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Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
...iant type parameter is one which is allowed to vary down as the class is subtyped (alternatively, vary with subtyping, hence the "co-" prefix). More concretely:
trait List[+A]
List[Int] is a subtype of List[AnyVal] because Int is a subtype of AnyVal. This means that you may provide an instance ...
How to match a String against string literals in Rust?
...like this:
match &stringthing[..] {
"a" => println!("0"),
"b" => println!("1"),
"c" => println!("2"),
_ => println!("something else!"),
}
There's also an as_str method as of Rust 1.7.0:
match stringthing.as_str() {
"a" => println!("0"),
"b" => printl...
What is the correct way to document a **kwargs parameter?
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I think subprocess-module's docs is a good example. Give an exhaustive list of all parameters for a top/parent class. Then just refer to that list for all other occurrences of **kwargs.
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How do I check out a specific version of a submodule using 'git submodule'?
How would I go about adding a Git submodule for a specific tag or commit?
2 Answers
2
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Spring MVC: How to return image in @ResponseBody?
I'm getting image data (as byte[] ) from DB. How to return this image in @ResponseBody ?
14 Answers
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How do I get a string format of the current date time, in python?
...>>> import datetime
>>> datetime.date.today().strftime("%B %d, %Y")
'July 23, 2010'
>>> datetime.datetime.now().strftime("%I:%M%p on %B %d, %Y")
'10:36AM on July 23, 2010'
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Path of assets in CSS files in Symfony 2
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I have came across the very-very-same problem.
In short:
Willing to have original CSS in an "internal" dir (Resources/assets/css/a.css)
Willing to have the images in the "public" dir (Resources/public/images/devil.png)
Willing that twig takes that CSS, recompiles...
Set a default parameter value for a JavaScript function
...used if the value isn't defined (and ignored if the value is passed). In Ruby you can do it like this:
27 Answers
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What's better at freeing memory with PHP: unset() or $var = null
... overhead of a function call ( update , is actually a language construct), but it would be interesting to know if one is better than the other. I have been using unset() for most of my coding, but I've recently looked through a few respectable classes found off the net that use $var = null inste...
UIBarButtonItem with custom image and no border
I want to create a UIBarButtonItem with a custom image, but I don't want the border that iPhone adds, as my Image has a special border.
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