Re: [CINT] Re: Embedding CINT in C++ application

Hi,

you could write it to a temporary file. If you call it e.g. "tempAHGHJGJ.C" and wrap your code in a function "tempAHGHJGJ()" you can simply do gInterpreter->ProcessLine(".x tempAHGHJGJ.C"). This file will be run with bytecode optimization.

Cheers, Axel.

Borse, Ganesh wrote:
> ProcessLine would be slower because every call to ProcessLine will parse the expression & then execute it.
>
> Is it possible to do the onetime parsing (& compile) of such expression & then execute that byte code later multiple times?
>
> E.g. I wrap this expression in a function like below:
>
> const char *myFuncSrc=\
> "int MyFunction(int size, int vol, int ADV,char* prod, char* ordClient)\
> {\
> if((size < 1000) && (vol < (0.001 * ADV)) && (prod == "Stock") && strstr("ABCD,EFGH,HIJK,NEWONE,song,JUNK,DONE",ordClient))\
> return 1;\
> else\
> return 0;\
> }"
> // Parse & Compile this function
> gInterpreter->ProcessLine(myFuncSrc);
> while(1){
> // --- data for variables come in from client application over a socket connection
> char* argv[]=; // populate the input arguments....
> Int result=0;
> gInterpreter->Execute("MyFunction",argv,&result);
> printf("result %d\n",result);
> }
>
> How do we do this kind of actions with Tinterpreter or other APIs of cint?
> Sorry for long list of questions.
>
> Thanks & Regards,
> Ganesh
> -----Original Message-----
> From: Axel Naumann [mailto:Axel.Naumann_at_cern.ch]
> Sent: 05 December 2007 17:09
> To: Rene Brun
> Cc: Borse, Ganesh; roottalk_at_root.cern.ch; 'cint_at_root.cern.ch'
> Subject: Re: [CINT] Re: [ROOT] Embedding CINT in C++ application
>
> ...or, for more of C++ including variable declaration etc, pass your C++ code as a string to ROOT's gInterpreter>ProcessLine(). gInterpreter is ROOT's global TCint object; a high level interface to CINT. See <http://root.cern.ch/root/html/TCint#TCint:ProcessLine> If you weant to do the same with CINT stand-alone then please let us know.
>
> Cheers, Axel.
>
> Rene Brun wrote:

>> ROOT provides two classes (TFormula and TTreeFormula) for doing 
>> exactly what you want to do.
>> see examples of use with ROOT Trees in the Users Guide
>>   ftp://root.cern.ch/root/doc/12Trees.pdf
>> at section "Simple Analysis using Trees" at page 213 and following
>>
>> Rene Brun
>>
>> Borse, Ganesh wrote:
>>> Hi,
>>> Is it possible to embed ROOT CINT in C++ application & use it for 
>>> doing dynamic expressions parsing, compilation and then multiple run 
>>> time evaluations those expressions?
>>>
>>> I can see the root/bin/cint has all its logic in root/lib/libCint.so, 
>>> with ldd command.
>>>
>>> E.g, I have the expressions as below:
>>> ((size < 1000) && (vol < (0.001 * ADV)) && (prod == "Stock") &&
>>> strstr("ABCD,EFGH,HIJK,NEWONE,song,JUNK,DONE",ordClient))
>>>
>>> The variables size, ADV, vol, etc. will be changing at runtime.
>>> So, I would like to create function which will take these variables 
>>> as input arguments & return the result of evaluated expression.
>>>
>>> Since, these expressions, the number & type of these variables is not 
>>> at compilation time, I cannot create & compile these function at 
>>> compiling my application.
>>>
>>> Hence, I need to use some kind of interpreter which can take these 
>>> expressions, etc as source code & compile them.
>>>
>>> I tried to use Python & Perl interpreters for embedding them in C++ 
>>> application. But they don't provide the required performance level.
>>>
>>> Also, the syntax of the expressions is to be same that in these 
>>> scripting languages. Hence, it is little tedious to use them.
>>>
>>> May you please guide me, if I can use cint for this?
>>> What are the functions, APIs & include headers, etc. I need to use 
>>> for this?
>>>
>>> A sample program of the same thing which I am doing with Cpython API 
>>> (embedding Python in C) is attached here.
>>>
>>> Thanks and Regards,
>>> Ganesh
>>> <<testeval.cpp>>
>>>
>>> =====================================================================
>>> =========
>>>
>>> Please access the attached hyperlink for an important electronic 
>>> communications disclaimer:
>>> http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html
>>> =====================================================================
>>> =========
>>>
>>>   
>>