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Objective-C: Reading a file line by line
...);
This code reads non-newline characters from the file, up to 4095 at a time. If you have a line that is longer than 4095 characters, it keeps reading until it hits a newline or end-of-file.
Note: I have not tested this code. Please test it before using it.
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Sorting a vector of custom objects
...ng the ordering logic which might be a severe drawback (at least when link time optimization/code generation is not applied).
Ways to achieve comparability of class X in order to use standard library sorting algorithms
Let std::vector<X> vec_X; and std::vector<Y> vec_Y;
1. Overload T:...
Python memoising/deferred lookup property decorator
...ctor but only upon first read. These attributes do not change over the lifetime of the instance, but they're a real bottleneck to calculate that first time and only really accessed for special cases. Hence they can also be cached after they've been retrieved from the database (this therefore fits th...
What do Clustered and Non clustered index actually mean?
...have many non clustered indices, although each new index will increase the time it takes to write new records.
It is generally faster to read from a clustered index if you want to get back all the columns. You do not have to go first to the index and then to the table.
Writing to a table with a c...
How to convert Strings to and from UTF8 byte arrays in Java
...harset class. The JDK documentation lists supported encodings.
90% of the time, such conversions are performed on streams, so you'd use the Reader/Writer classes. You would not incrementally decode using the String methods on arbitrary byte streams - you would leave yourself open to bugs involving ...
How do I write a custom init for a UIView subclass in Swift?
...In this case, you would initialize them in awakeFromNib() or at some later time.
class TestView : UIView {
var s: String?
var i: Int?
init(s: String, i: Int) {
self.s = s
self.i = i
super.init(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
}
require...
How to get the current date/time in Java [duplicate]
What's the best way to get the current date/time in Java?
28 Answers
28
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How to find difference between two Joda-Time DateTimes in minutes
...
This will get you the difference between two DateTime objects in milliseconds:
DateTime d1 = new DateTime();
DateTime d2 = new DateTime();
long diffInMillis = d2.getMillis() - d1.getMillis();
sha...
How do I find the install time and date of Windows?
...on, but how can I find out (hopefully via an API/registry key) the install time and date of Windows?
19 Answers
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What is the purpose of the reader monad?
...r passing (implicit) configuration information through a computation.
Any time you have a "constant" in a computation that you need at various points, but really you would like to be able to perform the same computation with different values, then you should use a reader monad.
Reader monads are a...