88 lines
2.1 KiB
Rust
88 lines
2.1 KiB
Rust
use super::*;
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use core::mem::transmute_copy;
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use core::mem::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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/// There is no need to implement this trait. Blanket implementations are provided for all applicable Windows types.
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pub trait Param<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 param(self) -> ParamValue<T>;
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}
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impl<T> Param<T> for Option<&T>
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where
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T: Type<T>,
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{
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unsafe fn param(self) -> ParamValue<T> {
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ParamValue::Borrowed(match self {
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Some(item) => transmute_copy(item),
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None => zeroed(),
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})
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}
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}
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impl<T, U> Param<T, InterfaceType> for &U
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where
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T: TypeKind<TypeKind = InterfaceType> + Clone,
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T: Interface,
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U: Interface,
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U: imp::CanInto<T>,
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{
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unsafe fn param(self) -> ParamValue<T> {
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if U::QUERY {
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self.cast()
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.map_or(ParamValue::Borrowed(zeroed()), |ok| ParamValue::Owned(ok))
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} else {
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ParamValue::Borrowed(transmute_copy(self))
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}
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}
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}
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impl<T> Param<T, CloneType> for &T
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where
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T: TypeKind<TypeKind = CloneType> + Clone,
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{
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unsafe fn param(self) -> ParamValue<T> {
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ParamValue::Borrowed(transmute_copy(self))
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}
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}
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impl<T, U> Param<T, CopyType> for U
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where
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T: TypeKind<TypeKind = CopyType> + Clone,
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U: TypeKind<TypeKind = CopyType> + Clone,
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U: imp::CanInto<T>,
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{
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unsafe fn param(self) -> ParamValue<T> {
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ParamValue::Owned(transmute_copy(&self))
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}
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}
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impl Param<PCWSTR> for &BSTR {
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unsafe fn param(self) -> ParamValue<PCWSTR> {
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ParamValue::Owned(PCWSTR(self.as_ptr()))
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}
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}
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impl Param<PCWSTR> for &HSTRING {
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unsafe fn param(self) -> ParamValue<PCWSTR> {
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ParamValue::Owned(PCWSTR(self.as_ptr()))
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}
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}
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impl Param<PCWSTR> for PWSTR {
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unsafe fn param(self) -> ParamValue<PCWSTR> {
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ParamValue::Owned(PCWSTR(self.0))
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}
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}
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impl Param<PCSTR> for PSTR {
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unsafe fn param(self) -> ParamValue<PCSTR> {
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ParamValue::Owned(PCSTR(self.0))
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}
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}
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