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mrustc (master)
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use std:: { rc::Rc , sync::{Arc, Mutex, RwLock} , cell::{ Cell, RefCell } }; fn main() { type T = i32; type V = Vec<T>; // mutable value let mut valm: T = 1; let mut valm_the_other = 2; // const ref -> mutable value let refc_valm: &mut T = &mut valm; *refc_valm = 11; // const ptr -> const value let refc_valc: &T = &valm; println!("{} <-- It's a const value via const ref.", refc_valc); // mutable ptr -> mutable value; deref-ptr is an unsafe operation let mut ptrm_valm: *mut T = &mut valm as *mut T; unsafe { *ptrm_valm = 21 }; ptrm_valm = &mut valm_the_other as &mut T; unsafe { *ptrm_valm = 22 }; // const ptr -> mutable value let ptrc_valm: *mut T = &mut valm as *mut i32; unsafe { *ptrc_valm = 31 }; // const ptr -> const value let ptrc_valc: *const T = &valm as *const i32; println!("{:?} <-- It's a const value via const ptr.", ptrc_valc); // heap, ≈ new of C++ let mut ptrm_heap_static_lifetime: *mut T = unsafe{ std::alloc::alloc( std::alloc::Layout::new::<T>() ) } as *mut T; unsafe { *ptrm_heap_static_lifetime = -10 }; // heap, ≈ std::unique_ptr<T> of C++, deref -> mutable value let mut ptrm_heap_single_owner_valm: Box<T> = Box::<T>::new(-1); *ptrm_heap_single_owner_valm = -100; // heap, ≈ std::unique_ptr<const T> of C++, deref -> mutable value let ptrm_heap_single_owner_valc: Box<T> = Box::<T>::new(-1); // heap, ≈ std::shared_ptr<const T> of C++, deref -> const value let ptrm_heap_multiple_owner_thread_unsafe_valc: Rc<T> = Rc::<T>::new(-1); // heap, ≈ std::shared_ptr<T> + std::mutex of C++, deref -> mutable value let ptrm_heap_multiple_owner_thread_unsafe_valm: Rc<Cell<T>> = Rc::new(Cell::<T>::new(-1)); ptrm_heap_multiple_owner_thread_unsafe_valm.set( -200 ); // heap, ≈ std::shared_ptr<T> + std::mutex of C++, deref -> mutable ref let ptrm_heap_multiple_owner_thread_unsafe_refm: Rc<RefCell<V>> = Rc::new(RefCell::new(V::new())); ptrm_heap_multiple_owner_thread_unsafe_refm.borrow_mut().push( -2000 ); // heap, ≈ std::shared_ptr<const T> of C++, deref -> const value let ptrm_heap_multiple_owner_thread_unsafe_valc: Arc<T> = Arc::<T>::new(-1); // heap, ≈ std::shared_ptr<T> + std::shared_mutex of C++, deref -> mutable value let ptrm_heap_multiple_owner_thread_unsafe_valm: Arc<Mutex<T>> = Arc::new(Mutex::<T>::new(-1)); *ptrm_heap_multiple_owner_thread_unsafe_valm.lock().unwrap() = -200; // heap, ≈ std::shared_ptr<T> + std::shared_mutex of C++, deref -> mutable ref let ptrm_heap_multiple_owner_thread_unsafe_refm: Arc<RwLock<T>> = Arc::new(RwLock::<T>::new(-1)); { let r0 = *ptrm_heap_multiple_owner_thread_unsafe_refm.read().unwrap(); let r1 = *ptrm_heap_multiple_owner_thread_unsafe_refm.read().unwrap(); println!("r0 = {:?}, r1 = {:?}", r0, r1); // drop(≈release) r0, r1 then it will be writable in the out of this scope } *ptrm_heap_multiple_owner_thread_unsafe_refm.write().unwrap() = -3000; }
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