#[repr(C)]pub struct MDLMeshBufferData { /* private fields */ }
MDLMeshBuffer
only.Expand description
A CPU memory backed mesh buffer
See also Apple’s documentation
Implementations§
Source§impl MDLMeshBufferData
impl MDLMeshBufferData
Sourcepub unsafe fn initWithType_length(
this: Allocated<Self>,
type: MDLMeshBufferType,
length: NSUInteger,
) -> Retained<Self>
pub unsafe fn initWithType_length( this: Allocated<Self>, type: MDLMeshBufferType, length: NSUInteger, ) -> Retained<Self>
instantiate a new data backed mesh buffer
Parameter type
: the intended use of the buffer
Parameter length
: the size of buffer to allocate, in bytes
Sourcepub unsafe fn initWithType_data(
this: Allocated<Self>,
type: MDLMeshBufferType,
data: Option<&NSData>,
) -> Retained<Self>
pub unsafe fn initWithType_data( this: Allocated<Self>, type: MDLMeshBufferType, data: Option<&NSData>, ) -> Retained<Self>
instantiate a new data backed mesh buffer
Parameter type
: the intended use of the buffer
Parameter data
: the data to be used as a mesh buffer. It will be copied.
pub unsafe fn data(&self) -> Retained<NSData>
Methods from Deref<Target = NSObject>§
Sourcepub fn doesNotRecognizeSelector(&self, sel: Sel) -> !
pub fn doesNotRecognizeSelector(&self, sel: Sel) -> !
Handle messages the object doesn’t recognize.
See Apple’s documentation for details.
Methods from Deref<Target = AnyObject>§
Sourcepub fn class(&self) -> &'static AnyClass
pub fn class(&self) -> &'static AnyClass
Dynamically find the class of this object.
§Panics
May panic if the object is invalid (which may be the case for objects
returned from unavailable init
/new
methods).
§Example
Check that an instance of NSObject
has the precise class NSObject
.
use objc2::ClassType;
use objc2::runtime::NSObject;
let obj = NSObject::new();
assert_eq!(obj.class(), NSObject::class());
Sourcepub unsafe fn get_ivar<T>(&self, name: &str) -> &Twhere
T: Encode,
👎Deprecated: this is difficult to use correctly, use Ivar::load
instead.
pub unsafe fn get_ivar<T>(&self, name: &str) -> &Twhere
T: Encode,
Ivar::load
instead.Use Ivar::load
instead.
§Safety
The object must have an instance variable with the given name, and it
must be of type T
.
See Ivar::load_ptr
for details surrounding this.
Sourcepub fn downcast_ref<T>(&self) -> Option<&T>where
T: DowncastTarget,
pub fn downcast_ref<T>(&self) -> Option<&T>where
T: DowncastTarget,
Attempt to downcast the object to a class of type T
.
This is the reference-variant. Use Retained::downcast
if you want
to convert a retained object to another type.
§Mutable classes
Some classes have immutable and mutable variants, such as NSString
and NSMutableString
.
When some Objective-C API signature says it gives you an immutable class, it generally expects you to not mutate that, even though it may technically be mutable “under the hood”.
So using this method to convert a NSString
to a NSMutableString
,
while not unsound, is generally frowned upon unless you created the
string yourself, or the API explicitly documents the string to be
mutable.
See Apple’s documentation on mutability and on
isKindOfClass:
for more details.
§Generic classes
Objective-C generics are called “lightweight generics”, and that’s because they aren’t exposed in the runtime. This makes it impossible to safely downcast to generic collections, so this is disallowed by this method.
You can, however, safely downcast to generic collections where all the
type-parameters are AnyObject
.
§Panics
This works internally by calling isKindOfClass:
. That means that the
object must have the instance method of that name, and an exception
will be thrown (if CoreFoundation is linked) or the process will abort
if that is not the case. In the vast majority of cases, you don’t need
to worry about this, since both root objects NSObject
and
NSProxy
implement this method.
§Examples
Cast an NSString
back and forth from NSObject
.
use objc2::rc::Retained;
use objc2_foundation::{NSObject, NSString};
let obj: Retained<NSObject> = NSString::new().into_super();
let string = obj.downcast_ref::<NSString>().unwrap();
// Or with `downcast`, if we do not need the object afterwards
let string = obj.downcast::<NSString>().unwrap();
Try (and fail) to cast an NSObject
to an NSString
.
use objc2_foundation::{NSObject, NSString};
let obj = NSObject::new();
assert!(obj.downcast_ref::<NSString>().is_none());
Try to cast to an array of strings.
use objc2_foundation::{NSArray, NSObject, NSString};
let arr = NSArray::from_retained_slice(&[NSObject::new()]);
// This is invalid and doesn't type check.
let arr = arr.downcast_ref::<NSArray<NSString>>();
This fails to compile, since it would require enumerating over the array to ensure that each element is of the desired type, which is a performance pitfall.
Downcast when processing each element instead.
use objc2_foundation::{NSArray, NSObject, NSString};
let arr = NSArray::from_retained_slice(&[NSObject::new()]);
for elem in arr {
if let Some(data) = elem.downcast_ref::<NSString>() {
// handle `data`
}
}
Trait Implementations§
Source§impl AsRef<AnyObject> for MDLMeshBufferData
impl AsRef<AnyObject> for MDLMeshBufferData
Source§impl AsRef<MDLMeshBufferData> for MDLMeshBufferData
impl AsRef<MDLMeshBufferData> for MDLMeshBufferData
Source§impl AsRef<NSObject> for MDLMeshBufferData
impl AsRef<NSObject> for MDLMeshBufferData
Source§impl Borrow<AnyObject> for MDLMeshBufferData
impl Borrow<AnyObject> for MDLMeshBufferData
Source§impl Borrow<NSObject> for MDLMeshBufferData
impl Borrow<NSObject> for MDLMeshBufferData
Source§impl ClassType for MDLMeshBufferData
impl ClassType for MDLMeshBufferData
Source§const NAME: &'static str = "MDLMeshBufferData"
const NAME: &'static str = "MDLMeshBufferData"
Source§type ThreadKind = <<MDLMeshBufferData as ClassType>::Super as ClassType>::ThreadKind
type ThreadKind = <<MDLMeshBufferData as ClassType>::Super as ClassType>::ThreadKind
Source§impl CopyingHelper for MDLMeshBufferData
impl CopyingHelper for MDLMeshBufferData
Source§type Result = MDLMeshBufferData
type Result = MDLMeshBufferData
Self
if the type has no
immutable counterpart. Read moreSource§impl Debug for MDLMeshBufferData
impl Debug for MDLMeshBufferData
Source§impl Deref for MDLMeshBufferData
impl Deref for MDLMeshBufferData
Source§impl Hash for MDLMeshBufferData
impl Hash for MDLMeshBufferData
Source§impl MDLMeshBuffer for MDLMeshBufferData
impl MDLMeshBuffer for MDLMeshBufferData
Source§unsafe fn fillData_offset(&self, data: &NSData, offset: NSUInteger)
unsafe fn fillData_offset(&self, data: &NSData, offset: NSUInteger)
Source§unsafe fn length(&self) -> NSUInteger
unsafe fn length(&self) -> NSUInteger
Source§unsafe fn allocator(
&self,
) -> Retained<ProtocolObject<dyn MDLMeshBufferAllocator>>
unsafe fn allocator( &self, ) -> Retained<ProtocolObject<dyn MDLMeshBufferAllocator>>
Source§unsafe fn zone(&self) -> Retained<ProtocolObject<dyn MDLMeshBufferZone>>
unsafe fn zone(&self) -> Retained<ProtocolObject<dyn MDLMeshBufferZone>>
Source§impl Message for MDLMeshBufferData
impl Message for MDLMeshBufferData
Source§impl NSCopying for MDLMeshBufferData
impl NSCopying for MDLMeshBufferData
Source§impl NSObjectProtocol for MDLMeshBufferData
impl NSObjectProtocol for MDLMeshBufferData
Source§fn isEqual(&self, other: Option<&AnyObject>) -> bool
fn isEqual(&self, other: Option<&AnyObject>) -> bool
Source§fn hash(&self) -> usize
fn hash(&self) -> usize
Source§fn isKindOfClass(&self, cls: &AnyClass) -> bool
fn isKindOfClass(&self, cls: &AnyClass) -> bool
Source§fn is_kind_of<T>(&self) -> bool
fn is_kind_of<T>(&self) -> bool
isKindOfClass
directly, or cast your objects with AnyObject::downcast_ref