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#ifndef OPERATOR_HPP
#define OPERATOR_HPP
template<typename T>
T infinity() { }
template<>
float infinity() {
return INFINITY;
}
#include <vector>
template<typename T>
struct VariableAssignment;
template<typename T>
struct Expression;
template<typename T>
struct Operator {
virtual T operator() (const std::vector< Expression<T>* >&, const VariableAssignment<T>&) const = 0;
};
template<typename T>
struct Maximum : public Operator<T> {
virtual T operator() (const std::vector< Expression<T>* >& args, const VariableAssignment<T>& assignment) const {
T value = -infinity<T>();
for (typename std::vector< Expression<T>* >::const_iterator it = args.begin();
it != args.end();
++it) {
T temporary = (**it)(assignment);
value = (temporary < value ? value : temporary);
}
return value;
}
};
template<typename T>
struct Minimum : public Operator<T> {
virtual T operator() (const std::vector< Expression<T>* >& args, const VariableAssignment<T>& assignment) const {
T value = infinity<T>();
for (typename std::vector< Expression<T>* >::const_iterator it = args.begin();
it != args.end();
++it) {
T temporary = (**it)(assignment);
value = (temporary > value ? value : temporary);
}
return value;
}
};
template<typename T>
struct Constant : public Operator<T> {
Constant(const T& val)
: _value(val) { }
T operator() (const std::vector< Expression<T>* >& args, const VariableAssignment<T>& ass) const {
return _value;
}
private:
const T _value;
};
template<typename T>
struct Addition: public Operator<T> {
T operator() (const std::vector< Expression<T>* >& args, const VariableAssignment<T>& ass) const {
T sum = (*args[0])(ass);
for (unsigned int i = 1, size = args.size(); i < size; ++i) {
sum += (*args[i])(ass);
}
return sum;
}
};
template<typename T>
struct Subtraction: public Operator<T> {
T operator() (const std::vector< Expression<T>* >& args, const VariableAssignment<T>& ass) const {
T sum = (*args[0])(ass);
for (unsigned int i = 1, size = args.size(); i < size; ++i) {
sum -= (*args[i])(ass);
}
return sum;
}
};
#include "VariableAssignment.hpp"
#include "Expression.hpp"
#endif
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