src/test/run-pass/allocator/auxiliary/custom.rs

   1 // Copyright 2017 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // no-prefer-dynamic
  12
  13 #![feature(heap_api, allocator_api)]
  14 #![crate_type = "rlib"]
  15
  16 use std::heap::{Alloc, System, AllocErr, Layout};
  17 use std::sync::atomic::{AtomicUsize, Ordering};
  18
  19 pub struct A(pub AtomicUsize);
  20
  21 unsafe impl<'a> Alloc for &'a A {
  22     unsafe fn alloc(&mut self, layout: Layout) -> Result<*mut u8, AllocErr> {
  23         self.0.fetch_add(1, Ordering::SeqCst);
  24         System.alloc(layout)
  25     }
  26
  27     unsafe fn dealloc(&mut self, ptr: *mut u8, layout: Layout) {
  28         self.0.fetch_add(1, Ordering::SeqCst);
  29         System.dealloc(ptr, layout)
  30     }
  31 }