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What is java interface equivalent in Ruby?

...o members at all: just take a look at java.io.Serializable and java.lang.Cloneable; those two interfaces mean very different things, yet they have the exact same signature. So, if two interfaces that mean different things, have the same signature, what exactly is the interface even guaranteeing you?...
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Evenly space multiple views within a container view

...e extra top/bottom space constraints on your labels to superview; just the ones to the 'space views'. This will be satisfiable since the top and bottom constraints are on 'Space View 1' and 'Spacer View 4' respectively. Duh 1: I duplicated my view and merely put it in landscape mode so you could se...
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sendmail: how to configure sendmail on ubuntu? [closed]

... One thing that isn't clear is what replacements to make in AuthInfo:your.isp.net "U:root" "I:user" "P:password" Specifically, how do you replace U:root and I:user – Tom Haws Aug 29 '13 ...
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Just what is an IntPtr exactly?

...epresents a physical location in memory. A null pointer is (almost always) one that points to 0, and is widely recognized as "not pointing to anything". Since systems have different amounts of supported memory, it doesn't always take the same number of bytes to hold that number, so we call a "native...
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Visual Studio 64 bit?

...MK: The office "recreational speculation" doesn't survive the sniff test. Nonetheless, the part of the article relevant to the question (re: VS x64) seems pretty solid. – Adam Robinson Mar 25 '10 at 15:00 ...
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Android and setting alpha for (image) view alpha

... the former, but it's the counterpart to View.setAlpha(float). And as mentioned multiple times here already, android:alpha / View.setAlpha(float) are available as of API level 11 only. – sschuberth Nov 19 '13 at 20:33 ...
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swift case falling through

... as follows: var testVal = "hello" var result = 0 switch testVal { case "one", "two": result = 1 default: result = 3 } Alternatively, you can use the fallthrough keyword: var testVal = "hello" var result = 0 switch testVal { case "one": fallthrough case "two": result = 1 defaul...
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Create two blank lines in Markdown

... Markdown treats multiple blank lines as one blank line, you could pre tag to contain blank lines. As markdown inside pre block is not parsed. I would prefer not to do this, instead add as many <br>'s as needed. – vmx Dec...
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What is “vectorization”?

... @StephenCanon how can one check whether or not some lines have been vectorized? If one would use objdump, what would one look for in the output of objdump? – user1823664 Jun 9 '17 at 13:49 ...
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Create code first, many to many, with additional fields in association table

...join table with additional properties you will have to create actually two one-to-many relationships. It could look like this: public class Member { public int MemberID { get; set; } public string FirstName { get; set; } public string LastName { get; set; } public virtual ICollect...