93 lines
2.1 KiB
Rust
93 lines
2.1 KiB
Rust
use std::cell::{Ref, RefMut};
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use anchor_lang::prelude::*;
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/// Header is created by scanning and parsing the dynamic portion of the account.
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/// This stores useful information e.g. offsets to easily seek into dynamic content.
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pub trait DynamicHeader: Sized {
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/// Builds header by scanning and parsing the dynamic portion of the account.
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fn from_bytes(dynamic_data: &[u8]) -> Result<Self>;
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/// initializes a header on the dynamic portion of a new account
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fn initialize(dynamic_data: &mut [u8]) -> Result<()>;
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}
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#[derive(Clone)]
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pub struct DynamicAccount<Header, Fixed, Dynamic> {
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pub header: Header,
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pub fixed: Fixed,
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pub dynamic: Dynamic,
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}
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// Want to generalize over:
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// - T (which is Borrow<T>)
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// - &T (which is Borrow<T> and Deref<Target=T>)
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// - Ref<T> (which is Deref<T>)
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pub trait DerefOrBorrow<T: ?Sized> {
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fn deref_or_borrow(&self) -> &T;
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}
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impl<T: ?Sized> DerefOrBorrow<T> for T {
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fn deref_or_borrow(&self) -> &T {
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self
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}
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}
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impl<T: ?Sized> DerefOrBorrow<T> for &T {
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fn deref_or_borrow(&self) -> &T {
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self
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}
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}
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impl<T: Sized> DerefOrBorrow<[T]> for Vec<T> {
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fn deref_or_borrow(&self) -> &[T] {
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self
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}
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}
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impl<T: ?Sized> DerefOrBorrow<T> for &mut T {
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fn deref_or_borrow(&self) -> &T {
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self
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}
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}
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impl<'a, T: ?Sized> DerefOrBorrow<T> for Ref<'a, T> {
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fn deref_or_borrow(&self) -> &T {
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self
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}
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}
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impl<'a, T: ?Sized> DerefOrBorrow<T> for RefMut<'a, T> {
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fn deref_or_borrow(&self) -> &T {
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self
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}
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}
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pub trait DerefOrBorrowMut<T: ?Sized> {
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fn deref_or_borrow_mut(&mut self) -> &mut T;
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}
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impl<T: ?Sized> DerefOrBorrowMut<T> for T {
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fn deref_or_borrow_mut(&mut self) -> &mut T {
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self
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}
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}
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impl<T: ?Sized> DerefOrBorrowMut<T> for &mut T {
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fn deref_or_borrow_mut(&mut self) -> &mut T {
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self
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}
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}
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impl<'a, T: ?Sized> DerefOrBorrowMut<T> for RefMut<'a, T> {
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fn deref_or_borrow_mut(&mut self) -> &mut T {
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self
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}
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}
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impl<T: Sized> DerefOrBorrowMut<[T]> for Vec<T> {
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fn deref_or_borrow_mut(&mut self) -> &mut [T] {
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self
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}
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}
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