1  // Copyright (c) 2019-2025 Alpha-Delta Network Inc.
 2  // This file is part of the deltavm library.
 3  
 4  // Licensed under the Apache License, Version 2.0 (the "License");
 5  // you may not use this file except in compliance with the License.
 6  // You may obtain a copy of the License at:
 7  
 8  // http://www.apache.org/licenses/LICENSE-2.0
 9  
10  // Unless required by applicable law or agreed to in writing, software
11  // distributed under the License is distributed on an "AS IS" BASIS,
12  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  // See the License for the specific language governing permissions and
14  // limitations under the License.
15  
16  use crate::r1cs::errors::SynthesisError;
17  
18  pub trait Assignment<T> {
19      fn get(self) -> Result<T, SynthesisError>;
20  
21      fn get_ref(&self) -> Result<&T, SynthesisError>;
22  }
23  
24  impl<T> Assignment<T> for Option<T> {
25      fn get(self) -> Result<T, SynthesisError> {
26          match self {
27              Some(v) => Ok(v),
28              None => Err(SynthesisError::AssignmentMissing),
29          }
30      }
31  
32      fn get_ref(&self) -> Result<&T, SynthesisError> {
33          match *self {
34              Some(ref v) => Ok(v),
35              None => Err(SynthesisError::AssignmentMissing),
36          }
37      }
38  }