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copied!<p>OK, I have compiled up the following code at it works as expected.</p> <p><strong>FloatHolder.h</strong></p> <pre><code>@interface FloatHolder : NSObject { int _count; float* _values; } - (id) initWithCount:(int)count; // possibly look into this for making access shorter // http://vgable.com/blog/2009/05/15/concise-nsdictionary-and-nsarray-lookup/ - (float)getValueAtIndex:(int)index; - (void)setValue:(float)value atIndex:(int)index; @property(readonly) int count; @property(readonly) float* values; // allows direct unsafe access to the values @end </code></pre> <p><strong>FloatHolder.m</strong></p> <pre><code>#import "FloatHolder.h" @implementation FloatHolder @synthesize count = _count; @synthesize values = _values; - (id) initWithCount:(int)count { self = [super init]; if (self != nil) { _count = count; _values = malloc(sizeof(float)*count); } return self; } - (void) dealloc { free(_values); [super dealloc]; } - (float)getValueAtIndex:(int)index { if(index<0 || index>=_count) { @throw [NSException exceptionWithName: @"Exception" reason: @"Index out of bounds" userInfo: nil]; } return _values[index]; } - (void)setValue:(float)value atIndex:(int)index { if(index<0 || index>=_count) { @throw [NSException exceptionWithName: @"Exception" reason: @"Index out of bounds" userInfo: nil]; } _values[index] = value; } @end </code></pre> <p>then in your other application code you can do something like the following:</p> <p>** FloatTestCode.h **</p> <pre><code>#import <Cocoa/Cocoa.h> #import "FloatHolder.h" @interface FloatTestCode : NSObject { FloatHolder* holder; } - (void) doIt:(id)sender; @end </code></pre> <p>** FloatTestCode.m **</p> <pre><code>#import "FloatTestCode.h" @implementation FloatTestCode - (id) init { self = [super init]; if (self != nil) { holder = [[[FloatHolder alloc] initWithCount: 10] retain]; } return self; } - (void) dealloc { [holder release]; [super dealloc]; } - (void) doIt:(id)sender { holder.values[1] = 10; } </code></pre>

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