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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
use crate::{
abi_stability::{
extra_checks::{ExtraChecksError,TypeCheckerMut},
check_layout_compatibility,
},
erased_types::{
c_functions::{adapt_std_fmt,debug_impl,partial_eq_impl},
FormattingMode,
},
marker_type::ErasedObject,
prefix_type::{PrefixTypeTrait,WithMetadata},
sabi_types::RRef,
std_types::{RString,RResult,ROk,RErr},
type_layout::TypeLayout,
StableAbi,
};
use std::{
cmp::{Eq,PartialEq},
fmt::{self,Debug},
marker::PhantomData,
};
#[repr(C)]
#[derive(Copy,Clone,StableAbi)]
pub struct ConstGeneric{
ptr: RRef<'static, ErasedObject>,
vtable: ConstGenericVTable_Ref,
}
unsafe impl Send for ConstGeneric{}
unsafe impl Sync for ConstGeneric{}
impl ConstGeneric{
pub const fn new<T>(this:&'static T, vtable_for:ConstGenericVTableFor<T>)->Self{
Self{
ptr: unsafe{ RRef::from_raw(this as *const T as *const ErasedObject) },
vtable: vtable_for.vtable,
}
}
pub const unsafe fn from_erased(this: *const (), vtable: ConstGenericVTable_Ref)->Self{
Self{
ptr: RRef::from_raw(this as *const ErasedObject),
vtable,
}
}
pub fn is_equal(
&self,
other:&Self,
mut checker:TypeCheckerMut<'_>
)->Result<bool,ExtraChecksError> {
match checker.check_compatibility(self.vtable.layout(),other.vtable.layout()) {
ROk(_)=>unsafe{
Ok(self.vtable.partial_eq()( self.ptr, other.ptr ))
},
RErr(e)=>{
Err(e)
}
}
}
}
impl Debug for ConstGeneric{
fn fmt(&self,f:&mut fmt::Formatter<'_>)->fmt::Result{
unsafe{
adapt_std_fmt::<ErasedObject>(
self.ptr,
self.vtable.debug(),
f
)
}
}
}
impl PartialEq for ConstGeneric{
fn eq(&self,other:&Self)->bool{
if check_layout_compatibility(self.vtable.layout(),other.vtable.layout()).is_err() {
false
}else{
unsafe{
self.vtable.partial_eq()( self.ptr, other.ptr )
}
}
}
}
impl Eq for ConstGeneric{}
#[repr(C)]
#[derive(StableAbi)]
#[sabi(kind(Prefix))]
#[sabi(missing_field(panic))]
pub struct ConstGenericVTable {
layout:&'static TypeLayout,
partial_eq:unsafe extern "C" fn(RRef<'_, ErasedObject>,RRef<'_, ErasedObject>)->bool,
#[sabi(last_prefix_field)]
debug:unsafe extern "C" fn(RRef<'_, ErasedObject>,FormattingMode,&mut RString)->RResult<(),()>,
}
pub struct ConstGenericVTableFor<T>{
vtable:ConstGenericVTable_Ref,
_marker:PhantomData<T>,
}
impl<T> ConstGenericVTableFor<T> {
pub const fn infer_type(&self, _: &T) {}
pub const fn erased(&self) -> ConstGenericVTable_Ref {
self.vtable
}
}
impl<T> ConstGenericVTableFor<T>
where
T: StableAbi + Eq + PartialEq + Debug + Send + Sync + 'static
{
const _VTABLE_STATIC: WithMetadata<ConstGenericVTable> = {
WithMetadata::new(
PrefixTypeTrait::METADATA,
ConstGenericVTable{
layout: <T as StableAbi>::LAYOUT,
partial_eq: partial_eq_impl::<T>,
debug: debug_impl::<T>,
}
)
};
pub const NEW:ConstGenericVTableFor<T>=ConstGenericVTableFor{
vtable: ConstGenericVTable_Ref(Self::_VTABLE_STATIC.static_as_prefix()),
_marker: PhantomData,
};
}
#[doc(hidden)]
pub struct ConstGenericErasureHack<T: ?Sized>{
pub vtable: ConstGenericVTable_Ref,
pub value: T,
}
#[doc(hidden)]
impl<T> ConstGenericErasureHack<T> {
pub const fn new(vtable: ConstGenericVTableFor<T>, value: T) -> Self {
Self {
vtable: vtable.erased(),
value,
}
}
}