Queues and Extension methods

[DelphiGuy]

i'm trying to compile the following code under Win 7 monodevelop:

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myQueueInstance.dequeue
myQueueInstance.elementAt(2)


MD is fine with compiling and running the dequeue line, but never heard of "elementAt".

i see that "elementAt" is an "extension method": http://msdn.microsoft.com/en-us/library/7977ey2c.aspx

if my problem is syntax, then what syntax shall i use in order to call an extension method, please?

[DelphiGuy]

from: http://msdn.microsoft.com/en-us/library/bb299233.aspx

Namespace: System.Linq
Assembly: System.Core (in System.Core.dll)

so i added

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use System.Linq

to my code, because i couldn't remember offhand if that's provided as a default in cobra.

then i made a checkmark next to MD's "references" >> "edit references" >> "all" >> "System.Core"

this resulted in the dreaded "cobra internal error" when i tried to rebuild:

error: cobra internal error / win32 exception / the system cannot find the file specified

[nerdzero]

See here: viewtopic.php?f=4&t=1065&p=5429

As for the reference to System.Core, one is implicitly put in there for you by the MD addin when you compile so certain classes like HashSet<of T> can be resolved. I'll try and reproduce the bug and see if the root cause is from the addin or from the compiler.

[DelphiGuy]

ok, thanks for the heads up. there's so much to learn about .net and cobra!

let me know if you need any further code from me in order to replicate.

[nerdzero]

Okay, well the System.Core reference issue has to do with trying to use the "-pkg" compiler option on Windows. The Cobra compiler tries to execute the "pkg-config" command which typically doesn't exist on Windows (expect maybe with a CygWin installation) so it dies with the message: "the system cannot find the file specified"; which is referring to the pkg-config command itself as opposed to any referenced assemblies.

This can be reproduced from the command line with any Cobra source file by executing

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cobra -pkg:foo <source_filename>

I think the MonoDevelop addin has enough information to try and detect a package reference on Windows/.NET and provide a better error message, or possibly find the actual assemblies contained in the package and instead pass in one or more "-ref" options to the compiler which means everything would work. I'll open a bug report on GitHub. Thanks, DelphiGuy.

Charles, not sure if you want the compiler to provide a more descriptive error message or check to see .isRunningOnMono before trying to execute pkg-config. If so, I can open a ticket. I would guess the place to change is somehwhere around here: http://cobra-language.com/trac/cobra/br ... cobra#L714

[nerdzero]

The MonoDevelop addin now correctly supports package references. Muchas gracias for bringing the bug to my attention.