Re: [Seqan-dev] newbie question

["Holtgrewe, Manuel" <manuel.holtgrewe@fu-berlin.de>]

Bernd,

You have just discovered tag-based dispatch. Actually, Fasta and Fastq are types in the seqan namespace.

When using a class name as an expression (as you are in the readRecord() function call, using "KlassName()" creates a new object. Now, there are various different template functions with the same name and slightly different signatures, similar to:

template <typename TString> int readRecord(TString & target, Fasta const &) { ... }
template <typename TStrng> int readRecord(TString & target, Fastq const &) { ... }

When you use the tag Fasta() then the first overload is used, with Fastq() the second one is used.

I assume that you could solve the original question from your other email.

Cheers, HTH!
Manuel

-----Original Message-----
From: Bernd Jagla [mailto:bernd.jagla@pasteur.fr] 
Sent: Mittwoch, 7. März 2012 11:35
To: seqan-dev@lists.fu-berlin.de
Subject: [Seqan-dev] newbie question

Hi,

I am not very familiar with C++, nor templates etc so sorry for my ignorance...

Since I am not using Eclipse at the moment I am relying on the trac pages and tutorials to give me the information I am looking for. 
Unfortunately this is not working as expected.

I would like to write a simple record reader for a fastq file. There is an example for a fasta file and it shouldn't be that difficult to translate this into a fastq reader. But when I search for fastq in the track pages (http://docs.seqan.de/seqan/dev/) I don't get any results. I can't even find function Fasta() that is mentioned in the tutorial (http://trac.seqan.de/wiki/Tutorial/ReadingSequenceFiles)...

Could you please enlighten me on what I am doing wrong?

Thanks a lot,

Bernd


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