Nice. Very interesting and informative. Thanks, Eric.
-- Mike
----- Original Message -----
> From: Eric Schulte <schulte.e...@gmail.com>
> To: Michael Hannon <jm_han...@yahoo.com>
> Cc: Org-Mode List <emacs-orgmode@gnu.org>
> Sent: Friday, November 18, 2011 11:39 AM
> Subject: Re: [O] Details of compling and running C++ code from Org-mode?
>
> Hi Michael,
>
> Michael Hannon <jm_han...@yahoo.com> writes:
>
>> Greetings. I'm curious about the process of executing a program that
> is
>> compiled from a source block in Org-mode.
>>
>> Some background: I was playing with some C++ code (a slight generalization
> of
>> some code I found in a book). I wanted to use the "assign"
> method to
>> initialize a vector, as:
>>
>> vector<int> testVec(5, 0);
>> testVec.assign({2, 4, 6, 8, 10});
>>
>> It turns out that to do this one has to tell g++ (in my case) to use the
>> latest version of the C++ standard. I discovered that I could do this via:
>>
>> (setq org-babel-C++-compiler "g++ -std=c++0x")
>>
>
> You could also use the :flags header argument (:flags "-std=c++0x") to
> pass this flag to g++.
>
>>
>> This got me to wondering if there were any similar hooks that relate to
>> running the program once it's compiled. I looked through the list of
>> org-babel* variables, but didn't find anything obvious.
>>
>> So what does happen when I hit C-c C-c in, say, a cpp source-code block?
> The
>> contents of the file are evidently written to a temporary file, after which
>> the command specified by org-babel-C++-compiler is run on that file. The
>> results of the compilation are stuck some place -- another temporary file,
> I
>> suppose. Then the second, executable file is run and the results
>> collected.
>
> Thanks for asking this question, and sorry it took so long to respond.
> I've placed an annotated copy of the relevant code up at [1] which
> should explain the evaluation process for c/c++ code. In many cases
> browsing the relevant org-babel-execute:* function for your language is
> the best way to discover what flags are available.
>
>>
>> What command runs the file?
>
> The file itself is called directly.
>
>> Is there any control from Org-mode over this second stage of the
>> process?
>
> Yes, the :cmdline header argument may be used to pass values to the
> executing file.
>
> Best -- Eric
>
>>
>> Thanks,
>>
>> -- Mike
>>
>
>
> Footnotes:
> [1] http://cs.unm.edu/~eschulte/data/babel-c-execution.html
> http://cs.unm.edu/~eschulte/data/babel-c-execution.org
>
> --
> Eric Schulte
> http://cs.unm.edu/~eschulte/
>
