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style: Document nsTArray sugar module.

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Emilio Cobos Álvarez 2017-01-02 03:02:52 +01:00
parent 1d19e81c8b
commit 1fc48dc730
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1 changed files with 8 additions and 4 deletions
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12
components/style/gecko_bindings/sugar/ns_t_array.rs
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@ -2,6 +2,8 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! Rust helpers for Gecko's nsTArray.
use gecko_bindings::bindings;
use gecko_bindings::structs::{nsTArray, nsTArrayHeader};
use std::mem;
@ -78,10 +80,12 @@ impl<T> nsTArray<T> {
unsafe { self.clear() }
}
// unsafe because the array may contain uninits
// This will not call constructors, either manually
// add bindings or run the typed ensurecapacity call
// on the gecko side
/// Resize and set the length of the array to `len`.
///
/// unsafe because the array may contain uninitialized members.
///
/// This will not call constructors, if you need that, either manually add
/// bindings or run the typed `EnsureCapacity` call on the gecko side.
pub unsafe fn set_len(&mut self, len: u32) {
// this can leak
debug_assert!(len >= self.len() as u32);