How to read fastly files ( I/O operation)

[monarch_dodra]

On Thursday, 7 February 2013 at 14:30:11 UTC, bioinfornatics 
wrote:
> Little feed back
> i named f the f's script and monarch the monarch's script
>
>  gdmd -O -w -release f.d
> ~ $ time ./f bigFastq.fastq
> ['T':999786820, 'A':1007129068, 'N':39413, 'C':1350576504, 
> 'G':1353023772]
>
> real	2m14.966s
> user	0m47.168s
> sys	0m15.379s
> ~ $ gdmd -O -w -release monarch.d
> monarch.d:117: no identifier for declarator Lines
> monarch.d:117: alias cannot have initializer
> monarch.d:130: identifier or integer expected, not assert
>
>
> i haven't take the time to look more
>
> but in any case it seem memory mapped file is really slowly 
> whereas it is said that is the faster way to read file. Create 
> an index where reading the file need 12 min that is useless as 
> for read and compute you need 2 min

You must be using dmd 2.060. I'm using some 2.061 features: 
Namelly "new style alias".

Just change line 117:
alias Lines = typeof(File.init.byLine());
to
alias typeof(File.init.byLine()) Lines;

As for 130, it's a "version(assert)" eg, code that does not get 
executed in release. Just remove the "version(assert)", if it 
gets executed, it is not a big deal.

In any case, I think the code is mostly "proof", I wouldn't use 
it as is.

------------

BTW, I've started working on my library. How would users expect 
the "quality" format served? As an array of characters, or as an 
array of integrals (ubytes)?