Bug 28046 - NSArray bindings nint vs. nuint
Summary: NSArray bindings nint vs. nuint
Status: RESOLVED ANSWERED
Alias: None
Product: iOS
Classification: Xamarin
Component: XI runtime ()
Version: XI 8.8.0
Hardware: Macintosh Mac OS
: Normal normal
Target Milestone: Untriaged
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2015-03-15 12:17 UTC by Neal
Modified: 2015-03-16 10:19 UTC (History)
3 users (show)

Tags:
Is this bug a regression?: ---
Last known good build:

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Status:
RESOLVED ANSWERED

Description Neal 2015-03-15 12:17:44 UTC
Hello,

I'm trying to track down some CoreData issues and I'm looking at the NSArray we are expecting such as a count.  I'm looking at the Assembly browser for NSArray and I am seeing mixed use of nint and nuint where I think the nint's should in fact be nuint - can you please review/verify?

Thank you.


internal static NSArray FromNativeObjects (INativeObject[] items, nint count);

		[Export ("arrayWithObjects:count:"), CompilerGenerated]
		internal static NSArray FromObjects (IntPtr array, nint count);

https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSArray_Class/#//apple_ref/occ/clm/NSArray/arrayWithObjects:count:
Comment 1 Udham Singh 2015-03-16 06:28:01 UTC
I have checked this issue and observed the reported behaviour. Please refer the screencast : http://www.screencast.com/t/EPfIizGL

Environment Info : 

=== Xamarin Studio ===

Version 5.9 (build 218)
Installation UUID: ce927b2a-2c07-44c5-b186-09cfdafba6dc
Runtime:
	Mono 4.0.0 ((detached/565c18b)
	GTK+ 2.24.23 (Raleigh theme)

	Package version: 400000068

=== Apple Developer Tools ===

Xcode 6.2 (6776)
Build 6C131e

=== Xamarin.iOS ===

Version: 8.10.0.90 (Business Edition)
Hash: 01afb49
Branch: master
Build date: 2015-03-15 01:52:46-0400

=== Build Information ===

Release ID: 509000218
Git revision: 908c39cbafdaf712059565e80591c06830fdf590
Build date: 2015-03-13 15:05:04-04
Xamarin addins: a87d89e3612e207fe3ccc142b1c2a2eb0deff730

=== Operating System ===

Mac OS X 10.9.5
Darwin Xamarin76s-Mac-mini.local 13.4.0 Darwin Kernel Version 13.4.0
    Sun Aug 17 19:50:11 PDT 2014
    root:xnu-2422.115.4~1/RELEASE_X86_64 x86_64
Comment 2 Sebastien Pouliot 2015-03-16 10:17:29 UTC
Yes, it should have been.

There are some (mostly legacy) cases where it was decided to use `int` over `uint` in the public API. The main reasons are that `int` is normally used by .NET (and it avoid a lot of casting) and `uint` is not CLS compliant.

Note that this does not affect the use of the API unless you have more than 2^31 items (on a 32bits app). In this case you'll run out of memory before this condition can happen.
Comment 3 Neal 2015-03-16 10:19:50 UTC
Thanks Sebastian, we are trying to pin down why we're having major CoreData issues with ARM64/unified as per http://forums.xamarin.com/discussion/35802/coredata-and-arm64-unified-instability and this is one area we've seen issues with some fetches.