[Click] ANNOUNCE/RFC: Type-safe argument parsing

[Roberto Riggio]

Something is missing:

CXX ../elements/standard/addressinfo.cc
../elements/standard/addressinfo.cc: In member function ‘virtual int 
AddressInfo::configure(Vector<String>&, ErrorHandler*)’:
../elements/standard/addressinfo.cc:97: error: ‘EtherAddressArg’ was not 
declared in this scope


Il 10/05/2011 02:35, Eddie Kohler ha scritto:
> All,
>
> The argument parsing branch is merged!  Thanks for your comments.
>
> Eddie
>
>
> On 04/28/2011 01:26 PM, Eddie Kohler wrote:
>> Hi all,
>>
>> A longstanding Click annoyance is argument parsing, which has been rewritten
>> more than once.
>>
>> There are still problems with the current cp_va_kparse versions.
>>
>> - Type safety: Did you know that this is a serious bug, that the compiler
>> cannot catch?
>>
>> #include<click/confparse.hh>
>> bool b;
>> ...
>> if (cp_va_kparse(conf, this, errh,
>>                 "I_FORGOT_WHAT_B_WAS", cpkP+cpkM, cpInteger,&b,
>>                 cpEnd)<   0)
>>        return -1;
>>
>> - Multithread safety: Did you know that if cp_va_kparse is called in parallel
>> in two threads, the two calls will unsafely collide on a static array of
>> "cp_value" objects?
>>
>> - Multithread safety: Did you know that cp_integer() and friends set a global
>> variable, cp_errno -- and that cp_errno settings can collide across threads?
>>
>> -*-
>>
>> The github "argparse" branch, which will soon be shifted to master, fixes
>> these problems with a new Args class.  Args is much nicer to type and read
>> than cp_va.
>>
>> #include<click/args.hh>
>> bool b;
>> ...
>> if (Args(conf, this, errh)
>>        .read_mp("B", b)
>>        .complete()<   0)
>>        return -1;
>>
>> There are other advantages: it's easier and cleaner to write and refer to new
>> parser types, for example.
>>
>> -*-
>>
>> I am interested in feedback and comments.  Please look and report any
>> problems.  Thanks to Cliff for discussion.
>>
>> Eddie
>> _______________________________________________
>> click mailing list
>> click at amsterdam.lcs.mit.edu
>> https://amsterdam.lcs.mit.edu/mailman/listinfo/click
> _______________________________________________
> click mailing list
> click at amsterdam.lcs.mit.edu
> https://amsterdam.lcs.mit.edu/mailman/listinfo/click


-- 
--------------------------------------------------------
Roberto Riggio, Ph.D.
CREATE-NET
Network&  Security Solutions for Pervasive Computing Systems (iNSPIRE)
Senior Researcher
Via alla Cascata 56/D - 38123 Povo Trento (Italy)
e-mail: roberto.riggio at create-net.org
Tel: (+39) 0461 408400 - interno/extension 708
Fax: (+39) 0461 421157
www.create-net.org/~rriggio
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