Struct field_offset::FieldOffset
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pub struct FieldOffset<T, U>(_, _);
Represents a pointer to a field of type U
within the type T
Methods
impl<T, U> FieldOffset<T, U>
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unsafe fn new<F: for<'a> FnOnce(&'a T) -> &'a U>(f: F) -> Self
Construct a field offset via a lambda which returns a reference to the field in question.
The lambda must not access the value passed in.
unsafe fn new_from_offset(offset: usize) -> Self
Construct a field offset directly from a byte offset.
fn apply_ptr<'a>(&self, x: *const T) -> *const U
Apply the field offset to a native pointer.
fn apply_ptr_mut<'a>(&self, x: *mut T) -> *mut U
Apply the field offset to a native mutable pointer.
fn apply<'a>(&self, x: &'a T) -> &'a U
Apply the field offset to a reference.
fn apply_mut<'a>(&self, x: &'a mut T) -> &'a mut U
Apply the field offset to a mutable reference.
fn get_byte_offset(&self) -> usize
Get the raw byte offset for this field offset.
unsafe fn unapply_ptr<'a>(&self, x: *const U) -> *const T
Unapply the field offset to a native pointer.
Warning: very unsafe!
unsafe fn unapply_ptr_mut<'a>(&self, x: *mut U) -> *mut T
Unapply the field offset to a native mutable pointer.
Warning: very unsafe!
unsafe fn unapply<'a>(&self, x: &'a U) -> &'a T
Unapply the field offset to a reference.
Warning: very unsafe!
unsafe fn unapply_mut<'a>(&self, x: &'a mut U) -> &'a mut T
Unapply the field offset to a mutable reference.
Warning: very unsafe!
Trait Implementations
impl<T, U, V> Add<FieldOffset<U, V>> for FieldOffset<T, U>
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Allow chaining pointer-to-members.
Applying the resulting field offset is equivalent to applying the first field offset, then applying the second field offset.
The requirements on the generic type parameters ensure this is a safe operation.
type Output = FieldOffset<T, V>
The resulting type after applying the +
operator
fn add(self, other: FieldOffset<U, V>) -> FieldOffset<T, V>
The method for the +
operator
impl<T, U> Debug for FieldOffset<T, U>
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The debug implementation prints the byte offset of the field in hexadecimal.
impl<T, U> Copy for FieldOffset<T, U>
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impl<T, U> Clone for FieldOffset<T, U>
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fn clone(&self) -> Self
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
1.0.0
Performs copy-assignment from source
. Read more