C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Parser library for input of function (object)          C++Talk.NET Forum Index -> C++ Language (Moderated) View previous topic :: View next topic   Author Message Michael Hopkins Guest Posted: Wed Oct 26, 2005 1:16 pm    Post subject: Parser library for input of function (object) Hi all I am looking around to find a C++ library that will allow me to load the definition of a function from a file and turn this into a callable function or functor for use within an already compiled program. The function signature would almost always be of the form: double function( double* x ) As an example, for the Cauchy density function: 1.0/( pi * ( 1.0 + x^2 )) ....the file could contain something like: 1 # the number of independent variables - might make things easier 1.0 / ( PI * ( 1.0 + SQR( _x1 ) ) ) Thanks in advance for any ideas or pointers and feel free to CC replies to this email Michael _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/ _/ _/ _/_/_/ Hopkins Research Ltd _/ _/ _/ _/ _/_/_/_/ _/_/_/ http://www.hopkins-research.com/ _/ _/ _/ _/ _/ _/ _/ _/ 'touch the future' _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/ [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Valentin Samko Guest Posted: Wed Oct 26, 2005 11:16 pm    Post subject: Re: Parser library for input of function (object) Michael Hopkins wrote: Quote: Hi all I am looking around to find a C++ library that will allow me to load the definition of a function from a file and turn this into a callable function or functor for use within an already compiled program. The function signature would almost always be of the form: Try http://warp.povusers.org/FunctionParser/ . -- Valentin Samko - http://val.samko.info [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Tony Delroy Guest Posted: Thu Oct 27, 2005 11:14 am    Post subject: Re: Parser library for input of function (object) Hi Michael, Valentin's suggestion seems by far the best, but if you encounter problems or need more power you could consider either CINT (see http://root.cern.ch/root/Cint.html) , or (probably only practical if your app is for a few in-house users) actually calling the C++ compiler from your program, and dynamically linking the library/ies it produces. Cheers, Tony [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top mlybbert Guest Posted: Thu Oct 27, 2005 2:55 pm    Post subject: Re: Parser library for input of function (object) /* I am looking around to find a C++ library that will allow me to load the definition of a function from a file and turn this into a callable function or functor for use within an already compiled program. */ You're probably not going to find what you want in C++. You may consider Lua ([url]www.lua.org)[/url], Perl ([url]www.perl.com)[/url], Python ([url]www.python.org)[/url], TOOL ([url]www.codeproject.com/tools/ToolPublic.asp)[/url], or another interpreted language. Otherwise, you'll be looking at getting a parser, such as Boost.Spirit (www.boost.org/libs/spirit/) or YARD (www.ootl.org/yard/) to read the file, and then you'd roll your own virtual machine -- effectively making an interpreted language. My suggestion, btw, is Lua. [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Roland Pibinger Guest Posted: Fri Oct 28, 2005 9:03 am    Post subject: Re: Parser library for input of function (object) On 26 Oct 2005 09:16:34 -0400, Michael Hopkins <michael.hopkins (AT) hopkins-research (DOT) com> wrote: Quote: I am looking around to find a C++ library that will allow me to load the definition of a function from a file and turn this into a callable function or functor for use within an already compiled program. The function signature would almost always be of the form: double function( double* x ) Maybe this? http://www.codeproject.com/cpp/FastMathParser.asp Best wishes, Roland Pibinger [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. 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