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// Copyright 2013 The Servo Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! An immutable bag of elements.
use core_foundation_sys::base::{kCFAllocatorDefault, CFRelease, CFTypeRef};
pub use core_foundation_sys::set::*;
use crate::base::{CFIndexConvertible, TCFType};
use std::marker::PhantomData;
use std::os::raw::c_void;
/// An immutable bag of elements.
pub struct CFSet<T = *const c_void>(CFSetRef, PhantomData<T>);
impl<T> Drop for CFSet<T> {
fn drop(&mut self) {
unsafe { CFRelease(self.as_CFTypeRef()) }
}
}
impl_TCFType!(CFSet<T>, CFSetRef, CFSetGetTypeID);
impl_CFTypeDescription!(CFSet);
impl CFSet {
/// Creates a new set from a list of `CFType` instances.
pub fn from_slice<T>(elems: &[T]) -> CFSet<T>
where
T: TCFType,
{
unsafe {
let elems: Vec<CFTypeRef> = elems.iter().map(|elem| elem.as_CFTypeRef()).collect();
let set_ref = CFSetCreate(
kCFAllocatorDefault,
elems.as_ptr(),
elems.len().to_CFIndex(),
&kCFTypeSetCallBacks,
);
TCFType::wrap_under_create_rule(set_ref)
}
}
}
impl<T> CFSet<T> {
/// Get the number of elements in the `CFSet`.
pub fn len(&self) -> usize {
unsafe { CFSetGetCount(self.0) as usize }
}
/// Returns `true` if the set contains no elements.
pub fn is_empty(&self) -> bool {
self.len() == 0
}
}