the class by just reading that. For instance, how would the and...
3
Solved
Working with JPA, I would like to be able to save a BitSet to the DB and pull it back of course.
Suppose I have:
@Entity
@Table(name = "myTable")
public class MyClass {
@Id
@GeneratedValue(str...
Samellasameness asked 12/9, 2012 at 14:7
4
Is it possible to use SSE instructions on the underlying data of a std::bitset? The bitsets I am working with are larger than unsigned long, so the to_ulong() method will not suffice. For instance,...
2
Solved
5
Solved
I searched around and could not find the performance time specifications for bitset::count(). Does anybody know what it is (O(n) or better) and where to find it?
EDIT By STL I refer only to the St...
Maculation asked 14/1, 2011 at 17:3
4
Solved
In my program I need to check if I have already generated a value in a set of 2.5*10^9. I expect to generate about the half of the set and need to have a fast way to check and update it. The bitset...
Tungstate asked 25/4, 2011 at 15:44
9
Solved
I'm working with java.
I have a byte array (8 bits in each position of the array) and what I need to do is to put together 2 of the values of the array and get a value.
I'll try to explain mysel...
5
Solved
I am trying to create a map in C++ with bitset as a key. However the compiler generates the following error messages
In file included from /usr/include/c++/4.6/string:50:0,
from /usr/include/c++/...
Aciculate asked 14/3, 2012 at 12:50
4
Solved
What are pros/cons of usage bitsets over enum flags?
namespace Flag {
enum State {
Read = 1 << 0,
Write = 1 << 1,
Binary = 1 << 2,
};
}
namespace Plain {
enum State {
Rea...
2
Solved
I have bitset<8> v8 and its value is something like "11001101", how can I convert it to char? I need a single letter. Like letter "f"=01100110.
P.S. Thanks for help. I needed this to illustrate...
3
Solved
When I use,
std::bitset<5> op1 (std::string("01001"));
std::bitset<5> op2 (std::string("10011"));
std::cout << (op1|=op2) << std::endl;
everything is fine obviously....
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