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/********************* */
/*! \file cdmaybe.h
** \verbatim
** Top contributors (to current version):
** Tim King
** This file is part of the CVC4 project.
** Copyright (c) 2009-2020 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.\endverbatim
**
** \brief 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 CVC4 {
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> */
}/* CVC4::context namespace */
}/* CVC4 namespace */
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