Add a tryUnbox, isNull builtin operators

[baronfel]

Add a tryUnbox, isNull builtin operators [6099437]

Submitted by Dave Thomas on 6/25/2014 12:00:00 AM
15 votes on UserVoice prior to migration

Add builtin functions:
tryUnbox : obj -> 'T option
isNull: 'T -> bool when 'T : null
The first is an unbox operation which if successful would return Some<'a> on a successful unbox and None for a fail. This would allow the Option module to be used efficiently for single type matches and processing.

Response

** by fslang-admin on 1/21/2015 12:00:00 AM **

Completed for F# 4.0, see https://visualfsharp.codeplex.com/SourceControl/network/forks/dsyme/cleanup/contribution/7672
Don Syme, F# Language/Library Evolution

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