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auto merge of #1947 : saneyuki/servo/cast, r=jdm

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follow up https://github.com/mozilla/servo/pull/1864#issuecomment-37109672
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bors-servo 2014-03-23 11:46:47 -04:00
commit e67d8a4003
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3
src/components/script/dom/bindings/codegen/CodegenRust.py
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@ -5745,10 +5745,12 @@ class GlobalGenRoots():
derived += [CGGeneric('\n')]
cast = [CGGeneric(string.Template('''pub trait ${castTraitName} {
#[inline(always)]
fn from<T: ${fromBound}>(derived: &JS<T>) -> JS<Self> {
unsafe { derived.clone().transmute() }
}
#[inline(always)]
fn to<T: ${toBound}>(base: &JS<T>) -> Option<JS<Self>> {
match base.get().${checkFn}() {
true => unsafe { Some(base.clone().transmute()) },
@ -5756,6 +5758,7 @@ class GlobalGenRoots():
}
}
#[inline(always)]
unsafe fn to_unchecked<T: ${toBound}>(base: &JS<T>) -> JS<Self> {
assert!(base.get().${checkFn}());
base.clone().transmute()