Function NSMapMember 

pub unsafe extern "C-unwind" fn NSMapMember(
    table: &NSMapTable,
    key: NonNull<c_void>,
    original_key: *mut *mut c_void,
    value: *mut *mut c_void,
) -> bool

Available on crate feature NSMapTable only.

Safety

• table generic should be of the correct type.
• key must be a valid pointer.
• original_key must be a valid pointer or null.
• value must be a valid pointer or null.