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Why is Scala's immutable Set not covariant in its type?
EDIT : Re-written this question based on original answer
3 Answers
3
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How do I call setattr() on the current module?
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import sys
thismodule = sys.modules[__name__]
setattr(thismodule, name, value)
or, without using setattr (which breaks the letter of the question but satisfies the same practical purposes;-):
globals()[name] = value
Note:...
A variable modified inside a while loop is not remembered
...et the variable $foo to the value 1 inside the first if statement, it works in the sense that its value is remembered after the if statement. However, when I set the same variable to the value 2 inside an if which is inside a while statement, it's forgotten after the while loop. It's behav...
What causes a TCP/IP reset (RST) flag to be sent?
...SET flag signifies that the receiver has become confused and so wants to abort the connection" but that is a little short of the detail I need. What could be causing this? And is it possible that some router along the way is responsible for it or would this always come from the other endpoint?
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Random float number generation
... random numbers in any arbitrary interval you choose. This is sufficient for learning purposes and toy programs. If you need truly random numbers with normal distribution, you'll need to employ a more advanced method.
This will generate a number from 0.0 to 1.0, inclusive.
float r = static_cas...
Python __call__ special method practical example
...se this special method, because one can simply create a new method and perform the same operation done in __call__ method and instead of calling the instance, you can call the method.
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Make Font Awesome icons in a circle?
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i.fa {
display: inline-block;
border-radius: 60px;
box-shadow: 0px 0px 2px #888;
padding: 0.5em 0.6em;
}
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" />
<i class="fa fa-wrench...
Most efficient way to check for DBNull and then assign to a variable?
This question comes up occasionally, but I haven't seen a satisfactory answer.
15 Answers
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How do I access the ModelState from within my View (aspx page)?
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Also worthy to note that you can just do ViewData.ModelState and if you want to display some conditional markup on errors you can do like this: @if (!ViewData.ModelState.IsValid)
– The Muffin Man
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Static method behavior in multi-threaded environment in java
...ant's answer is good. But I thought I would try and explain at a slightly more simple level for anybody who comes across this and is newish to Java. Here goes..
Memory in java is split up into two kinds - the heap and the stacks. The heap is where all the objects live and the stacks are where the t...