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Real world use cases of bitwise operators [closed]
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Modern optimizers will convert expressions like (value% 2) != 0 automatically to the above expressions. godbolt.org/z/mYEBH4
– Ferrarezi
Dec 14 '19 at 16:29
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Position of least significant bit that is set
...n here or one of the ones on the Bit Twiddling Hacks page can trivially be converted to give lowest set bit using the above identities and has the advantage of being branchless.
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How to create a fixed-size array of objects
...de?](repeatElement(nil,
count: 64))
Converting an array of optionals into an array of objects (collapsing [SKSpriteNode?] into [SKSpriteNode]):
let flatSprites = optionalSprites.flatMap { $0 }
The count of the resulting flatSprites depends on the count of ob...
How to open, read, and write from serial port in C?
...al port. I have a USB device in Linux that uses the FTDI USB serial device converter driver. When I plug it in, it creates: /dev/ttyUSB1.
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Why use static_cast(x) instead of (int)x?
... = static_cast<CMyOtherStuff*>(pSomething); // Compiler error: Can't convert
pOther = (CMyOtherStuff*)(pSomething); // No compiler error.
// Same as reinterpret_cast<>
// and i...
What are bitwise operators?
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Take expr1 && expr2 for example.
Returns expr1 if it can be converted
to false; otherwise, returns expr2.
Thus, when used with Boolean values,
&& returns true if both operands are
true; otherwise, returns false.
a = "Cat" && "Dog" // t && t return...
How to generate a random number between a and b in Ruby?
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http://www.rubyinside.com/ruby-1-9-3-introduction-and-changes-5428.html
Converting to array may be too expensive, and it's unnecessary.
(a..b).to_a.sample
Or
[*a..b].sample
Array#sample
Standard in Ruby 1.8.7+.
Note: was named #choice in 1.8.7 and renamed in later versions.
But anyway...
Initialize a byte array to a certain value, other than the default null? [duplicate]
...he square brackets [] to declare an array. Also, your constants need to be convertible to byte, which numbers (ints) such as 4, 3, and 2 are not. So it has to be: new byte[] { (byte) 4, (byte) 3, (byte) 2}, or the hex syntax.
– Oliver
Dec 1 '14 at 21:44
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C# 通过代码安装、卸载、启动、停止服务 - .NET(C#) - 清泛IT论坛，有思想、有深度
#region Windows服务控制区
#region 安装服务
private void InstallService(string filepath, string serviceName)
{
try
&nb...
Left padding a String with Zeros [duplicate]
...tage is that if what you're padding is already an int, then you'll have to convert it to a String and back, which is undesirable.
So, if you know for sure that it's an int, khachik's answer works great. If not, then this is a possible strategy.
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