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Objective-C Static Class Level variables
...ialize
{
if (! classVariableName)
classVariableName = [[ClassB alloc] init];
}
+(void) classMethodName
{
[classVariableName doSomething];
}
-(void) instanceMethodName
{
[classVariableName doSomething];
}
...
@end
References:
Class variables explained comparing Objective-C...
What is the difference between Scope_Identity(), Identity(), @@Identity, and Ident_Current()?
... of the inserted record from the trigger.
IdentCurrent: The last identity allocated for the table.
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list.clear() vs list = new ArrayList(); [duplicate]
... one way holds onto memory, the other one throws out its memory and gets reallocated from scratch (with the default capacity). Which is better depends on whether you want to reduce garbage-collection churn or minimize the current amount of unused memory. Whether the list sticks around long enough to...
Keystore type: which one to use?
...S11, for PKCS#11 libraries, typically for accessing hardware cryptographic tokens, but the Sun provider implementation also supports NSS stores (from Mozilla) through this.
BKS, using the BouncyCastle provider (commonly used for Android).
Windows-MY/Windows-ROOT, if you want to access the Windows ce...
Use 'class' or 'typename' for template parameters? [duplicate]
...ainer, typename Type>
class MyContainer: public Container<Type, std::allocator<Type>>
{ /*...*/ };
In this example, typename Container would have generated a compiler error, something like this:
error: expected 'class' before 'Container'
...
MySQL InnoDB not releasing disk space after deleting data rows from table
... 2M data rows. When I deleted data rows from the table, it did not release allocated disk space. Nor did the size of the ibdata1 file reduce after running the optimize table command.
...
Java Desktop application: SWT vs. Swing [closed]
...
@JanTobola It's plain wrong. Native components use memory allocated on the native heap, not only on the Java heap. I've worked on large GUIs using Netbeans Platform, Eclipse RCP, SWT and Swing.There were some serious concerns of memory footprint in Swing in very early versions of Ja...
Large, persistent DataFrame in pandas
...(here's a tedious one: you could transcribe the file row-by-row into a pre-allocated NumPy array or memory-mapped file--np.mmap), but it's one I'll be working on in the near future. Another solution is to read the file in smaller pieces (use iterator=True, chunksize=1000) then concatenate then with ...
What's the difference between unit tests and integration tests? [duplicate]
... They usually require resources like database instances and hardware to be allocated for them. The integration tests do a more convincing job of demonstrating the system works (especially to non-programmers) than a set of unit tests can, at least to the extent the integration test environment resemb...
Remove characters from C# string
...iency? Won't regular expressions be more efficient in sense of new strings allocations?
– Marek
Nov 19 '18 at 9:38
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