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#ifndef OPERATOR_HPP
#define OPERATOR_HPP
#include <cassert>
#include <vector>
template<typename Domain>
struct Operator {
virtual ~Operator() { }
virtual Domain eval(const std::vector<Domain>&) const = 0;
virtual void print(std::ostream&) const = 0;
};
template<typename Domain>
struct Maximum : public Operator<Domain> {
virtual Domain eval(const std::vector<Domain>& arguments) const {
Domain result = -infinity<Domain>();
for (typename std::vector<Domain>::const_iterator it = arguments.begin();
it != arguments.end();
++it) {
result = (result < *it ? *it : result);
}
return result;
}
void print(std::ostream& cout) const {
cout << "max";
}
};
template<typename Domain>
struct Minimum : public Operator<Domain> {
virtual Domain eval(const std::vector<Domain>& arguments) const {
Domain result = infinity<Domain>();
for (typename std::vector<Domain>::const_iterator it = arguments.begin();
it != arguments.end();
++it) {
result = (*it < result ? *it : result);
}
return result;
}
void print(std::ostream& cout) const {
cout << "min";
}
};
template<typename Domain>
struct Negation : public Operator<Domain> {
virtual Domain eval(const std::vector<Domain>& arguments) const {
assert(arguments.size() == 1);
return -arguments[0];
}
void print(std::ostream& cout) const {
cout << "-";
}
};
template<typename Domain>
struct Addition : public Operator<Domain> {
virtual Domain eval(const std::vector<Domain>& arguments) const {
Domain result = 0;
for (typename std::vector<Domain>::const_iterator it = arguments.begin();
it != arguments.end();
++it) {
result += *it;
}
return result;
}
void print(std::ostream& cout) const {
cout << "add";
}
};
template<typename Domain>
struct Subtraction : public Operator<Domain> {
virtual Domain eval(const std::vector<Domain>& arguments) const {
Domain result = 0;
for (typename std::vector<Domain>::const_iterator it = arguments.begin();
it != arguments.end();
++it) {
if (it == arguments.begin())
result = *it;
else
result -= *it;
}
return result;
}
void print(std::ostream& cout) const {
cout << "sub";
}
};
template<typename Domain>
struct Multiplication : public Operator<Domain> {
virtual Domain eval(const std::vector<Domain>& arguments) const {
Domain result = 1;
for (typename std::vector<Domain>::const_iterator it = arguments.begin(),
end = arguments.end();
it != end;
++it) {
result *= *it;
}
return result;
}
void print(std::ostream& cout) const {
cout << "mult";
}
};
template<typename Domain>
struct Comma : public Operator<Domain> {
virtual Domain eval(const std::vector<Domain>& arguments) const {
if (arguments[0] == -infinity<Domain>()) {
return -infinity<Domain>();
}
return arguments[1];
}
void print(std::ostream& cout) const {
cout << "comma";
}
};
template<typename Domain>
struct Guard : public Operator<Domain> {
virtual Domain eval(const std::vector<Domain>& arguments) const {
Domain result = arguments[2];
if (arguments[0] < arguments[1]) {
result = -infinity<Domain>();
}
return result;
}
void print(std::ostream& cout) const {
cout << "guard";
}
};
#include "MCFSimplex.h"
template<typename Domain>
struct MinCostFlow : public Operator<Domain> {
MinCostFlow(const std::vector<Domain>& supplies, const std::vector<std::pair<int,int> > arcs)
: _supplies(supplies), _arcs(arcs), _solver(0,0) {
MCFClass::FNumber* deficits = new MCFClass::FNumber[supplies.size()];
MCFClass::Index* starts = new MCFClass::Index[arcs.size()];
MCFClass::Index* ends = new MCFClass::Index[arcs.size()];
for (int i = 0, size = supplies.size(); i < size; ++i) {
deficits[i] = -supplies[i].template as<MCFClass::FNumber>();
}
for (int i = 0, size = arcs.size(); i < size; ++i) {
starts[i] = arcs[i].first;
ends[i] = arcs[i].second;
}
_solver.LoadNet(supplies.size(), supplies.size(), // max nodes/arcs
supplies.size(), supplies.size(), // current nodes/arcs
NULL, NULL, // arcs have inf cap, zero cost (to begin)
deficits, // deficits for each node
starts, ends); // start/end of each edge
delete[] deficits;
delete[] starts;
delete[] ends;
}
Domain eval (const std::vector<Domain>& costs) const {
assert(costs.size() == _arcs.size());
if (costs.size() == 0)
return 0;
for (int i = 0, size = costs.size(); i < size; ++i) {
_solver.ChgCost(i, costs[i].template as<MCFClass::CNumber>());
}
_solver.SolveMCF();
if (_solver.MCFGetStatus() == MCFClass::kUnfeasible){
return -infinity<Domain>();
} else if (_solver.MCFGetFO() == MCFClass::Inf<MCFClass::FONumber>()) {
return infinity<Domain>();
} else if (_solver.MCFGetFO() == -MCFClass::Inf<MCFClass::FONumber>()) {
return -infinity<Domain>();
} else {
return _solver.MCFGetFO();
}
}
void print(std::ostream& cout) const {
std::string supplyString = "[";
for (int i = 0, size = _supplies.size(); i < size; ++i) {
if (i > 0)
supplyString += ",";
std::stringstream stream;
stream << _supplies[i];
supplyString += stream.str();
}
supplyString += ']';
std::string arcString = "[";
for (int i = 0, size = _arcs.size(); i < size; ++i) {
if (i > 0)
arcString += ",";
{
std::stringstream stream;
stream << _arcs[i].first;
arcString += stream.str() + ":";
}
{
std::stringstream stream;
stream << _arcs[i].second;
arcString += stream.str();
}
}
arcString += ']';
cout << "MCF<" << supplyString << "," << arcString << ">";
}
private:
std::vector<Domain> _supplies;
std::vector<std::pair<int,int> > _arcs;
mutable MCFSimplex _solver;
};
/*#include "TemplateConstraintMatrix.hpp"
template<typename Domain>
struct MinimumCostFlow : public Operator<Domain> {
MinimumCostFlow() {
}
Domain solve(const Domain& d) const {
}
virtual Domain eval(const std::vector<Domain>& arguments) const {
if (arguments.size() != 1)
throw "Incorrect number of arguments.";
return solve(arguments[0]);
}
void print(std::ostream& cout) const {
cout << "minCostFlow";
}
private:
TemplateConstraintMatrix& constraint; // T
std::vector<Domain> guard; // c
std::vector<std::vector<Domain>> multiplication; //A
unsigned int row;
};*/
template<typename T>
std::ostream& operator<<(std::ostream& cout, const Operator<T>& op) {
op.print(cout);
return cout;
}
#endif
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