tjw

#import <Foundation/Foundation.h>

/*

clang --analyze readonly-property-analyzer.m

readonly-property-analyzer.m:20:2: warning: Incorrect decrement of the reference count of an object that is not owned at this point by the caller
        [_string release];
        ^~~~~~~~~~~~~~~~~
1 warning generated.

tjw

#import <Cocoa/Cocoa.h>

/*
clang -fobjc-arc -Wall preview-from-url.m -o /tmp/preview-from-url -framework Cocoa

When run on a file in my iCloud Drive:

2015-01-08 16:39:54.008 preview-from-url[23221:261259] NSURLThumbnailDictionaryKey = {
    NSThumbnail1024x1024SizeKey = "<NSImage 0x7fd6b34228f0 Size={790, 1024} Reps=(\n    \"<NSCGImageSnapshotRep:0x7fd6b34249e0 cgImage=<CGImage 0x7fd6b3423de0>>\"\n)>";
}

tjw

/*
Radar 18996669: Swift: Attempting to instantiate instance via class pointer crashes

% xcrun -sdk macosx swiftc instantiate-from-class.swift
0  swift                    0x0000000107668b68 llvm::sys::PrintStackTrace(__sFILE*) + 40
1  swift                    0x0000000107669054 SignalHandler(int) + 452
2  libsystem_platform.dylib 0x00007fff95c74f1a _sigtramp + 26
3  libsystem_platform.dylib 0x0000000108bd3e00 _sigtramp + 1928720128
4  swift                    0x0000000107a675fc collectFullName(swift::ArchetypeType const*, llvm::SmallVectorImpl<char>&) + 92
5  swift                    0x0000000107a675c8 collectFullName(swift::ArchetypeType const*, llvm::SmallVectorImpl<char>&) + 40

tjw

/*

Subclassing a FloatLiteralConvertible conforming class and then using the convertible bit uses the superclass initializer, even when the subclass type is specified explicitly.

% xcrun -sdk macosx swiftc ./subclass-float-literal.swift 
% ./subclass-float-literal
b1 className = B
b1 = B
b2 className = A
assertion failed: Must be subclassed: file ./subclass-float-literal.swift, line 23

tjw

import Foundation

@objc protocol MeasurementUnit {
  // If we have one of this unit, how many millimeters is it?
  class var asMillimeters: Double { get }
  var value: Double { get }
    
  init(_:Double)
}

tjw

public protocol MeasurementUnit {
  // If we have one of this unit, how many millimeters is it?
  class var asMillimeters: Double { get }
}

public class Millimeter : MeasurementUnit {
  public class var asMillimeters: Double {
    get {
      return 1.0

tjw

public protocol MeasurementUnit {
    // If we have one of this unit, how many millimeters is it?
    class var asMillimeters: Double { get }
}
public class Inch : MeasurementUnit {
    public class var asMillimeters: Double {
	get {
            return 25.4
	}
    }

tjw

    convenience public init?(url:NSURL, error:NSErrorPointer) {
        if let data = NSData(contentsOfURL:url, options: NSDataReadingOptions(0), error: error) {
            self.init(data:data)
        } else {
            return nil;
        }
    }

--> all stored properties of a class instance must be initialized before returning nil from an initializer

tjw

/*

xcrun swiftc -c switch-enum-struct-case.swift

switch-enum-struct-case.swift:30:36: error: '(size: Size)' does not have a member named 'width'
                  println("rectangle with size \(size.width)x\(size.height)")
                                                 ^    ~~~~~

*/
struct Size {

tjw

#import <Foundation/Foundation.h>

#include <sys/stat.h>

/*
clang -Wall -O2 -fobjc-arc directory-url-unencoded.m -o directory-url-unencoded -framework Foundation
*/

int main(int argc, char *argv[])
{