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Declaring array of objects
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@PrasathK, do you mean you're populating your array dynamically (e.g. through a loop)? Then you should follow Daniel's answer and use push().
– Frédéric Hamidi
Apr 1 '13 at 11:27
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In which situations do we need to write the __autoreleasing ownership qualifier under ARC?
...nil;
Will be transformed to:
NSError * __strong error = nil;
When you call your save method:
- ( BOOL )save: ( NSError * __autoreleasing * );
The compiler will then have to create a temporary variable, set at __autoreleasing. So:
NSError * error = nil;
[ database save: &error ];
Will ...
MySQL: @variable vs. variable. What's the difference?
...t a procedure variable is reinitialized to NULL each time the procedure is called, while the session-specific variable is not:
CREATE PROCEDURE prc_test ()
BEGIN
DECLARE var2 INT DEFAULT 1;
SET var2 = var2 + 1;
SET @var2 = @var2 + 1;
SELECT var2, @var2;
END;
SET @var2 = 1;
CALL pr...
What happens with constraints when a view is removed
...When I do something like this, I save the constraints like this for a view called view1:
self.portraitConstraints = [NSMutableArray new];
for (NSLayoutConstraint *con in self.view.constraints) {
if (con.firstItem == self.view1 || con.secondItem == self.view1) {
[self.portraitConstraints ...
Overloading member access operators ->, .*
...equent member lookup is also handled by an operator-> function. This is called the "drill-down behavior." The language chains together the operator-> calls until the last one returns a pointer.
struct client
{ int a; };
struct proxy {
client *target;
client *operator->() const...
What is Mocking?
...ck is like a stub but the test will also verify that the object under test calls the mock as expected. Part of the test is verifying that the mock was used correctly.
To give an example: You can stub a database by implementing a simple in-memory structure for storing records. The object under test c...
Make install, but not to default directories?
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the --prefix option is to ./configure which you call BEFORE make.
– Gus
May 13 '19 at 20:08
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Convert an NSURL to an NSString
... app bundle, in this case you can just use the [UIImage imageNamed:"name"] call which does the full job for you. But in the other cases you have to specify your full path.
– viggio24
Nov 14 '11 at 9:18
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Collections.emptyList() returns a List?
...nt, the compiler can figure out the generic type parameters for you. It's called type inference. For example, if you did this:
public Person(String name) {
List<String> emptyList = Collections.emptyList();
this(name, emptyList);
}
then the emptyList() call would correctly return a Lis...
Android 4.3 Bluetooth Low Energy unstable
...nect and create a fresh instance of gatt on each connect.
Don't forget to call android.bluetooth.BluetoothGatt#close()
Start a new thread inside onLeScan(..) and then connect. Reason: BluetoothDevice#connectGatt(Context context, boolean autoConnect, BluetoothGattCallback callback) always fails, if...