Re: Embedding CINT in C++ application

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>>
>
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Received on Wed Dec 05 2007 - 08:22:41 CET