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use hair::*;
use rustc::hir;
use syntax::ptr::P;
pub trait ToRef {
type Output;
fn to_ref(self) -> Self::Output;
}
impl<'a, 'tcx: 'a> ToRef for &'tcx hir::Expr {
type Output = ExprRef<'tcx>;
fn to_ref(self) -> ExprRef<'tcx> {
ExprRef::Hair(self)
}
}
impl<'a, 'tcx: 'a> ToRef for &'tcx P<hir::Expr> {
type Output = ExprRef<'tcx>;
fn to_ref(self) -> ExprRef<'tcx> {
ExprRef::Hair(&**self)
}
}
impl<'a, 'tcx: 'a> ToRef for Expr<'tcx> {
type Output = ExprRef<'tcx>;
fn to_ref(self) -> ExprRef<'tcx> {
ExprRef::Mirror(Box::new(self))
}
}
impl<'a, 'tcx: 'a, T, U> ToRef for &'tcx Option<T>
where &'tcx T: ToRef<Output = U>
{
type Output = Option<U>;
fn to_ref(self) -> Option<U> {
self.as_ref().map(|expr| expr.to_ref())
}
}
impl<'a, 'tcx: 'a, T, U> ToRef for &'tcx Vec<T>
where &'tcx T: ToRef<Output = U>
{
type Output = Vec<U>;
fn to_ref(self) -> Vec<U> {
self.iter().map(|expr| expr.to_ref()).collect()
}
}
impl<'a, 'tcx: 'a, T, U> ToRef for &'tcx P<[T]>
where &'tcx T: ToRef<Output = U>
{
type Output = Vec<U>;
fn to_ref(self) -> Vec<U> {
self.iter().map(|expr| expr.to_ref()).collect()
}
}