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.

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§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.

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

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

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