58 lines
1.5 KiB
Rust
58 lines
1.5 KiB
Rust
use super::*;
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use core::mem::{take, transmute_copy, zeroed};
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/// Provides automatic parameter conversion in cases where the Windows API expects implicit conversion support.
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///
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/// This is a mutable version of [Param] meant to support out parameters.
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/// There is no need to implement this trait. Blanket implementations are provided for all applicable Windows types.
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pub trait OutParam<T: TypeKind, C = <T as TypeKind>::TypeKind>: Sized
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where
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T: Type<T>,
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{
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#[doc(hidden)]
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unsafe fn borrow_mut(&self) -> OutRef<'_, T>;
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}
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impl<T> OutParam<T, CloneType> for &mut T
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where
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T: TypeKind<TypeKind = CloneType> + Clone + Default,
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{
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unsafe fn borrow_mut(&self) -> OutRef<'_, T> {
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let this: &mut T = transmute_copy(self);
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take(this);
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transmute_copy(self)
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}
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}
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impl<T> OutParam<T, CopyType> for &mut T
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where
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T: TypeKind<TypeKind = CopyType> + Clone + Default,
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{
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unsafe fn borrow_mut(&self) -> OutRef<'_, T> {
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transmute_copy(self)
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}
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}
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impl<T> OutParam<T, InterfaceType> for &mut Option<T>
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where
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T: TypeKind<TypeKind = InterfaceType> + Clone,
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{
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unsafe fn borrow_mut(&self) -> OutRef<'_, T> {
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let this: &mut Option<T> = transmute_copy(self);
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take(this);
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transmute_copy(self)
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}
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}
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impl<T> OutParam<T> for Option<&mut T>
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where
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T: Type<T>,
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{
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unsafe fn borrow_mut(&self) -> OutRef<'_, T> {
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match self {
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Some(this) => transmute_copy(this),
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None => zeroed(),
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}
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}
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}
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