[PROJ] Behavior of proj_create_crs_to_crs() when using +proj=utm format

[Even Rouault]

> Thanks for your complete answer, Even. Only for curiosity (and without
> any criticism), why PROJ moved part of the code from the beautiful and
> practical C language to the ugly C++?

You're coming late to the party. That was discussed in the thread at 
https://lists.osgeo.org/pipermail/proj/2018-May/007799.html

yep C++ can be ugly, but good luck with memory management if you want to 
implement ISO:19111 in C. Oh well, you could certainly do that, but it 
would be extremely verbose and error prone.

| I hope at least the C interface will be forever maintained.

Yes, as long as C remains something available and used.

-- 

http://www.spatialys.com
My software is free, but my time generally not.