How to create a C++ object from Rust?

Question

I know that a Box<SomeRustStruct> can be interpreted as a raw pointer SomeRustStruct* in C++, when the struct has a C representation.

How to do the converse? I only found some usages of bindgen.

How do I create and hold a pointer to a C++ object in Rust?

Masklinn · Accepted Answer · 2020-10-22 05:42:27Z

2

The same way you create and hold a pointer to a C object in Rust: the C++ type would be represented by an opaque struct S on the Rust side, and the pointer is an *mut S.

You can also declare the type as a non-opaque type (but beware issues of layout in that case) if you need to perform direct field access on the Rust side but don't (want to) have accessor functions.

answered Oct 22, 2020 at 5:42

Masklinn

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Poperton Over a year ago

Could you explain how to return the new object in C++ to Rust? Some casting would be needed for the opaque types, right?

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