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What are the basic rules and idioms for operator overloading?
...obj from stream
if( /* no valid object of T found in stream */ )
is.setstate(std::ios::failbit);
return is;
}
When implementing operator>>, manually setting the stream’s state is only necessary when the reading itself succeeded, but the result is not what would be expected.
Func...
iOS 6 apps - how to deal with iPhone 5 screen size? [duplicate]
...could simply expand the content in the middle to use up that extra points. Set the autoresizing mask of the center content to expand in both directions.
view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
It works great out of the box for table views, howev...
How to do an INNER JOIN on multiple columns
...rts table twice - then you can use both from and to tables in your results set:
SELECT
Flights.*,fromAirports.*,toAirports.*
FROM
Flights
INNER JOIN
Airports fromAirports on Flights.fairport = fromAirports.code
INNER JOIN
Airports toAirports on Flights.tairport = toAirports.code
WHERE...
What is the purpose of Rank2Types?
...s. Take for example a plain old function of the following rank-1 type (to set the scene):
f :: ∀r.∀a.((a → r) → a → r) → r
To use f, the caller first must choose what types to use for r and a, then supply an argument of the resulting type. So you could pick r = Int and a = String:
...
Fastest way to iterate over all the chars in a String
In Java, what would the fastest way to iterate over all the chars in a String, this:
8 Answers
...
How do you test functions and closures for equality?
...t = (Int, Int)
let (hi, lo) = unsafeBitCast(f, IntInt.self)
let offset = sizeof(Int) == 8 ? 16 : 12
let ptr = UnsafePointer<Int>(lo+offset)
return (ptr.memory, ptr.successor().memory)
}
@infix func === <A,R>(lhs:A->R,rhs:A->R)->Bool {
let (tl, tr) = (peekFun...
How to close IPython Notebook properly?
...and commandline? So that people who want the server to always run can just set up the correct config.
– gaborous
Mar 22 '13 at 11:25
7
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Piping command output to tee but also save exit code of command [duplicate]
...
You can set the pipefail shell option option on to get the behavior you want.
From the Bash Reference Manual:
The exit status of a pipeline is the exit status of the last command
in the pipeline, unless the pipefail option is ...
Pure virtual function with implementation
...classes to always perform their own work but also be able to call a common set of functionality.
Note that even though it's permitted by the language, it's not something that I see commonly used (and the fact that it can be done seems to surprise most C++ programmers, even experienced ones).
...
Why does scanf() need “%lf” for doubles, when printf() is okay with just “%f”?
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