CODEWITHSUNDEEP
linqlambdaexpression-treesboo
user39880
user39880

Reputation:

lambda expression in boo

dose boo understand Expression tree?

I try to compile this line with sharp develop

exp as System.Linq.Expressions.Expression[of Func[of SomeClass, bool]] = { p as Text | return (p.Name == 'tttt') }

but sharp develop raised this error

Cannot convert 'callable(testlinq.SomeClass) as bool' to 'System.Linq.Expressions.Expression[of System.Func[of testlinq.SomeClass, bool]]'. (BCE0022)

Upvotes: 1

Views: 573

Answers (1)

sehe
sehe

Reputation: 392893

Boo has had expression trees longer than C#.

http://ayende.com/blog/3065/meta-methods

[Meta]
static def verify(expr as Expression):
    return [|
        unless $expr:
            raise $(expr.ToCodeString())
    |]

IIRC Boo was designed to allow meta-programming macro's (much like Lisp, Nemerle, and many other functional languages) and has as such allowed full access to the AST of any fragment of Boo code.

Now this is all served from long memory, so I advise you to consult the Boo documentation for up-to-date information.

Upvotes: 1

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