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How to control c++ object externally, at runtime

Posted on 2010-09-18
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Last Modified: 2012-05-10
The title does not say enough. I have a program written in c++ that contains commands available to the user at run time. I'd like to allow the user to execute whatever command they want to by typing in the command. An example will make this clearer.
If I have a program that has a class A

class A
{
public:
    int Add(short a, short b) { return a+b;}
}

And the program creates the object TestA
A* TestA=new A;

I want to know:  is there a way for the user, at run time, to type in

TestA->Add(3,7)   and have it execute the actual object/function?

Obviously, the actual code is a lot more complex than this example, but I hope this makes it clearer.

Thanks, Brian

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Question by:BrianDumas
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evilrix earned 500 total points
ID: 33709113
This is perfectly possible but not in a way where you can execute on the fly what they enter. You would have to decide before hand what operations your were prepared to support. You would need to parse whatever is typed into the command line, figure out what command or operation the user wishes to execute and then run it. Writing a parser can be a tricky thing but if you don't mind getting your hands dirty with a DSL (Domain Specific Language) I can highly recommend the Spirit parser that is part of Boost.

http://en.wikipedia.org/wiki/Spirit_Parser_Framework
http://boost-spirit.com/home/
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