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RE: Memory Management: Revamped Engine Example
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RE: Memory Management: Revamped Engine Example


  • Subject: RE: Memory Management: Revamped Engine Example
  • From: Jordan Evans <email@hidden>
  • Date: Sat, 31 Dec 2005 18:31:05 -0800 (PST)

I think this engine is getting close to being a fine
runner. But I'm not sure if it's tip-top yet.

To recap: The -maintenance method must cause replaced
parts to be deallocated. The only way I've figured
out how to do this is with the field data:
enginePartsPtr. I'm not sure if I over complicated
things. If there is a better way to do this, I would
appreciate any input.

I attached the XCode source code .m file also.

#import <Foundation/Foundation.h>

//Filler Classes for Engine Class
@interface CombustionChamber : NSObject{} @end
@implementation CombustionChamber @end

@interface Compressor : NSObject{} @end
@implementation Compressor @end

@interface FuelInjector : NSObject{} @end
@implementation FuelInjector @end

@interface Shaft : NSObject{} @end
@implementation Shaft @end

@interface Turbine : NSObject{} @end
@implementation Turbine @end

@interface Engine : NSObject
{
NSMutableArray *engineParts;
id *enginePartsPtr;
}

- (id)init;
- (void)maintenance:(NSArray*)badParts;

@end


@implementation Engine

- (id)init;
{
int i;

[super init];

engineParts = [[NSMutableArray alloc] init];

//Here are the parts for this engine. I have added
two Fuel Injectors.
[engineParts addObject:[[CombustionChamber alloc]
init]];
[engineParts addObject:[[Compressor alloc] init]];
[engineParts addObject:[[FuelInjector alloc] init]];
[engineParts addObject:[[FuelInjector alloc] init]];
[engineParts addObject:[[Shaft alloc] init]];
[engineParts addObject:[[Turbine alloc] init]];

enginePartsPtr = (id
*)(malloc(sizeof(id)*[engineParts count]));

for( i=0; i<[engineParts count]; i++ )
enginePartsPtr[i] = [engineParts objectAtIndex:i];

return self;
}

- (void)dealloc;
{
[engineParts release];

[super dealloc];
}

- (void)maintenance:(NSArray*)badParts
{
int i, part;

id PartClass;

NSLog(@"Parts before maintenance:\n");
for(i=0; i<[engineParts count]; i++)
NSLog(@"Part%i: %@", i, [[engineParts
objectAtIndex:i] description]);

for( i=0; i<[badParts count]; i++ )
{
part = [[badParts objectAtIndex:i] intValue];

PartClass = [[engineParts objectAtIndex:part]
class];

[enginePartsPtr[part] release];

[engineParts replaceObjectAtIndex:[[badParts
objectAtIndex:i] intValue] withObject:[[PartClass
alloc] init]];

enginePartsPtr[part] = [engineParts
objectAtIndex:part];
}

NSLog(@"Parts after maintenance:\n");
for(i=0; i<[engineParts count]; i++)
NSLog(@"Part%i: %@", i, [[engineParts
objectAtIndex:i] description]);

printf("\n");
}

@end

int main (int argc, const char *argv[])
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc]
init];

Engine *myEngine = [[[Engine alloc] init]
autorelease];

NSArray *badParts1 = [NSArray arrayWithObjects:
[NSNumber numberWithInt:0], [NSNumber
numberWithInt:1], nil ];

NSArray *badParts2 = [NSArray arrayWithObjects:
[NSNumber numberWithInt:5], nil ];

[myEngine maintenance:badParts1];
[myEngine maintenance:badParts2];

[pool release];

return 0;
}




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Attachment: MemoryEngine.m
Description: 1471405315-MemoryEngine.m

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