C++ and dynamic programming

**John Carson** · Jul 22 '05, 05:19 AM

Re: C++ and dynamic programming

"The Directive" <the_directive@ hotmail.com> wrote in message
news:8477bc58.0 401162120.12f49 515@posting.goo gle.com[color=blue]
> Does C++ support dynamic programming? I hope I'm using the correct
> term. I want to write code that can dynamically rewrite itself! I want
> to dynamically create functions and call them and etc. If not, are
> there any plans to add support for it in the future? What other
> popular programming languages support dynamic programming? [Email me
> privately for the last question so that people will not complain that
> it's out of context.]
>[/color]

If you mean does C++ allow you to generate functions on the fly that are
identical to those produced at compile time, then the answer is no. C++ can,
however, be used to create an interpreter, i.e., a program that will allow
you to type in functions at runtime and will store and execute those
functions. Writing such a program involves some work, however (how much work
depends on the range of possible functions you wish to support).

Any function that you might write will be built up from basic operations
(built in operators like + as well as predefined functions like sin and
cos). Accordingly, an interpreter basically consists of a pre-written
all-purpose function that calls basic operations as needed by the function
that the user specifies at run-time (in the simplest case, it may involve a
switch statement that executes different operations depending on which
operation has been specified at run-time). For a simple illustration of how
this is done, look at the calculator program in Ch 6 (including exercise 20)
of Stroustrup's TC++PL.

--
John Carson
1. To reply to email address, remove donald
2. Don't reply to email address (post here instead)

**Sharad Kala** · Jul 22 '05, 05:19 AM

Re: C++ and dynamic programming

"John Carson" <donaldquixote@ datafast.net.au > wrote in message
news:4008d9b5$1 @usenet.per.par adox.net.au...[color=blue]
> "The Directive" <the_directive@ hotmail.com> wrote in message
> news:8477bc58.0 401162120.12f49 515@posting.goo gle.com[color=green]
> > Does C++ support dynamic programming? I hope I'm using the correct
> > term. I want to write code that can dynamically rewrite itself! I want
> > to dynamically create functions and call them and etc. If not, are
> > there any plans to add support for it in the future? What other
> > popular programming languages support dynamic programming? [Email me
> > privately for the last question so that people will not complain that
> > it's out of context.]
> >[/color]
>
> If you mean does C++ allow you to generate functions on the fly that are
> identical to those produced at compile time, then the answer is no. C++ can,
> however, be used to create an interpreter, i.e., a program that will allow
> you to type in functions at runtime and will store and execute those
> functions. Writing such a program involves some work, however (how much work
> depends on the range of possible functions you wish to support).
>[/color]

Well , C++ can generate class hierarchies on the fly.
That means you can make the compiler generate it for you.
This involves using templates.
Take a look at Andrei Alexandrescu's "Modern C++ design" where he shows in
chapter 4 how to
generate linear and scattered class hierarchies at compile time.

Best wishes,
Sharad

**Jacques Labuschagne** · Jul 22 '05, 05:19 AM

Re: C++ and dynamic programming

Sharad Kala wrote:[color=blue]
> Take a look at Andrei Alexandrescu's "Modern C++ design" where he shows in
> chapter 4 how to
> generate linear and scattered class hierarchies at compile time.[/color]
^^^^^^^^^^^^^^^
"Compile time" may or may not meet your definition of dynamic
programming, because it involves a compile/execute/modify-source loop.
It doesn't happen on what most people consider to be "the fly".

Jacques.

**Sharad Kala** · Jul 22 '05, 05:26 AM

Re: C++ and dynamic programming

"Jacques Labuschagne" <jacques@clawsh rimp.com> wrote in message
news:ss5Ob.1765 9$ws.2125216@ne ws02.tsnz.net.. .[color=blue]
> Sharad Kala wrote:[color=green]
> > Take a look at Andrei Alexandrescu's "Modern C++ design" where he shows in
> > chapter 4 how to
> > generate linear and scattered class hierarchies at compile time.[/color]
> ^^^^^^^^^^^^^^^
> "Compile time" may or may not meet your definition of dynamic
> programming, because it involves a compile/execute/modify-source loop.
> It doesn't happen on what most people consider to be "the fly".[/color]

Yes..actually I do agree with you that it isn't exactly what people would say
dynamic programming.
In fact it uses static polymorphism.
My point was that you can make C++ to write code for you. This is unlike virtual
functions where the branch of execution to be selected
is dynamic, but the code for execution has already been hand-written by someone.

Best wishes,
Sharad

**peter** · Jul 22 '05, 05:32 AM

Re: C++ and dynamic programming

The Directive wrote:[color=blue]
> Does C++ support dynamic programming? I hope I'm using the correct
> term. I want to write code that can dynamically rewrite itself! I want
> to dynamically create functions and call them and etc. If not, are
> there any plans to add support for it in the future? What other
> popular programming languages support dynamic programming? [Email me[/color]

your problem might be resolved using embeddable C/C++ interpreter Ch. It
allows you to generate C/C++ code source code/functions on the fly and
be called by your C/C++ binary application, or call back your binary
C/C++ functions.

you can take a look at
http://www.softintegra tion.com/solution/embedded/
http://www.softintegra tion.com/products/sdk/embedded_ch/

[color=blue]
> privately for the last question so that people will not complain that
> it's out of context.]
>
> --The Directive[/color]

C++ and dynamic programming

C++ and dynamic programming

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