Add an example of Bool usage

Author: madsmtm

objc2/src/bool.rs

@@ -3,11 +3,21 @@ use core::fmt;
 
 /// The Objective-C `BOOL` type.
 ///
-/// To convert an Objective-C `BOOL` into a Rust [`bool`], call the one of the
+/// Usually, you would convert this into a Rust [`bool`] with the
 /// [`Bool::is_false`] or [`Bool::is_true`] methods.
 ///
 /// This is FFI-safe and can be used in directly with
 /// [`msg_send!`][`crate::msg_send`].
+///
+/// # Example
+///
+/// ```no_run
+/// use objc2::{class, msg_send};
+/// use objc2::runtime::{Object, Bool};
+/// let ns_value: *mut Object = unsafe { msg_send![class!(NSValue), initWithBool: Bool::YES] };
+/// let rtn: Bool = unsafe { msg_send![ns_value, boolValue] };
+/// assert!(rtn.is_true());
+/// ```
 #[repr(transparent)]
 // TODO: Might have to implement some of these manually, in case someone puts
 // something that is not 0 or 1 into the Bool?

objc2/src/runtime.rs

@@ -293,7 +293,7 @@ impl Class {
 
     /// Checks whether this class conforms to the specified protocol.
     pub fn conforms_to(&self, proto: &Protocol) -> bool {
-        unsafe { Bool::from_raw(class_conformsToProtocol(self.as_ptr(), proto.as_ptr())).into() }
+        unsafe { Bool::from_raw(class_conformsToProtocol(self.as_ptr(), proto.as_ptr())).is_true() }
     }
 
     /// Get a list of the protocols to which this class conforms.
@@ -368,7 +368,9 @@ impl Protocol {
 
     /// Checks whether this protocol conforms to the specified protocol.
     pub fn conforms_to(&self, proto: &Protocol) -> bool {
-        unsafe { Bool::from_raw(protocol_conformsToProtocol(self.as_ptr(), proto.as_ptr())).into() }
+        unsafe {
+            Bool::from_raw(protocol_conformsToProtocol(self.as_ptr(), proto.as_ptr())).is_true()
+        }
     }
 
     /// Returns the name of self.