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How is a CRC32 checksum calculated?
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The polynomial for CRC32 is:
x32 + x26 + x23 + x22 + x16 + x12 + x11 + x10 + x8 + x7 + x5 + x4 + x2 + x + 1
Wikipedia
CRC calculation
Or in hex and binary:
0x 01 04 C1 1D B7
1 0000 0100 1100 0001 0001 1101 1011 0111
The highest term ...
Convert a positive number to negative in C#
You can convert a negative number to positive like this:
22 Answers
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In C++, is it still bad practice to return a vector from a function?
...rn large objects—such as vectors/arrays—in many programming languages. Is this style now acceptable in C++0x if the class has a move constructor, or do C++ programmers consider it weird/ugly/abomination?
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c++11 Return value optimization or move? [duplicate]
... method:
Foo f()
{
Foo result;
mangle(result);
return result;
}
This will already allow the use of the move constructor, if one is available. In fact, a local variable can bind to an rvalue reference in a return statement precisely when copy elision is allowed.
Your second version actively...
Is short-circuiting logical operators mandated? And evaluation order?
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using the built-in meaning of the operators in these expressions, there is a sequence point after the evaluation of the first expression (12).
In C++ there is an extra trap: short-circuiting does NOT apply to types that overload operators || and &&.
Footnote 12: The operators indica...
What is the purpose of wrapping whole Javascript files in anonymous functions like “(function(){ … }
...ng a lot of Javascript lately and I have been noticing that the whole file is wrapped like the following in the .js files to be imported.
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How to avoid null checking in Java?
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This to me sounds like a reasonably common problem that junior to intermediate developers tend to face at some point: they either don't know or don't trust the contracts they are participating in and defensively overcheck for n...
Why it's not possible to use regex to parse HTML/XML: a formal explanation in layman's terms
There is no day on SO that passes without a question about parsing (X)HTML or XML with regular expressions being asked.
9 ...
What does the “Just” syntax mean in Haskell?
I have scoured the internet for an actual explanation of what this keyword does. Every Haskell tutorial that I have looked at just starts using it randomly and never explains what it does (and I've looked at many).
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What is LDAP used for?
I know that LDAP is used to provide some information and to help facilitate authorization.
16 Answers
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