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/******************************************************************************
* Top contributors (to current version):
* Tim King
*
* This file is part of the cvc5 project.
*
* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
* in the top-level source directory and their institutional affiliations.
* All rights reserved. See the file COPYING in the top-level source
* directory for licensing information.
* ****************************************************************************
* A context-dependent "maybe" template type
*
* This implements a CDMaybe.
* This has either been set in the context or it has not.
* Template parameter T must have a default constructor and support
* assignment.
*/
#include "cvc4_private.h"
#pragma once
#include "context/cdo.h"
#include "context/context.h"
namespace cvc5 {
namespace context {
class CDRaised {
private:
context::CDO<bool> d_flag;
public:
CDRaised(context::Context* c)
: d_flag(c, false)
{}
bool isRaised() const {
return d_flag.get();
}
void raise(){
Assert(!isRaised());
d_flag.set(true);
}
};/* class CDRaised */
template <class T>
class CDMaybe {
private:
typedef std::pair<bool, T> BoolTPair;
context::CDO<BoolTPair> d_data;
public:
CDMaybe(context::Context* c) : d_data(c, std::make_pair(false, T()))
{}
bool isSet() const {
return d_data.get().first;
}
void set(const T& d){
Assert(!isSet());
d_data.set(std::make_pair(true, d));
}
const T& get() const{
Assert(isSet());
return d_data.get().second;
}
};/* class CDMaybe<T> */
} // namespace context
} // namespace cvc5
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