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use super::*;
/// A transaction object.
#[repr(transparent)]
#[derive(Debug)]
pub struct Transaction(pub(crate) HANDLE);
impl Transaction {
/// Creates a new transaction.
pub fn new() -> Result<Self> {
let handle = unsafe { CreateTransaction(null_mut(), null_mut(), 0, 0, 0, 0, null()) };
if core::ptr::eq(handle, INVALID_HANDLE_VALUE) {
Err(Error::from_win32())
} else {
Ok(Self(handle))
}
}
/// Commits the transaction.
///
/// The transaction rolls back if it is dropped before `commit` is called.
pub fn commit(self) -> Result<()> {
let result = unsafe { CommitTransaction(self.0) };
if result == 0 {
Err(Error::from_win32())
} else {
Ok(())
}
}
/// Constructs a transaction object from an existing handle.
///
/// # Safety
///
/// This function takes ownership of the handle.
/// The handle must be owned by the caller and safe to free with `CloseHandle`.
pub unsafe fn from_raw(handle: *mut core::ffi::c_void) -> Self {
Self(handle)
}
/// Returns the underlying transaction handle.
pub fn as_raw(&self) -> *mut core::ffi::c_void {
self.0
}
}
impl Drop for Transaction {
fn drop(&mut self) {
unsafe { CloseHandle(self.0) };
}
}
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