objc 0.0.1

Objective-C Runtime bindings and wrapper for Rust.
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use runtime::{Class, Object};

/// Types that may be sent Objective-C messages.
/// For example: objects, classes, and blocks.
pub trait Message { }

impl Message for Object { }

impl Message for Class { }

/// A trait for converting to a pointer to a type that may be sent Objective-C
/// messages.
pub trait ToMessage<T: Message> {
	fn as_ptr(&self) -> *mut T;

	fn is_nil(&self) -> bool {
		self.as_ptr().is_null()
	}
}

impl<T: Message> ToMessage<T> for *const T {
	fn as_ptr(&self) -> *mut T {
		*self as *mut T
	}
}

impl<T: Message> ToMessage<T> for *mut T {
	fn as_ptr(&self) -> *mut T {
		*self
	}
}

impl<'a, T: Message> ToMessage<T> for &'a T {
	fn as_ptr(&self) -> *mut T {
		*self as *const T as *mut T
	}
}

impl<'a, T: Message> ToMessage<T> for &'a mut T {
	fn as_ptr(&self) -> *mut T {
		*self
	}
}

impl<'a, T: Message> ToMessage<T> for Option<&'a T> {
	fn as_ptr(&self) -> *mut T {
		match *self {
			None => RawPtr::null(),
			Some(ref obj) => obj.as_ptr(),
		}
	}
}

impl<'a, T: Message> ToMessage<T> for Option<&'a mut T> {
	fn as_ptr(&self) -> *mut T {
		match *self {
			None => RawPtr::null(),
			Some(ref obj) => obj.as_ptr(),
		}
	}
}

/// Converts to an Object pointer; this function is mainly used by the
/// `msg_send!` macro.
pub fn to_obj_ptr<T: Message, M: ToMessage<T>>(obj_ref: &M) -> *mut Object {
	obj_ref.as_ptr() as *mut Object
}