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use std::ops::Deref; use std::ops::DerefMut; #[derive(Clone, Copy)] pub struct ValueCache<T>{ has_changed: bool, value: T, } impl<T> ValueCache<T>{ #[inline] pub fn new(t: T) -> ValueCache<T>{ ValueCache{ has_changed: true, value: t } } #[inline] pub fn set(&mut self, t: T){ self.has_changed = true; self.value = t; } #[inline] pub fn as_ref(&self) -> &T{ &self.value } #[inline] pub fn as_mut(&mut self) -> &mut T{ self.has_changed = true; &mut self.value } #[inline] pub fn has_changed(&self) -> bool{ self.has_changed } #[inline] pub fn update(&mut self){ self.has_changed = false; } } impl<T> Deref for ValueCache<T>{ type Target = T; #[inline] fn deref(&self) -> &T{ self.as_ref() } } impl<T> DerefMut for ValueCache<T>{ #[inline] fn deref_mut(&mut self) -> &mut T{ self.as_mut() } }