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@property retain, assign, copy, nonatomic in Objective-C
...retain is the same as strong.
-apple says if you write retain it will auto converted/work like strong only.
-methods like "alloc" include an implicit "retain"
Example:
@property (nonatomic, retain) NSString *name;
@synthesize name;
assign
-assign is the default and simply performs a variable...
When do we have to use copy constructors?
...ovided copy constructor will break the internal intra-object associations, converting them to inter-object associations.
An example:
struct MarriedMan;
struct MarriedWoman;
struct MarriedMan {
// ...
MarriedWoman* wife; // association
};
struct MarriedWoman {
// ...
MarriedMan*...
JavaScript hashmap equivalent
...doo.
When using objects as maps, you have to remember that the key will be converted to a string value via toString(), which results in mapping 5 and '5' to the same value and all objects which don't overwrite the toString() method to the value indexed by '[object Object]'. You might also involuntar...
“Single-page” JS websites and SEO
...ttps://stackoverflow.com/a/13813102/1595913).
(test the link's validity by converting the link to your url scheme and testing against existence of content by querying a static or a dynamic source. if it's not valid send a 404 response.)
When the request is not from a google bot, you just process no...
Using std Namespace
...entifier not recognized' error you often end up with a more obscure 'can't convert argument X' or 'unable to generate function from template' style error. Worse is if a wrong function gets called silently. It's rare, but happens.
– CB Bailey
Aug 12 '09 at 21:47...
Select the values of one property on all objects of an array in PowerShell
...output by Get-ChildItem) or [pscustomobject] instances (e.g., as output by Convert-FromCsv).
The reason is that [pscustomobject] properties are dynamically managed by PowerShell, and it can access them more quickly than the regular properties of a (statically defined) regular .NET type. Both scenari...
Ruby on Rails Server options [closed]
...scribes what the HTTP response should look like, and Mongrel takes care of converting it to an actual HTTP response (the actual bytes) and sends it back over the socket.
However Mongrel is quite dated, nowadays it is no longer maintained. Newer alternative application servers are:
Phusion Passen...
Compile time string hashing
...mpty string and possibly certain other strings beginning with a char which converts to (unsigned)-1 if there is any; and returns 1 for all other strings. Rewrite with ternary conditional operator?
– ndkrempel
May 20 '12 at 17:12
...
Java 8: Lambda-Streams, Filter by Method with Exception
...
propagate here receives java.util.concurrent.Callable as a parameter and converts any exception caught during the call into RuntimeException. There is a similar conversion method Throwables#propagate(Throwable) in Guava.
This method seems being essential for lambda method chaining, so I hope one ...
Lock Escalation - What's happening here?
...t)
EXEC('INSERT INTO dbo.Tmp_Test (ID, Col1, Col2)
SELECT ID, CONVERT(nvarchar(10), Col1), Col2 FROM dbo.Test WITH (HOLDLOCK TABLOCKX)')
GO
DROP TABLE dbo.Test
GO
EXECUTE sp_rename N'dbo.Tmp_Test', N'Test', 'OBJECT'
GO
ALTER TABLE dbo.Test ADD CONSTRAINT
PK_Test PRIMARY KEY CLUSTER...