[
https://issues.apache.org/jira/browse/TINKERPOP-1854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16399217#comment-16399217
]
ASF GitHub Bot commented on TINKERPOP-1854:
-------------------------------------------
Github user FlorianHockmann commented on the issue:
https://github.com/apache/tinkerpop/pull/792
I just rebased on `tp32` and hopefully also addressed your suggestions.
`Lambda` now implements a bunch of interfaces that mirror the Java functional
interfaces from the traversal API:
```cs
public class Lambda : IFunction, IBiFunction, IPredicate, IUnaryOperator,
IBinaryOperator,
IComparator, IConsumer, ISupplier
```
This should make it easier for users to see where lambdas can be used. I
also added a short note to the documentation about these interfaces for lambdas.
With all these new interfaces there is now just one Java type left for
which we don't have a .NET equivalent: `VertexProgram`. So the next release
will again increase type-safety of the traversal API a lot.
We are now down to just 5 ignored scenarios for `tp32` 🎉
@jorgebay, you linked the Java `Lambda` interface in one of your comments.
The same file also contains classes like `TwoArgLambda` that are very similar
to the `Lambda` class I implemented in this PR, but they use [different methods
for the different
interfaces](https://github.com/apache/tinkerpop/blob/3.2.7/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/util/function/Lambda.java#L158)
like:
```java
public static <A> Consumer<A> consumer(final String lambdaSource,
final String lambdaLanguage)
```
Do we also want to have similar methods in Gremlin.Net? It would be very
easy to implement and I can image that just having a `Lambda` object could lead
to some confusion as to where it can be used.
> Support lambdas in Gremlin.Net
> ------------------------------
>
> Key: TINKERPOP-1854
> URL: https://issues.apache.org/jira/browse/TINKERPOP-1854
> Project: TinkerPop
> Issue Type: Improvement
> Components: dotnet
> Affects Versions: 3.3.0, 3.2.6
> Reporter: Florian Hockmann
> Assignee: Florian Hockmann
> Priority: Major
> Fix For: 3.2.8, 3.3.2
>
>
> Gremlin.Net should support lambdas. We already discussed this in [the pull
> request for TINKERPOP-1752|https://github.com/apache/tinkerpop/pull/712].
> Here is what [~spmallette] said over there:
> {quote}
> Any reason we don't support lambdas? Even if .NET can't support them natively
> for some reason wouldn't we minimally support the ability to pass a
> python/groovy/etc lambda? it's kinda weird that way, but i think back to the
> point that kuppitz made on the dev list the other day where he stated that he
> doesn't always find a way out of using lambdas in production systems he works
> on - so ultimately users will need that kind of capability i think.
> {quote}
> C# lambdas would require some kind of C# parser on the server side, so at
> least in the beginning a way to send lambdas from already supported languages
> in Gremlin.Net should be enough.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
