On 2009-08-30 17:34:36 -0400, Walter Bright <[email protected]> said:
http://www.reddit.com/r/programming/comments/9fk6g/how_nested_functions_work_part_1/
It's
true that C doesn't have nested functions, but Apple's version of C,
C++ and Objective-C, starting with Snow Leopard, has it. Well, it has
nested function litterals, called blocks.
And it's really nice for performing tasks in the background. The
following example is an Objective-C method that adds a task to the
system's global task queue, which upon completion adds a task to the
application's main thread event loop to updates the user interface.
- (IBAction)analyzeDocument:(NSButton *)sender
{
dispatch_async(dispatch_get_global_queue(0, 0), ^{
NSDictionary *stats = [myDoc analyze];
dispatch_async(dispatch_get_main_queue(), ^{
[myModel setDict:stats];
[myStatsView setNeedsDisplay:YES];
[stats release];
});
});
}
Source: Mac OS X 10.6 Snow Leopard Review, Ars Technica
--
Michel Fortin
[email protected]
http://michelf.com/
