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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},
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:*const 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: this as *const T as *const ErasedObject,
vtable: vtable_for.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))]
struct ConstGenericVTable{
layout:&'static TypeLayout,
partial_eq:unsafe extern "C" fn(&ErasedObject,&ErasedObject)->bool,
#[sabi(last_prefix_field)]
debug:unsafe extern "C" fn(&ErasedObject,FormattingMode,&mut RString)->RResult<(),()>,
}
pub struct ConstGenericVTableFor<T>{
vtable:ConstGenericVTable_Ref,
_marker:PhantomData<T>,
}
impl<T> ConstGenericVTableFor<T>
where
T: StableAbi + Eq + PartialEq + Debug + Send + Sync
{
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,
};
}