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tutorial: cleaner libc use statements + mention Drop's Owned restriction #5610

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tutorial: cleaner libc use statements + mention Drop's Owned restriction #5610

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tutorial: cleaner libc use statements
thestinger Mar 28, 2013
d4509f2
tutorial: only Owned types can have a Drop impl
thestinger Mar 28, 2013
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11 changes: 5 additions & 6 deletions doc/tutorial.md
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Expand Up @@ -875,8 +875,7 @@ the compiler that unsafety does not leak outside of the unsafe block, and is
used to create safe concepts on top of low-level code.

~~~~
use core::libc::funcs::c95::stdlib::{calloc, free};
use core::libc::types::os::arch::c95::size_t;
use core::libc::{calloc, free, size_t};

fn main() {
unsafe {
Expand Down Expand Up @@ -909,9 +908,7 @@ The unsafe code from above can be contained behind a safe API that prevents
memory leaks or use-after-free:

~~~~
use core::libc::funcs::c95::stdlib::{calloc, free};
use core::libc::types::common::c95::c_void;
use core::libc::types::os::arch::c95::size_t;
use core::libc::{calloc, free, c_void, size_t};

struct Blob { priv ptr: *c_void }

Expand Down Expand Up @@ -985,7 +982,9 @@ when it is collected.

If an object doesn't contain garbage-collected boxes, it consists of a single
ownership tree and is given the `Owned` trait which allows it to be sent
between tasks.
between tasks. Custom destructors can only be implemented directly on types
that are `Owned`, but garbage-collected boxes can still *contain* types with
custom destructors.

# Boxes

Expand Down