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How do I define and use an ENUM in Objective-C?
... delegate/datasource). Importing the header of the delegate/datasource resulted in an error and seems too much for a simple need. So I created a new .h file with the enum declared and imported it on both viewControllers.h file. Worked like a charm.
– Leandro Alves
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Why does Java's hashCode() in String use 31 as a multiplier?
... value 31 was chosen because it is an odd prime. If it were even and the multiplication overflowed, information would be lost, as multiplication by 2 is equivalent to shifting. The advantage of using a prime is less clear, but it is traditional. A nice property of 31 is that the multiplication can b...
What is the difference between the template method and the strategy patterns?
...done on init, run and done.
Example of a strategy:
array.sort (IComparer<T> comparer)
Here, when writing a comparer, you do not inherit from an array. Array delegates the comparison algorithm to a comparer.
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How to customize the background/border colors of a grouped table view cell?
...8.
// Copyright 2008 __MyCompanyName__. All rights reserved.
//
#import <UIKit/UIKit.h>
typedef enum {
CustomCellBackgroundViewPositionTop,
CustomCellBackgroundViewPositionMiddle,
CustomCellBackgroundViewPositionBottom,
CustomCellBackgroundViewPositionSingle
} CustomCellB...
How to “grep” for a filename instead of the contents of a file?
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This is unnecessary. Find has that functionality built-in with the -regex option.
– whereswalden
Aug 11 '14 at 21:05
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Specifying a custom DateTime format when serializing with Json.Net
...as-needed basis, as you suggested. It turns out Json.Net already has a built-in IsoDateTimeConverter that lets you specify the date format. Unfortunately, you can't set the format via the JsonConverter attribute, since the attribute's sole argument is a type. However, there is a simple solution: ...
ggplot with 2 y axes on each side and different scales
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@hadley: Mostly I agree, but there is a genuine use for multiple y scales - the use of 2 different units for the same data, e.g., Celsius and Fahrenheit scales on temperature time series.
– Richie Cotton
Aug 25 '10 at 13:08
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Where to define custom error types in Ruby and/or Rails?
...eptions.rb
and defined as:
module GemName
class AuthenticationError < StandardError; end
class InvalidUsername < AuthenticationError; end
end
an example of this would be something like this in httparty
For Ruby on Rails
Put them in your lib/ folder under a file called exceptions.r...
Are members of a C++ struct initialized to 0 by default?
...yields a proper initial value (0 for int, 0.0 for double, calling the default constructor for user defined types that have user declared constructors, ...). This is important especially if your struct is a template.
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How to do 3 table JOIN in UPDATE query?
...rd thing is however that my HeidiSQL software reports zero affected rows, although the data shows the updates were done.
– Pianoman
Feb 1 '16 at 8:06
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