1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59

/*!
Contains TypeInfo,metadata for a type.
*/

use std::fmt;

use crate::{
    sabi_types::{Constructor,MaybeCmp,VersionStrings},
    std_types::{RStr,utypeid::UTypeId},
};


/// Metadata stored in the vtable of `DynTrait<_>`
#[derive(Debug, Eq, PartialEq)]
#[repr(C)]
#[derive(StableAbi)]
pub struct TypeInfo {
    pub size: usize,
    pub alignment: usize,
    #[doc(hidden)]
    pub _uid: Constructor<MaybeCmp<UTypeId>>,
    pub type_name: Constructor<RStr<'static>>,
    pub module: RStr<'static>,
    pub package: RStr<'static>,
    pub package_version: VersionStrings,
    #[doc(hidden)]
    pub _private_field: (),
}

impl TypeInfo {
    /// Whether the `self` is the TypeInfo for the same type as `other`
    pub fn is_compatible(&self, other: &Self) -> bool {
        self._uid==other._uid
    }
}

impl fmt::Display for TypeInfo {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        writeln!(
            f,
            "type:{ty}\n\
             size:{size} alignment:{alignment}\n\
             module:'{module}'\n\
             package:'{package}'\n\
             package_version:{package_version}\n\
             ",
            ty=self.type_name,
            size=self.size, 
            alignment=self.alignment, 
            module=self.module, 
            package=self.package, 
            package_version=self.package_version
        )
    }
}


////////////////////////////////////////////