This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
Can I create Java-like interfaces in Perl?
How the Java like interfaces is supported in Perl?
http://en.wikipedia.org/wiki/Interface_(Java)
If you're using Moose, you could create role with nothing but a requires statement.
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In ScalaTest is there any difference between `should`, `can`, `must`
(1 answer)
Closed 6 years ago.
Both scalatest and Specs2 have separate matchers for should and must.
However, I cannot find any explanation for why you would use one or the other.
What exactly is the difference?
There is no difference, this is purely a syntactic preference. I personally prefer to use must in specs2 because I think that should can make people think that an expectation is optional.
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Swift 2.0 - Binary Operator "|" cannot be applied to two UIUserNotificationType operands
(4 answers)
Closed 7 years ago.
Can someone explain me why it shows error here. I follow the tutorial, but maybe in swift 2, it doesn't true if typing like this.
You are probably following tutorial from older version of Swift. Since its growing really fast, I suggest following the newest tutorials. In Swift 2 you should use collection, not | binary operator. Like:
[UIUserNotificationType.Sound, UIUserNotificationType.Badge]
Your problem is with the first UIUserNotificationType, which is missing (I guess) the .Alert part.
This question already has answers here:
Closed 11 years ago.
Possible Duplicate:
What does #synthesize window=_window do?
Question about #synthesize
Some developers tend to use this convention:
#syntheisze abc = _abc;
What is the true benefit of this? Why do they do it this way? The first thing I notice is that it makes the code a lot harder to read.
This is a common code convention:
See this Google Objective-C coding directives:
http://google-styleguide.googlecode.com/svn/trunk/objcguide.xml?showone=Properties#Properties
This question already has answers here:
Closed 11 years ago.
Possible Duplicate:
Placement of the asterisk in Objective-C
What is the differenct between the following:
(Assume we have a class calculator)
Calculator* calc;
Calculator *calc;
Also what is the need for pointers? Is it not possible to omit the star?
There is no difference between those two declarations, you could also do Calculator * calc if you're feeling adventurous.
As far as if you can omit the star, no, you cannot. It is a carry over from C and shows that calc is a pointer to a Calculator, and not a Calculator itself.
There is no difference between the 2 declaration is just an preference for typing.
Every thing on computers uses pointers. You need pointers java, c#, etc use pointers.
No is not posible to omit the star.
This question already has answers here:
Closed 12 years ago.
Possible Duplicate:
Practical uses of a Dynamic type in Scala
It has just been tweeted that Martin Odersky has just added Dynamic into trunk. Apparently, this is HUGE. Why?
Dynamic adds developer driven dynamic binding (dynamic dispatch) and gives a subset of the features of dynamic typing to Scala.
See this pastie from Jorge Ortiz:
http://pastie.org/1469174