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What does void* mean and how to use it?
.... A void * can be converted to any other pointer type without an explicit cast. You cannot dereference a void * or do pointer arithmetic with it; you must convert it to a pointer to a complete data type first.
void * is often used in places where you need to be able to work with different pointer...
postgresql - sql - count of `true` values
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@EoghanM, see shorter answer involving cast.
– Dwayne Towell
Jan 3 '14 at 18:10
1
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Swift - Cast Int into enum:Int
...on Jeffery Thomas's answer.
to be safe place a guard statement unwrap the cast before using it,
this will avoid crashes
@IBAction func selectFilter(sender: AnyObject) {
guard let filter = MyTimeFilter(rawValue: (sender as UIButton).tag) else {
return
}
timeFilterSelec...
varbinary to string on SQL Server
...e binary representation of a string in SQL Server (for example returned by casting to varbinary directly or from the DecryptByPassPhrase or DECOMPRESS functions) you can just CAST it
declare @b varbinary(max)
set @b = 0x5468697320697320612074657374
select cast(@b as varchar(max)) /*Returns "This i...
How to create a generic array in Java?
...generic collection in Effective Java; Item 26. No type errors, no need to cast the array repeatedly. However this triggers a warning because it is potentially dangerous, and should be used with caution. As detailed in the comments, this Object[] is now masquerading as our E[] type, and can cause ...
Most efficient way to cast List to List
... a List<BaseClass> . It seems like it shouldn't be a problem since casting a SubClass to a BaseClass is a snap, but my compiler complains that the cast is impossible.
...
Converting an integer to a string in PHP
...ove have the same end value...
// ... And so do the two below
// Explicit cast
$items = (string)$var; // $items === "5";
// Function call
$items = strval($var); // $items === "5";
share
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improv...
Call an activity method from a fragment
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BE careful cause unexpected things happen if cast doesn't work.. :S
– Ewoks
Dec 14 '12 at 12:34
49
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How to negate a method reference predicate
... method reference. See @vlasec's answer below that shows how by explicitly casting the method reference to a Predicate and then converting it using the negate function. That is one way among a few other not too troublesome ways to do it.
The opposite of this:
Stream<String> s = ...;
int empt...
What is the difference between precision and scale?
...: Precision 4, scale 2 - will fail any number > 99.9999..; try: select cast (99.99999 as NUMBER(4,2)) from dual; //OK; select cast (100.9 as NUMBER(4,2)) from dual; //FAIL;
– Jama Djafarov
Mar 6 '15 at 17:47
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