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// Substitution (expression distribution for variables) -*- c++ -*-
#ifndef SUBSTITUTION_H_
# define SUBSTITUTION_H_
# ifdef __GNUC__
# pragma interface
# endif // __GNUC__
# include <map>
#include <cstddef>
/** @file Substitution.h
* Map from variables (quantifiers or function parameters) to expressions
*/
/* Copyright 1999-2001 Marko Mkel (msmakela@tcs.hut.fi).
This file is part of MARIA, a reachability analyzer and model checker
for high-level Petri nets.
MARIA is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
MARIA is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
The GNU General Public License is often shipped with GNU software, and
is generally kept in a file called COPYING or LICENSE. If you do not
have a copy of the license, write to the Free Software Foundation,
59 Temple Place, Suite 330, Boston, MA 02111 USA. */
/** Substitution (expression distribution for variables) */
class Substitution
{
/** Pointer comparator */
struct vptr
{
bool operator () (const class VariableDefinition* v1,
const class VariableDefinition* v2) const {
return v1 < v2;
}
};
/** Map from variable definitions to expressions */
typedef std::map<const class VariableDefinition*,class Expression*,vptr> Map;
/** Iterator to the map */
typedef Map::iterator iterator;
/** Constant iterator to the map */
typedef Map::const_iterator const_iterator;
public:
/** Constructor */
Substitution ();
private:
/** Copy constructor */
Substitution (const class Substitution& old);
/** Assignment operator */
class Substitution& operator= (const class Substitution& old);
public:
/** Destructor */
~Substitution ();
/** Get the expression of a variable
* @param var identifies the variable
* @return the expression, or NULL if there is none
*/
const class Expression* getExpr (const class VariableDefinition& var) const {
const_iterator i = myExprs.find (&var);
return i == myExprs.end () ? NULL : i->second;
}
/** Get the expression of a variable
* @param var identifies the variable
* @return the expression, or NULL if there is none
*/
class Expression* getExpr (const class VariableDefinition& var);
/** Assign an expression to a variable.
* @param var identifies the variable
* @param expr expression to be assigned
*/
void setExpr (const class VariableDefinition& var, class Expression& expr);
private:
/** The expressions sorted by variables */
Map myExprs;
};
#endif // SUBSTITUTION_H_
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