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use std::os::raw::c_void;
use runtime::{objc_autoreleasePoolPush, objc_autoreleasePoolPop};
// we use a struct to ensure that objc_autoreleasePoolPop during unwinding.
struct AutoReleaseHelper {
context: *mut c_void,
}
impl AutoReleaseHelper {
unsafe fn new() -> Self {
AutoReleaseHelper { context: objc_autoreleasePoolPush() }
}
}
impl Drop for AutoReleaseHelper {
fn drop(&mut self) {
unsafe { objc_autoreleasePoolPop(self.context) }
}
}
/**
Execute `f` in the context of a new autorelease pool. The pool is drained
after the execution of `f` completes.
This corresponds to `@autoreleasepool` blocks in Objective-C and Swift.
*/
pub fn autoreleasepool<T, F: FnOnce() -> T>(f: F) -> T {
let _context = unsafe { AutoReleaseHelper::new() };
f()
}