如何指定Rust中的枚举的表示类型与C ++接口？ [英] How to specify the representation type for an enum in Rust to interface with C++?

问题描述

有没有办法可以在Rust中使用显式表示类型进行C ++风格的枚举？例如：

 枚举类号：int16_t {
零，一，二，三，四，五，六，七，八，九
}; 
  

如果没有，是否有另一种方式可以组织这样的变量？我正在与外部库进行连接，因此指定类型很重要。我知道我可以做：

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

但在我看来，这引入了很多冗余;

---

请注意，此问题与是否可以在Rust中包含C枚举？，因为它是关于包装C ++，而不是包装C。

解决方案

您可以指定枚举的表示。

 ＃[repr（i16）] 
 enum Foo {
 One = 1，
 Two = 2，
} 
  / pre> 
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.
解决方案
You can specify a representation for the enum.
#[repr(i16)]
enum Foo {
    One = 1,
    Two = 2,
}


                        
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