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What is the difference between concurrent programming and parallel programming?
...amming), it's not necessarily going to be executed as such (parallel execution), since it depends on whether the machine can handle several threads.
Here's a visual example. Threads on a non-threaded machine:
-- -- --
/ \
>---- -- -- -- -- ---->>
Threads o...
What's so bad about Template Haskell?
...r; you can have a value of type Exp, but you don't know if it is an expression that represents a [Char] or a (a -> (forall b . b -> c)) or whatever. TH would be more reliable if one could express that a function may only generate expressions of a certain type, or only function declarations, or...
腾讯Tencent开源框架介绍（持续更新） - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...架，Tars 是将腾讯内部使用的微服务架构 TAF（Total Application Framework）多年的实践成果总结而成的开源项目，成熟度及稳定性高。支持多语言的高性能 RPC 开发框架和配套一体化的服务治理平台。
毫无疑问，微服务的核心框架采...
JavaScript, Node.js: is Array.forEach asynchronous?
I have a question regarding the native Array.forEach implementation of JavaScript: Does it behave asynchronously?
For example, if I call:
...
Is it possible to make the -init method private in Objective-C?
...ect at any time.
What you can do is throw an NSInternalInconsistencyException if your -init method is invoked:
- (id)init {
[self release];
@throw [NSException exceptionWithName:NSInternalInconsistencyException
reason:@"-init is not a valid initializer fo...
How can I read input from the console using the Scanner class in Java?
...e input, or just validate the username variable.
You'll find more information on their implementation in the API Documentation for java.util.Scanner
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How to play audio?
...
If you don't want to mess with HTML elements:
var audio = new Audio('audio_file.mp3');
audio.play();
function play() {
var audio = new Audio('https://interactive-examples.mdn.mozilla.net/media/examples/t-rex-roar.mp3');
audio.play();
}
<button onclick="play()"&...
How can I disable the UITableView selection?
...
For me, the following worked fine:
tableView.allowsSelection = false
This means didSelectRowAt# simply won't work. That is to say, touching a row of the table, as such, will do absolutely nothing. (And hence, obviously, there will never be a selected-animation.)
(Note that if, o...
Why did my Git repo enter a detached HEAD state?
... a branch, and get a detach HEAD, except:
it has an explicit --detach option
To check out commit HEAD~3 for temporary inspection or experiment without creating a new branch:
git switch --detach HEAD~3
HEAD is now at 9fc9555312 Merge branch 'cc/shared-index-permbits'
it cannot detached by...
How to convert a PNG image to a SVG? [closed]
... # PNG to PNM
potrace file.pnm -s -o file.svg # PNM to SVG
Explain options
potrace -s => Output file is SVG
potrace -o file.svg => Write output to file.svg
Example
Input file = 2017.png
convert 2017.png 2017.pnm
Temporary file = 2017.pnm
potrace 2017.pnm -s -o 2017.svg
Output ...