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map vs. hash_map in C++
I have a question with hash_map and map in C++. I understand that map is in STL, but hash_map is not a standard. What's the difference between the two?
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How do I shutdown, restart, or log off Windows via a bat file?
...own -l — Logs off.
shutdown -h — Hibernates.
Note: There is a common pitfall wherein users think -h means "help" (which it does for every other command-line program... except shutdown.exe, where it means "hibernate"). They then run shutdown -h and accidentally turn off their computers. Watch ou...
Capturing standard out and error with Start-Process
...That's how Start-Process was designed for some reason. Here's a way to get it without sending to file:
$pinfo = New-Object System.Diagnostics.ProcessStartInfo
$pinfo.FileName = "ping.exe"
$pinfo.RedirectStandardError = $true
$pinfo.RedirectStandardOutput = $true
$pinfo.UseShellExecute = $false
$pin...
How can you profile a Python script?
...m time to run or people boast of how fast their particular solution runs. With Python, sometimes the approaches are somewhat kludgey - i.e., adding timing code to __main__ .
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How to completely uninstall Visual Studio 2010?
...emove Visual Studio 2010 from my computer. When you install Visual Studio, it also installs a bunch of programs (about 55) in the add/remove programs panel ( appwiz.cpl ).
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How to convert string into float in JavaScript?
...f they're meant to be separate values, try this:
var values = "554,20".split(",")
var v1 = parseFloat(values[0])
var v2 = parseFloat(values[1])
If they're meant to be a single value (like in French, where one-half is written 0,5)
var value = parseFloat("554,20".replace(",", "."));
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How can I resize an image using Java?
...edBI.createGraphics();
if (preserveAlpha) {
g.setComposite(AlphaComposite.Src);
}
g.drawImage(originalImage, 0, 0, scaledWidth, scaledHeight, null);
g.dispose();
return scaledBI;
}
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CABasicAnimation resets to initial value after animation completes
I am rotating a CALayer and trying to stop it at its final position after animation is completed.
15 Answers
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What is an “unwrapped value” in Swift?
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cantBeNil = nil // can't do this
To get the value from your variable if it is optional, you have to unwrap it. This just means putting an exclamation point at the end.
var canBeNil : Int? = 4
println(canBeNil!)
Your code should look like this:
let optionalSquare: Square? = Square(sideLength: ...
Difference between string and char[] types in C++
I know a little C and now I'm taking a look at C++.
I'm used to char arrays for dealing with C strings, but while I look at C++ code I see there are examples using both string type and char arrays:
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