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What does `:_*` (colon underscore star) do in Scala?
...Child - sequence
: - type ascription, a hint that helps compiler to understand, what type does that expression have
_* - placeholder accepting any value + vararg operator
child ++ newChild : _* expands Seq[Node] to Node* (tells the compiler that we're rather working with a varargs, than a sequence...
Explain the concept of a stack frame in a nutshell
...In the case of a call stack, a stack frame would represent a function call and its argument data.
If I remember correctly, the function return address is pushed onto the stack first, then the arguments and space for local variables. Together, they make the "frame," although this is likely architec...
What is the syntax rule for having trailing commas in tuple definitions?
...hen you won't add another line to the end expecting to add another element and instead just creating a valid expression:
a = [
"a",
"b"
"c"
]
Assuming that started as a 2 element list that was later extended it has gone wrong in a perhaps not immediately obvious way. Always include the t...
CSS opacity only to background color, not the text on it? [duplicate]
...assign the opacity property to the background property of a div only and not to the text on it?
11 Answers
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Why can't I use a list as a dict key in python?
...nt's values, for instance when checking (in-)equality. Many would - understandably - expect that you can use any list [1, 2] to get the same key, where you'd have to keep around exactly the same list object. But lookup by value breaks as soon as a list used as key is modified, and for lookup by iden...
Convert Year/Month/Day to Day of Year in Python
...
A very minor and arguably pedantic addition, but using date.today() rather than datetime.now() also works and emphasizes the nature of the operation a bit more.
– Jeremy
Dec 30 '13 at 6:57
...
Curious null-coalescing operator custom implicit conversion behaviour
...hen there is a lifted conversion involving two nullable types on the left-hand side of the coalescing operator.
I have not yet identified where precisely things go wrong, but at some point during the "nullable lowering" phase of compilation -- after initial analysis but before code generation -- we...
How to check if mysql database exists
... OK, apparently PHPMyAdmin just displays all database names in lower case, and your query works using both anyway
– Hubro
Jun 15 '12 at 13:21
1
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ros 基本调试 - 更多技术 - 清泛网 - 专注C/C++及内核技术
ros 基本调试原文地址：http: www.reactos.org wiki Debugging欢迎拍砖。。本文讲述了调试ROS的各种方法和必要步骤。目录1.简介2.可用的调试方法2.1通...原文地址：http://www.reactos.org/wiki/Debugging
欢迎拍砖。。
本文讲述了调试ROS的各种方...
Print “hello world” every X seconds
...
You can also take a look at Timer and TimerTask classes which you can use to schedule your task to run every n seconds.
You need a class that extends TimerTask and override the public void run() method, which will be executed everytime you pass an instance o...