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OS X - Development and Darwin Discussion and questions about development for Mac OS X.

Crash using block stored in mutable dictionary

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Member Since: Aug 27, 2011
Posts: 8
tron_thomas is on a distinguished road

tron_thomas is offline
What can people tell me about why this program crashes?

#import <Foundation/Foundation.h>

@interface Action : NSObject 
+ (void)execute;

@implementation Action
+ (void)execute
	NSLog(@"The action was executed.");

@interface ActionPerformer : NSObject {
	NSMutableDictionary* _namedActions;

+ (ActionPerformer*) performer;
- (void)addAction:(NSString*)action withClass:(Class)class andSelector:(SEL)selector;
- (void)performAction:(NSString*)action;

@implementation ActionPerformer

typedef void(^ActionBlock)();

+ (ActionPerformer*) performer
	ActionPerformer* performer = [[ActionPerformer alloc] init];
	performer->_namedActions = [NSMutableDictionary dictionary];
	return performer;

- (void)addAction:(NSString *)action withClass:(Class)class andSelector:(SEL)selector
	ActionBlock block = ^() { [class performSelector:selector]; };
	// Verify things work
	[_namedActions setObject:block forKey:action];

- (void)performAction:(NSString *)action
	ActionBlock block = [_namedActions objectForKey:action];
	// Crash happens here!!!


int main()
	@autoreleasepool {
		ActionPerformer* performer = [ActionPerformer performer];
		[performer addAction:@"action" withClass:[Action class]
		[performer performAction:@"action"];	    
    return 0;
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