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What are some uses of template template parameters?
...n to deal with all specializations of H.
NOTE: I've been programming c++ for many years and have only needed this once. I find that it is a rarely needed feature (of course handy when you need it!).
I've been trying to think of good examples, and to be honest, most of the time this isn't necessary...
Downcasting in Java
Upcasting is allowed in Java, however downcasting gives a compile error.
11 Answers
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why does DateTime.ToString(“dd/MM/yyyy”) give me dd-MM-yyyy?
I want my datetime to be converted to a string that is in format "dd/MM/yyyy"
5 Answers
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PHP and Enumerations
...e native Enumerations. But I have become accustomed to them from the Java world. I would love to use enums as a way to give predefined values which IDEs' auto-completion features could understand.
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How to swap keys and values in a hash
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Ruby has a helper method for Hash that lets you treat a Hash as if it was inverted (in essence, by letting you access keys through values):
{a: 1, b: 2, c: 3}.key(1)
=> :a
If you want to keep the inverted hash, then Hash#invert should work for m...
“Unicode Error ”unicodeescape" codec can't decode bytes… Cannot open text files in Python 3 [duplica
...d to duplicate all backslashes:
"C:\\Users\\Eric\\Desktop\\beeline.txt"
Or prefix the string with r (to produce a raw string):
r"C:\Users\Eric\Desktop\beeline.txt"
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HTML5 Canvas Resize (Downscale) Image High Quality?
...To downsample an image, we need to turn each square of p * p pixels in the original image into a single pixel in the destination image.
For performances reasons Browsers do a very simple downsampling : to build the smaller image, they will just pick ONE pixel in the source and use its value for t...
Days between two dates? [duplicate]
What's the shortest way to see how many full days have passed between two dates?
Here's what I'm doing now.
4 Answers
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App Inventor 2 传感器应用教程 - 位置/方向/加速度传感器 · App Inventor 2 中文网
... 搜索 App Inventor 2 传感器应用教程 - 位置/方向/加速度传感器
概述
LocationSensor（位置传感器）
组件位置
核心属性
核心事件
基本用...
How to stop a PowerShell script on the first error?
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$ErrorActionPreference = "Stop" will get you part of the way there (i.e. this works great for cmdlets).
However for EXEs you're going to need to check $LastExitCode yourself after every exe invocation and determine whether that ...