Struct block_sys::Block_byref_header

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

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

Fields

isa: *const Class

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

forwarding: *mut Block_byref_header

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

Flags and reference count.

TODO: Volatile!

size: u32
Available on crate feature apple only.

Size of this structure.

Auto Trait Implementations

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Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

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

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.