q-lang-users

[q-lang-users] Request to know about using Q in C++ programs

[Borse, G. <gan...@cr...>]

Dear Sir,
I am impressed with the great feature of dynamic expression evaluation provided by Q language.

I would like to use this for a C++ application which takes dynamic expressions like queries from database

However, I want to do this in the same process & not over the other process.

In the topic "C.4 Embedding Q in C/C++ Applications " on web page "http://q-lang.sourceforge.net/qdoc/qdoc_15.html#SEC187 <http://q-lang.sourceforge.net/qdoc/qdoc_15.html#SEC187> ", it mentioned that before calling any eval functions from Q library, we need to do qexecv() or qexecl().

Does this mean that we create / fork a process from the parent C/ C++ program & then the script gets loaded into that new process?
Please advise.

Many thanks for your help.

Warm Regards,
Ganesh

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Re: [q-lang-users] Request to know about using Q in C++ programs

[John C. <co...@cc...>]

Borse, Ganesh scripsit:

> In the topic "C.4 Embedding Q in C/C++ Applications " on web
> page "http://q-lang.sourceforge.net/qdoc/qdoc_15.html#SEC187
> <http://q-lang.sourceforge.net/qdoc/qdoc_15.html#SEC187> ", it mentioned
> that before calling any eval functions from Q library, we need to do
> qexecv() or qexecl().
> 
> Does this mean that we create / fork a process from the parent C/ C++
> program & then the script gets loaded into that new process?

Not at all.  qexecv() and qexecl() cause the Q interpreter to load a
script to be run by the interpreter in the current process.  They do not
cause an underlying execv() or execl(), but are only generally analogous
to them (start new script, pass arguments).

-- 
Even the best of friends cannot                 John Cowan
attend each others' funeral.                    co...@cc...
        --Kehlog Albran, The Profit             http://www.ccil.org/~cowan