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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use infer::InferCtxt;
use ty::{self, Ty, TyCtxt};
use hir::def_id::DefId;
use super::{FulfillmentContext, FulfillmentError};
use super::{ObligationCause, PendingPredicateObligation, PredicateObligation};
pub trait TraitEngine<'tcx>: 'tcx {
fn normalize_projection_type<'a, 'gcx>(
&mut self,
infcx: &InferCtxt<'a, 'gcx, 'tcx>,
param_env: ty::ParamEnv<'tcx>,
projection_ty: ty::ProjectionTy<'tcx>,
cause: ObligationCause<'tcx>,
) -> Ty<'tcx>;
fn register_bound<'a, 'gcx>(
&mut self,
infcx: &InferCtxt<'a, 'gcx, 'tcx>,
param_env: ty::ParamEnv<'tcx>,
ty: Ty<'tcx>,
def_id: DefId,
cause: ObligationCause<'tcx>,
);
fn register_predicate_obligation<'a, 'gcx>(
&mut self,
infcx: &InferCtxt<'a, 'gcx, 'tcx>,
obligation: PredicateObligation<'tcx>,
);
fn select_all_or_error<'a, 'gcx>(
&mut self,
infcx: &InferCtxt<'a, 'gcx, 'tcx>,
) -> Result<(), Vec<FulfillmentError<'tcx>>>;
fn select_where_possible<'a, 'gcx>(
&mut self,
infcx: &InferCtxt<'a, 'gcx, 'tcx>,
) -> Result<(), Vec<FulfillmentError<'tcx>>>;
fn pending_obligations(&self) -> Vec<PendingPredicateObligation<'tcx>>;
}
impl<'a, 'gcx, 'tcx> dyn TraitEngine<'tcx> {
pub fn new(_tcx: TyCtxt<'_, '_, 'tcx>) -> Box<Self> {
Box::new(FulfillmentContext::new())
}
pub fn register_predicate_obligations<I>(
&mut self,
infcx: &InferCtxt<'a, 'gcx, 'tcx>,
obligations: I,
) where
I: IntoIterator<Item = PredicateObligation<'tcx>>,
{
for obligation in obligations {
self.register_predicate_obligation(infcx, obligation);
}
}
}
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