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Merge pull request #200 from Manishearth/consts

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more small const improvements
This commit is contained in:
Manish Goregaokar 2015-08-18 18:41:30 +05:30
commit 7ddc402127
1 changed files with 5 additions and 11 deletions
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16
src/consts.rs
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@ -300,8 +300,8 @@ impl<'c, 'cc> ConstEvalContext<'c, 'cc> {
ExprIf(ref cond, ref then, ref otherwise) =>
self.ifthenelse(&*cond, &*then, &*otherwise),
ExprLit(ref lit) => Some(lit_to_constant(&lit.node)),
ExprVec(ref vec) => self.vec(&vec),
ExprTup(ref tup) => self.tup(&tup),
ExprVec(ref vec) => self.multi(vec).map(ConstantVec),
ExprTup(ref tup) => self.multi(tup).map(ConstantTuple),
ExprRepeat(ref value, ref number) =>
self.binop_apply(value, number, |v, n|
Some(ConstantRepeat(Box::new(v), n.as_u64() as usize))),
@ -318,18 +318,12 @@ impl<'c, 'cc> ConstEvalContext<'c, 'cc> {
}
}
/// create `Some(ConstantVec(..))` of all constants, unless there is any
/// create `Some(Vec![..])` of all constants, unless there is any
/// non-constant part
fn vec<E: Deref<Target=Expr> + Sized>(&mut self, vec: &[E]) -> Option<Constant> {
fn multi<E: Deref<Target=Expr> + Sized>(&mut self, vec: &[E]) ->
Option<Vec<Constant>> {
vec.iter().map(|elem| self.expr(elem))
.collect::<Option<_>>()
.map(ConstantVec)
}
fn tup<E: Deref<Target=Expr> + Sized>(&mut self, tup: &[E]) -> Option<Constant> {
tup.iter().map(|elem| self.expr(elem))
.collect::<Option<_>>()
.map(ConstantTuple)
}
/// lookup a possibly constant expression from a ExprPath