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Why do this() and super() have to be the first statement in a constructor?
...on't see why you can't be allowed something along the lines of Constructor(int x) { this.field1 = x; super(); }. Sure, you shouldn't need to in an ideal world where you control the code, but that's not always the case. The reason I looked this up in the first place was because I was annoyed I couldn...
When do I need to use Begin / End Blocks and the Go keyword in SQL Server?
...step...
IF EXISTS (SELECT * FROM my_table WHERE id = @id)
BEGIN
INSERT INTO Log SELECT @id, 'deleted'
DELETE my_table WHERE id = @id
END
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What is the difference between loose coupling and tight coupling in the object oriented paradigm?
...ass can be consumed and tested independently of other (concrete) classes.
Interfaces are a powerful tool to use for decoupling. Classes can communicate through interfaces rather than other concrete classes, and any class can be on the other end of that communication simply by implementing the inter...
Objective-C declared @property attributes (nonatomic, copy, strong, weak)
... you use this attribute when you have a property of primitive type (float, int, BOOL...)
Retain
retain is required when the attribute is a pointer to a reference counted object that was allocated on the heap. Allocation should look something like:
NSObject* obj = [[NSObject alloc] init]; // ref coun...
What are the rules about using an underscore in a C++ identifier?
...n't "import" the C Standard. It references the C Standard. The C++ library introduction says "The library also makes available the facilities of the Standard C Library". It does that by including headers of the C Standard library with appropriate changes, but not by "importing" it. The C++ Standard ...
When splitting an empty string in Python, why does split() return an empty list while split('\n') re
... 12,400
'''
>>> for line in data.splitlines():
print line.split()
['Shasta', 'California', '14,200']
['McKinley', 'Alaska', '20,300']
['Fuji', 'Japan', '12,400']
The second mode is useful for delimited data such as CSV where repeated commas denote empty fields. For exam...
Scheduling recurring task in Android
...es running until the service becomes available.
Note: The Alarm Manager is intended for cases where you want to have your application code run at a specific time, even if your application is not currently running. For normal timing operations (ticks, timeouts, etc) it is easier and much more efficie...
Speed up the loop operation in R
...Radford Neal has done a bunch of optimizations, some of which were adopted into R Core, and many others which were forked off into pqR.
And lastly, if all of the above still doesn't get you quite as fast as you need, you may need to move to a faster language for the slow code snippet. The combina...
Why is it bad style to `rescue Exception => e` in Ruby?
... from everything, including subclasses such as SyntaxError, LoadError, and Interrupt.
Rescuing Interrupt prevents the user from using CTRLC to exit the program.
Rescuing SignalException prevents the program from responding correctly to signals. It will be unkillable except by kill -9.
Rescuing Sy...
Instance variables vs. class variables in Python
... @Devin, yep, I've heard of the Borg pattern, since I'm the one who introduced it (in 2001, cfr code.activestate.com/recipes/… ;-). But there's nothing wrong, in simple cases, with simply having a single instance with no enforcement.
– Alex Martelli
A...