src/librustc_mir/hair/cx/to_ref.rs

   1 use crate::hair::*;
   2
   3 use rustc::hir;
   4 use syntax::ptr::P;
   5
   6 pub trait ToRef {
   7     type Output;
   8     fn to_ref(self) -> Self::Output;
   9 }
  10
  11 impl<'a, 'tcx: 'a> ToRef for &'tcx hir::Expr {
  12     type Output = ExprRef<'tcx>;
  13
  14     fn to_ref(self) -> ExprRef<'tcx> {
  15         ExprRef::Hair(self)
  16     }
  17 }
  18
  19 impl<'a, 'tcx: 'a> ToRef for &'tcx P<hir::Expr> {
  20     type Output = ExprRef<'tcx>;
  21
  22     fn to_ref(self) -> ExprRef<'tcx> {
  23         ExprRef::Hair(&**self)
  24     }
  25 }
  26
  27 impl<'a, 'tcx: 'a> ToRef for Expr<'tcx> {
  28     type Output = ExprRef<'tcx>;
  29
  30     fn to_ref(self) -> ExprRef<'tcx> {
  31         ExprRef::Mirror(Box::new(self))
  32     }
  33 }
  34
  35 impl<'a, 'tcx: 'a, T, U> ToRef for &'tcx Option<T>
  36     where &'tcx T: ToRef<Output = U>
  37 {
  38     type Output = Option<U>;
  39
  40     fn to_ref(self) -> Option<U> {
  41         self.as_ref().map(|expr| expr.to_ref())
  42     }
  43 }
  44
  45 impl<'a, 'tcx: 'a, T, U> ToRef for &'tcx Vec<T>
  46     where &'tcx T: ToRef<Output = U>
  47 {
  48     type Output = Vec<U>;
  49
  50     fn to_ref(self) -> Vec<U> {
  51         self.iter().map(|expr| expr.to_ref()).collect()
  52     }
  53 }
  54
  55 impl<'a, 'tcx: 'a, T, U> ToRef for &'tcx P<[T]>
  56     where &'tcx T: ToRef<Output = U>
  57 {
  58     type Output = Vec<U>;
  59
  60     fn to_ref(self) -> Vec<U> {
  61         self.iter().map(|expr| expr.to_ref()).collect()
  62     }
  63 }