It should be (C . t)

it looks like ob-C also handles C++.

John

-----------------------------------
Professor John Kitchin
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803
@johnkitchin
http://kitchingroup.cheme.cmu.edu


On Sat, May 26, 2018 at 5:15 AM, Van L <van@scratch.space> wrote:

> Hello.
>
> The `m-x customize’ path to `org-babel-load-languages’ or the following
> method won’t accept C++.
>
> #+BEGIN_SRC elisp :results none
>   (org-babel-do-load-languages
>    'org-babel-load-languages
>    '((C++ . t)))
> #+END_SRC
>
> The messages buffer has the following.
>
>    executing Elisp code block...
>    org-babel-do-load-languages: Cannot open load file: No such file or
> directory, ob-C++
>
> M-x org-version
> Org mode version 9.1.9
>
> M-x emacs-version
> GNU Emacs 26.1
> rc1
>
> Section 14.7 Languages in the Org Mode working with source code infopages
> lists C++.
>