audir 0.1.0

Low-level audio library
Documentation 
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use super::WasapiResult;
use std::{fmt, hash::{Hash, Hasher}, ops::Deref, ptr};
use winapi::ctypes::c_void;
use winapi::shared::guiddef;
use winapi::um::unknwnbase::IUnknown;
use winapi::Interface;

#[repr(transparent)]
pub struct WeakPtr<T>(*mut T);

impl<T> WeakPtr<T> {
    pub fn null() -> Self {
        WeakPtr(ptr::null_mut())
    }

    pub unsafe fn from_raw(raw: *mut T) -> Self {
        WeakPtr(raw)
    }

    pub fn is_null(self) -> bool {
        self.0.is_null()
    }

    pub fn as_ptr(self) -> *const T {
        self.0
    }

    pub fn as_mut_ptr(self) -> *mut T {
        self.0
    }

    pub unsafe fn mut_void(&mut self) -> *mut *mut c_void {
        &mut self.0 as *mut *mut _ as *mut *mut _
    }

    pub unsafe fn as_unknown(&self) -> &IUnknown {
        debug_assert!(!self.is_null());
        &*(self.0 as *mut IUnknown)
    }
}

impl<T: Interface> WeakPtr<T> {
    // Cast creates a new WeakPtr requiring explicit destroy call.
    pub unsafe fn cast<U>(self) -> WasapiResult<WeakPtr<U>>
    where
        U: Interface,
    {
        let mut obj = WeakPtr::<U>::null();
        let hr = self
            .as_unknown()
            .QueryInterface(&U::uuidof(), obj.mut_void());
        (obj, hr)
    }

    // Destroying one instance of the WeakPtr will invalidate all
    // copies and clones.
    pub unsafe fn destroy(self) {
        self.as_unknown().Release();
    }
}

impl<T> Clone for WeakPtr<T> {
    fn clone(&self) -> Self {
        WeakPtr(self.0)
    }
}

impl<T> Copy for WeakPtr<T> {}

impl<T> Deref for WeakPtr<T> {
    type Target = T;
    fn deref(&self) -> &T {
        debug_assert!(!self.is_null());
        unsafe { &*self.0 }
    }
}

impl<T> fmt::Debug for WeakPtr<T> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "WeakPtr( ptr: {:?} )", self.0)
    }
}

impl<T> PartialEq<*mut T> for WeakPtr<T> {
    fn eq(&self, other: &*mut T) -> bool {
        self.0 == *other
    }
}

impl<T> PartialEq for WeakPtr<T> {
    fn eq(&self, other: &Self) -> bool {
        self.0 == other.0
    }
}

impl<T> Eq for WeakPtr<T> {}

impl<T> Hash for WeakPtr<T> {
    fn hash<H: Hasher>(&self, state: &mut H) {
        self.0.hash(state);
    }
}

#[derive(Copy, Clone, Debug)]
pub struct Guid(pub guiddef::GUID);

impl PartialEq for Guid {
    fn eq(&self, other: &Self) -> bool {
        guiddef::IsEqualGUID(&self.0, &other.0)
    }
}

impl Eq for Guid {}