Re: [Haskell-cafe] Help me TH code.

Unless you have a 'real' type for parse sometime during compile time, TH won't be able to generate it. A good rule of thumbs is that if you can't write the code yourself, then you can't get TH to do it either. /J On 27 October 2010 08:50, Andy Stewart wrote:

Serguey Zefirov writes:

...

2010/10/27 Andy Stewart :

...

Hi all,

I want use TH write some function like below:

data DataType = StringT | IntT | CharT

parse :: [(String,DataType)] -> (TypeA, TypeB, ... TypeN)

Example:

parse [("string", StringT), ("001", IntT), ("c", CharT)]

will return:

("string", 001, 'c')

So how to use TH write 'parse' function?

I think that you should use TH properly, without compiler and logical errors.

What actually do you want? I'm build multi-processes communication program.

Example i have two processes : Client and Server.

At Client side, i pass [DataType] to Server, example:

[StringT, IntT, CharT]

Server will handle "user input" with [DataType] and return result [String] to Client side, example:

["string", "001", "c"]

Then at Client side, i need parse [String] to get real value:

("string", 001, 'c')

Because, [DataType] have many different case, so i want pass [String] between processes, and use TH parse result [String] at Client side.

Thanks,

-- Andy _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe