CODEWITHSUNDEEP
enumsrust
Jeroen
Jeroen

Reputation: 16815

How to specify the representation type for an enum in Rust to interface with C++?

Is there a way I can make a C++ style enumeration with explicit representation type in Rust? Example:

enum class Number: int16_t {
    Zero, One, Two, Three, Four, Five, Six, Seven, Eight, Nine
};

If not, is there another way I can organize variables like that? I am interfacing with an external library, so specifying the type is important. I know I could just do: 

type Number = int16_t;
let One: Number = 1;
let Two: Number = 2;
let Three: Number = 3;

But that introduces a lot of redundancy, in my opinion;

Note this question is not a duplicate of Is it possible to wrap C enums in Rust? as it is about wrapping C++, not wrapping C.

Upvotes: 6

Views: 2616

Answers (1)

A.B.
A.B.

Reputation: 16630

You can specify a representation for the enum.

#[repr(i16)]
enum Foo {
    One = 1,
    Two = 2,
}

Upvotes: 16

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