Struct block_sys::Block_byref_header

#[repr(C)]pub struct Block_byref_header {
    pub isa: *const Class,
    pub forwarding: *mut Block_byref_header,
    pub flags: block_flags,
    pub size: u32,
}

👎Deprecated: block-sys is deprecated. Use block2::ffi instead

Expand description

Structure used for on-stack variables that are referenced by blocks.

Fields§

§isa: *const Class

👎Deprecated: block-sys is deprecated. Use block2::ffi instead

Class pointer. Currently unused on GNUStep and always NULL. Could be used in the future to support introspection.

§forwarding: *mut Block_byref_header

👎Deprecated: block-sys is deprecated. Use block2::ffi instead

The pointer to the structure that contains the real version of the data. All accesses go via this pointer. If an on-stack byref structure is copied to the heap, then its forwarding pointer should point to the heap version. Otherwise it should point to itself.

§flags: block_flags

👎Deprecated: block-sys is deprecated. Use block2::ffi instead

Flags and reference count.

TODO: Volatile!

§size: u32

👎Deprecated: block-sys is deprecated. Use block2::ffi instead

Available on crate feature apple only.

Size of this structure.

Auto Trait Implementations§

impl !RefUnwindSafe for Block_byref_header

impl !Send for Block_byref_header

impl !Sync for Block_byref_header

impl Unpin for Block_byref_header

impl !UnwindSafe for Block_byref_header

Blanket Implementations§

impl<T> Any for T
where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T
where T: ?Sized,

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T
where T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

impl<T, U> Into<U> for T
where U: From<T>,

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

impl<T, U> TryFrom<U> for T
where U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.