Difficult to use Bullet(C++) from Swift

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Latest my app is made with Objective-C x OpenGL ES 2.0 x Bullet .
And I’d like to make next app with Swift x Metal x Bullet , so I have been trying to see whether it is possible or not, and I got one conclusion that it is really difficult to use Bullet (written in C++) from Swift.

I made some wrapper classes to use Bullet from Swift. They made my project very complex, difficult to understand… I like Swift but I gave up to use it in next new project.
I will make my new app with Objective-C x Metal x Bullet
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