Comments (3)
Are you using the checked-in Xcode project? I think it might be broken currently by an update in Xcode #119.
But you should be able to generate a working Xcode project using CMake.
cmake -G Xcode .
https://stackoverflow.com/a/41830798/2779792
Edit: this might answer your question more directly... C++17 features are needed because I used std::optional
.
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I want to us mx in my iOS project as static library. but wrong!
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Are you using an Objective C++ file as a bridge to swift? I found this which suggests that the problem could be that you are using Objective-C instead of Objective-C++. https://stackoverflow.com/a/54498903
I don't know how to bridge between C++ and Swift, but it seems like that is the source of the problem. The header file you pictured is being evaluated in C instead of C++.
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