Dear Antonio, thank you very much for these tips! I will try them …
Sincerely, Albert > Am 24.07.2023 um 17:41 schrieb Antonio Sanchez <[email protected]>: > > From the error, it sounds like an issue with your includes - I would > double-check that before troubleshooting anything else. Theoretically, if > you are using Objective-C++, you should be able to include C++ headers just > fine. > > Though from a brief search, I did find references that "sometimes this can > lead to issues", without any specific cause mentioned. From what I've found, > it suggests exporting a C interface and using that in your Objective-C > program. To do that, you would need to isolate all your use of Eigen to a > C++ translation unit, write your own C wrapper around it, using something like > > #ifdef __cplusplus > extern "C" { > #endif > // Your wrapper implementation here. > #ifdef __cplusplus > } > #endif > You would then need to build your wrapper with a C++ compiler. Once you have > that, your Objective-C program should be able to link to this without issue. > ~Antonio > > On Mon, Jul 24, 2023 at 7:38 AM Lang, Albert-Georg <[email protected] > <mailto:[email protected]>> wrote: >> Hello all, >> >> I want to port a project which uses Eigen from Visual C++ to Objective-C(++) >> for Macintosh computers. The problem is that I always get multiple error >> messages (e.g., "Explicit specialization of undeclared template struct >> 'traits'" in Block.h, see picture). I get these same error messages >> regardless of which (Eigen-) project I am compiling as soon as I mix >> Objective-C with C++ (which comes with Eigen). What does work is compiling a >> pure C++ project. >> >> I have read on stackoverflow >> <https://stackoverflow.com/questions/26889142/using-eigen-in-a-c-project> >> that this might have to do with the "language" Objective-C++, this means >> that this specific C++ code cannot be easily compiled with a C compiler. >> Unfortunately, the tip described on this page does not work. >> >> Any help would be welcome! >> >> Sincerely, Albert >> >> <Bildschirmfoto 2023-07-24 um 16.23.51.png> >> >> >>
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