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BlackLight 2010-05-24 02:47:06 +02:00
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276
csp++.cpp
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@ -1,276 +0,0 @@
/*
* =====================================================================================
*
* Filename: csp++.cpp
*
* Description:
*
* Version: 1.0
* Created: 17/05/2010 09:17:13
* Revision: none
* Compiler: gcc
*
* Author: BlackLight (http://0x00.ath.cx), <blacklight@autistici.org>
* Company: lulz
*
* =====================================================================================
*/
#include <iostream>
#include <algorithm>
#include "csp++.h"
using namespace std;
// using std::vector;
template<class T>
void
CSP<T>::__init (int n, bool (*c)(vector< CSPvariable<T> >))
{
variables = vector< CSPvariable<T> >(n);
fixed = vector<bool>(n);
__default_domains = vector< vector<T> >(n);
for (size_t i=0; i < variables.size(); i++) {
variables[i].index = i;
variables[i].fixed = false;
// TODO Remove this line
fixed[i] = false;
}
constraints = vector< bool (*)(std::vector< CSPvariable<T> >) >(1);
constraint = c;
__has_default_value = false;
}
template<class T>
CSP<T>::CSP (int n, bool (*c)(vector< CSPvariable<T> >))
{
__init (n, c);
}
template<class T>
CSP<T>::CSP ( int n, T default_value, bool set_value, bool (*c)(std::vector< CSPvariable<T> >) )
{
__init (n, c);
for ( size_t i=0; i < variables.size(); i++ ) {
variables[i].value = default_value;
variables[i].fixed = set_value;
// TODO Remove this line
fixed[i] = set_value;
}
__default_value = default_value;
__has_default_value = true;
}
template<class T>
void
CSP<T>::setDomain (size_t index, vector<T> domain)
{
if (index >= variables.size())
throw CSPexception("Index out of range");
variables[index].domain = domain;
__default_domains[index] = domain;
}
template<class T>
void
CSP<T>::setDomain (size_t index, T domain[], int size)
{
if (index >= variables.size())
throw CSPexception("Index out of range");
if (size < 0)
throw CSPexception("Invalid domain size");
variables[index].domain = vector<T>(size);
for (int i=0; i < size; i++) {
variables[index].domain[i] = domain[i];
__default_domains[index].push_back(domain[i]);
}
}
template<class T>
void
CSP<T>::setConstraint ( bool (*c)(vector< CSPvariable<T> >))
{
constraints = vector< bool(*)(vector< CSPvariable<T > >) >(1);
constraint = c;
}
template<class T>
void
CSP<T>::setConstraint ( std::vector< bool(*)(std::vector< CSPvariable<T> >) > c )
{
constraints = c;
}
template<class T>
void
CSP<T>::appendConstraint ( bool (*c)(vector< CSPvariable<T> >))
{
constraints.push_back(c);
}
template<class T>
void
CSP<T>::dropConstraint ( size_t index )
{
if (index >= constraints.size())
throw CSPexception("Index out of range");
constraints.erase( constraints.begin() + index );
}
template<class T>
void
CSP<T>::restoreDomains ( void )
{
for (int i=0; i < variables.size(); i++)
variables[i].domain = __default_domains[i];
}
template<class T>
void
CSP<T>::refreshDomains ( void )
{
vector< arc<T> > arcs;
restoreDomains();
for (typename vector< CSPvariable<T> >::iterator x = variables.begin(); x != variables.end(); x++) {
for (typename vector< CSPvariable<T> >::iterator y = variables.begin(); y != variables.end(); y++) {
for (size_t i=0; i < x->domain.size(); i++) {
if ( x->fixed ) {
// TODO Remove this line
// if ( fixed[ x - variables.begin() ] ) {
if ( x->domain[i] != x->value )
continue;
}
x->value = x->domain[i];
for (size_t j=0; j < y->domain.size(); j++) {
if ( y->fixed ) {
// TODO Remove this line
// if ( fixed[ y - variables.begin() ] ) {
if ( y->domain[j] != y->value )
continue;
}
y->value = y->domain[j];
bool isConfigurationValid = true;
for ( typename std::vector< bool (*)(std::vector< CSPvariable<T> >) >::iterator c = constraints.begin();
c != constraints.end() && isConfigurationValid;
c++ ) {
if (!(*c)(variables))
isConfigurationValid = false;
}
if (isConfigurationValid) {
arc<T> a;
a.var[0] = *x; a.var[1] = *y;
a.value[0] = x->value; a.value[1] = y->value;
arcs.push_back(a);
}
}
}
}
vector<T> domain = vector<T>();
for (size_t i=0; i < arcs.size(); i++) {
if (arcs[i].var[0].index == x->index ||
arcs[i].var[1].index == x->index) {
T value = (arcs[i].var[0].index == x->index) ? arcs[i].value[0] : arcs[i].value[1];
bool found = false;
for (size_t j=0; j < domain.size() && !found; j++) {
if (domain[j] == value)
found = true;
}
if (!found) {
domain.push_back(value);
}
}
}
sort(domain.begin(), domain.end());
x->domain = domain;
}
}
template<class T>
std::vector<T>
CSP<T>::getDomain ( size_t index )
{
if (index >= variables.size())
throw CSPexception("Index out of range");
return variables[index].domain;
}
template<class T>
size_t
CSP<T>::getSize( void )
{
return variables.size();
}
template<class T>
void
CSP<T>::setValue ( size_t index, T value )
{
if (index >= variables.size())
throw CSPexception("Index out of range");
variables[index].value = value;
variables[index].fixed = true;
// TODO Remove this line
// fixed[index] = true;
}
template<class T>
void
CSP<T>::unsetValue ( size_t index )
{
if (index >= variables.size())
throw CSPexception("Index out of range");
if (__has_default_value)
variables[index].value = __default_value;
variables[index].fixed = false;
// TODO Remove this line
// fixed[index] = false;
}
template<class T>
bool
CSP<T>::isSatisfiable ( void )
{
for ( size_t i=0; i < variables.size(); i++ ) {
if ( variables[i].domain.empty() )
return false;
}
return true;
}
template<class T>
bool
CSP<T>::hasUniqueSolution ( void )
{
for ( size_t i=0; i < variables.size(); i++ ) {
if (variables[i].domain.size() != 1)
return false;
}
return true;
}

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csp++.h
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/*
* =====================================================================================
*
* Filename: csp++.h
*
* Description:
*
* Version: 1.0
* Created: 16/05/2010 23:16:42
* Revision: none
* Compiler: gcc
*
* Author: BlackLight (http://0x00.ath.cx), <blacklight@autistici.org>
* Company: lulz
*
* =====================================================================================
*/
#ifndef __CSPPP_H
#define __CSPPP_H
#include <vector>
#include <exception>
template<class T>
struct CSPvariable {
int index;
bool fixed;
T value;
std::vector<T> domain;
};
/**
* \class CSPexception csp++.h
* \brief Class for managing exception in CSP
*/
class CSPexception : public std::exception {
const char* message;
public:
CSPexception (const char *m) {
message = m;
}
virtual const char* what() {
return message;
}
};
/**
* \class CSP csp++.h
* \brief Main class for managing a CSP
*/
template<class T>
class CSP {
private:
template<class TT>
struct arc {
CSPvariable<TT> var[2];
TT value[2];
};
std::vector<bool> fixed;
std::vector< CSPvariable<T> > variables;
std::vector< bool (*)(std::vector< CSPvariable<T> >) > constraints;
#define constraint constraints[0]
std::vector< std::vector<T> > __default_domains;
T __default_value;
bool __has_default_value;
static bool __default_constraint ( std::vector< CSPvariable<T> > v ) { return true; }
void __init ( int n, bool (*c)(std::vector< CSPvariable<T> >) );
void restoreDomains ( void );
public:
/**
* \brief Class constructor
* \param n Number of variables in the CSP
* \param c Boolean function representing the constraint of the CSP
* If no constraint function is set in the constructor or
* using the applyConstraint() method, a default function
* always returning true will be used, that allows any
* domain for any variable to be valid (no constraint)
*/
CSP ( int n, bool (*c)(std::vector< CSPvariable<T> >) = __default_constraint );
/**
* \brief Class constructor
* \param n Number of variables in the CSP
* \param default_value Default value for the variables in the CSP
* when initialized
* \param set_variables Decide whether mark the variables set with
* default_value as "set" or "not set" (default: not set)
* \param c Boolean function representing the constraint of the CSP
* If no constraint function is set in the constructor or
* using the applyConstraint() method, a default function
* always returning true will be used, that allows any
* domain for any variable to be valid (no constraint)
*/
CSP ( int n, T default_value, bool set_variables = false, bool (*c)(std::vector< CSPvariable<T> >) = __default_constraint );
/**
* METHOD: setDomain
* \brief Set the domain for the i-th variable
* \param index Variable for which we're setting the domain
* \param domain Vector containing the possible values for that variable
*/
void setDomain ( size_t index, std::vector<T> domain );
/**
* METHOD: setDomain
* \brief Set the domain for the i-th variable
* \param index Variable for which we're setting the domain
* \param domain Array containing the possible values for that variable
* \param size Size of "domain" array
*/
void setDomain ( size_t index, T domain[], int size );
/**
* METHOD: setConstraint
* \brief Apply the constraint to the CSP as a boolean function
* \param c Boolean function representing the constraint of the CSP
*/
void setConstraint ( bool (*c)(std::vector< CSPvariable<T> >) );
/**
* METHOD: setConstraint
* \brief Apply the constraints to the CSP as vector of boolean functions
* \param c Vector containing pointers to boolean functions representing
* the constraints of the CSP
*/
void setConstraint ( std::vector< bool(*)(std::vector< CSPvariable<T> >) > c );
/**
* METHOD: dropConstraint
* \brief Drops a constraint from the CSP
* \param index Index of the constraint to be dropped
*/
void dropConstraint ( size_t index );
/**
* METHOD: appendConstraint
* \brief Append a constraint to the list of the constraint of the CSP
* \param c A function pointer returning a boolean value representing the new constraint
*/
void appendConstraint ( bool (*c)(std::vector< CSPvariable<T> >) );
/**
* METHOD: refreshDomains
* \brief Updates the domains of the variables. Any constraint or node fixed value is applied
*/
void refreshDomains( void );
/**
* METHOD: getDomain
* \brief Get the domain of the i-th variable
* \param index Variable for which we're going to get the domain
* \return The domain of the i-th variable as a vector of T
*/
std::vector<T> getDomain ( size_t index );
/**
* METHOD: getSize
* \brief Get the number of variables in the current CSP
* \return Size of the CSP
*/
size_t getSize ( void );
/**
* METHOD: setValue
* \brief Set the value of a variable as a constraint
* \param index Index of the parameter to be set
* \param value Value to be set
*/
void setValue ( size_t index, T value );
/**
* METHOD: unsetValue
* \brief Marks a variable as not set, and if a default value was assigned
* in the CSP constructor, this value will be set. By default, unless
* specified in the constructor, all the variables are considered as
* not set
* \param index Index of the variable to be unset
*/
void unsetValue ( size_t index );
/**
* METHOD: isSatisfiable
* \brief Check if the current CSP, with the applied constraints, is satisfiable
* \return true if the CSP has at least a possible solution, false otherwise
*/
bool isSatisfiable ( void );
/**
* METHOD: hasUniqueSolution
* \brief Check if the CSP, with the given variables, domains and constraints,
* admits a unique solution, i.e. each domain of each variable contains
* an only element
* \return true if the CSP has an only possible solution, false otherwise
*/
bool hasUniqueSolution ( void );
};
#endif