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NSNumber *value;
value = @'X';       // char
value = @12345      // int
value = @12345ul    // unsigned long
value = @12345ll    // long long
value = @123.45f    // float
value = @123.45     // double
value = @YES        // BOOL

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/*
 Source: WWDC2012 Modern Objective-C talk
 How to get a constant literal container to work.
*/

@implementation MyClass

static NSArray *thePlanets;

+ (void)initialize {

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/*
 Enum with Fixed Underlying Type
 New with Xcode 4.4
 Via WWDC2012 Session 405 - Modern Objective-C

 Results in better code completion and stronger type checking.
 Use -Wconversion compiler flag to check for enum type errors.
 -Wswitch for checking if switch statement is fully handled for enum.
*/

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# .gitignore in use by Joris Kluivers
#
# Latest version:
# https://gist.github.com/gists/1923197

*.DS_Store

# Xcode
*.pbxuser
*.mode1v3

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/*
Thanks to @_bejo
*/

- (void)_insertGlobalRoomMessage:(id)msg atIndex:(NSUInteger)index
{
    NSIndexSet *changeSet = [NSIndexSet indexSetWithIndex:index];
    [self willChange:NSKeyValueChangeInsertion valuesAtIndexes:changeSet forKey:@"globalRoomMessages"];
    [(NSMutableArray *)self.globalRoomMessages insertObject:msg atIndex:index];
    [self didChange:NSKeyValueChangeInsertion valuesAtIndexes:changeSet forKey:@"globalRoomMessages"];

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/*
Source: Apple Developer - Understanding iOS View Compositing
Note: setting view.layer.cornerRadius and .masksToBounds
sends the view for rending to an offscreen buffer.
We want to avoid unnecessary rendering passes. 
Let the context do the work. 
*/

- (void)drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx {
	CGRect rect = layer.bounds;

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// via @_bejo
// then just add a DEBUG = 1 to debug target in xcode

#ifdef DEBUG

#define DebugLog( s, ... ) NSLog( @"<%@:(%d)> %@", [[NSString stringWithUTF8String:__FILE__] lastPathComponent], __LINE__, [NSString stringWithFormat:(s), ##__VA_ARGS__] )

#else
#define DebugLog( s, ... ) 

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/*
Copied and pasted from Tim Oliver's blog. 
Source: http://www.tim-oliver.com/2011/10/23/creating-the-uitableview-bevel-effect-in-coregraphics/
*/

void DrawInsetBeveledRoundedRect(CGContextRef context, CGRect rect, CGFloat radius, UIColor *fillColor) {
    //contract the bounds of the rectangle in to account for the stroke
    CGRect drawRect = CGRectInset(rect, 1.0f, 1.0f);
    
	//contract the height by 1 to account for the white bevel at the bottom

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/*
Copied and pasted from David Hamrick's blog. 

Source: http://www.davidhamrick.com/2011/08/07/using-blocks-for-drawing-to-avoid-subclasssing-in-objective-c.html
*/

typedef void(^DrawView_DrawBlock)(UIView* v,CGContextRef context);

@interface DrawView : UIView

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/**
 Provides the ability to verify key paths at compile time.
 
 If "keyPath" does not exist, a compile-time error will be generated.
 
 Example:
    // Verifies "isFinished" exists on "operation".
    NSString *key = SQKeyPath(operation, isFinished);
 
    // Verifies "isFinished" exists on self.