| use crate::hair::*; |
| |
| use rustc::hir; |
| use rustc::hir::ptr::P; |
| |
| pub trait ToRef { |
| type Output; |
| fn to_ref(self) -> Self::Output; |
| } |
| |
| impl<'tcx> ToRef for &'tcx hir::Expr { |
| type Output = ExprRef<'tcx>; |
| |
| fn to_ref(self) -> ExprRef<'tcx> { |
| ExprRef::Hair(self) |
| } |
| } |
| |
| impl<'tcx> ToRef for &'tcx P<hir::Expr> { |
| type Output = ExprRef<'tcx>; |
| |
| fn to_ref(self) -> ExprRef<'tcx> { |
| ExprRef::Hair(&**self) |
| } |
| } |
| |
| impl<'tcx> ToRef for Expr<'tcx> { |
| type Output = ExprRef<'tcx>; |
| |
| fn to_ref(self) -> ExprRef<'tcx> { |
| ExprRef::Mirror(Box::new(self)) |
| } |
| } |
| |
| impl<'tcx, 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<'tcx, 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<'tcx, 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() |
| } |
| } |