Hi,

On Sat, Jul 19, 2008 at 3:13 PM, Joel de Guzman <joel@boost-consulting.com> wrote:

Zeljko Vrba wrote:

On Fri, Jul 18, 2008 at 10:17:28PM +0200, Istvan Buki wrote:

Steven,

your solution is exactly what I needed.
My only dream is to be able to manipulate these concepts as well as you do.

Just out of curiosity -- could you please describe your real underlying
problem that made you turn to fusion? The fusion manual is severely
lacking in motivation, esp. when it comes to transformations, so any

What do you mean by transformations?

examples from the real world are welcome.

Or, to reformulate the question: which imminent problem at hand do you have
and what is the advantage of solving it by fusion instead of by "traditional"
means?

Again, please define "traditional means".

Thank you.

(PS: I have some experience with functional languages such as ML and I *do*
know what *tuples* are useful for.. but the rest? [and the 'rest' does not
even cover ML-style pattern matching])

What is "rest" and why should fusion cover ML-style pattern matching?

Anyway...

If anyone can suggest a motivating example and how to improve the
docs, I'd appreciate it a lot.

I do not know for sure if what I'm working on is a good example for using fusion.
It started as an experiment to learn more about some of the boost libraries.
The application is a very small ETL tool which allows me to load and save data from CSV files or database tables. Each record is represented by a fusion map. Between the load and save components I can insert all kind of filters to transform the data contained in the map.

The question I asked the other day was more specifically related to the database component that is using the SOCI library which is making use of fusion vectors to represent the rows of a table. I needed a way to copy the data contained in a fusion map into a fusion vector before storing it into the database.

One of the next component I will probably develop is a something to load XML messages from a file.
I'm not yet decided how I'll represent the XML data in the application. I saw that there is a fusion tree in the ext directory but I'm not sure how stable it is. Steven already helped me a while ago to understand how to work with nested fusion maps. If you have suggestions regarding this subject I would like to hear them.

I hope this can help you.

Istvan Buki