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Give examples of functions which demonstrate covariance and contravariance in the cases of both over
Please show a good example for covariance and contravariance in Java.
3 Answers
3
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Vim users, where do you rest your right hand? [closed]
Longtime vim users, do you keep your fingers onjkl; or hjkl in normal mode?
5 Answers
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How to select the rows with maximum values in each group with dplyr? [duplicate]
... filter(value == max(value)) %>%
arrange(A,B,C)
Seems to work:
identical(
as.data.frame(result),
ddply(df, .(A, B), function(x) x[which.max(x$value),])
)
#[1] TRUE
As pointed out in the comments, slice may be preferred here as per @RoyalITS' answer below if you strictly only wa...
Switching to a TabBar tab view programmatically?
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Try this code in Swift or Objective-C
Swift
self.tabBarController.selectedIndex = 1
Objective-C
[self.tabBarController setSelectedIndex:1];
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How to get the parent dir location
...out dirname. It isn't obvious to everyone that applying dirname to a directory yields the parent directory.
– Marcelo Cantos
May 12 '10 at 9:09
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“A project with an Output type of Class Library cannot be started directly”
I downloaded a C# project and I wish to debug the project to see how an algorithm implementation works.
12 Answers
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How to create a table from select query result in SQL Server 2008 [duplicate]
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What is the advantage of GCC's __builtin_expect in if else statements?
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after_if:
You can see that the instructions are arranged in such an order that the bar case precedes the foo case (as opposed to the C code). This can utilise the CPU pipeline better, since a jump thrashes the already fetched instructions.
Before the jump is executed, the instructions below ...
How do you round a number to two decimal places in C#?
...following overload:
Math.Round(a, 2, MidpointRounding.ToEven);
There's more information on it here.
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Stop Visual Studio from launching a new browser window when starting debug?
...en with the web site I'm debugging. I don't need VS to launch another one for me every time I need to debug.
17 Answers
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