Initial data commit

Task/Reflection-List-properties/Objective-C/reflection-list-properties.m

@@ -0,0 +1,56 @@
+#import <Foundation/Foundation.h>
+#import <objc/runtime.h>
+
+@interface Foo : NSObject {
+  int exampleIvar;
+}
+@property (nonatomic) double exampleProperty;
+@end
+@implementation Foo
+- (instancetype)init {
+  self = [super init];
+  if (self) {
+    exampleIvar = 42;
+    _exampleProperty = 3.14;
+  }
+  return self;
+}
+@end
+
+int main() {
+  id obj = [[Foo alloc] init];
+  Class clazz = [obj class];
+
+  NSLog(@"\Instance variables:");
+  unsigned int ivarCount;
+  Ivar *ivars = class_copyIvarList(clazz, &ivarCount);
+  for (unsigned int i = 0; i < ivarCount; i++) {
+    Ivar ivar = ivars[i];
+    const char *name = ivar_getName(ivar);
+    const char *typeEncoding = ivar_getTypeEncoding(ivar);
+    // for simple types we can use Key-Value Coding to access it
+    // but in general we will have to use object_getIvar and cast it to the right type of function
+    // corresponding to the type of the instance variable
+    id value = [obj valueForKey:@(name)];
+    NSLog(@"%s\t%s\t%@", name, typeEncoding, value);
+  }
+  free(ivars);
+
+  NSLog(@"");
+  NSLog(@"Properties:");
+  unsigned int propCount;
+  objc_property_t *properties = class_copyPropertyList([Foo class], &propCount);
+  for (unsigned int i = 0; i < propCount; i++) {
+    objc_property_t p = properties[i];
+    const char *name = property_getName(p);
+    const char *attributes = property_getAttributes(p);
+    // for simple types we can use Key-Value Coding to access it
+    // but in general we will have to use objc_msgSend to call the getter,
+    // casting objc_msgSend to the right type of function corresponding to the type of the getter
+    id value = [obj valueForKey:@(name)];
+    NSLog(@"%s\t%s\t%@", name, attributes, value);
+  }
+  free(properties);
+
+  return 0;
+}