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#ifndef EQUATION_H
#define EQUATION_H
#include "Variable.h"
#include "Expression.h"
#include <map>
#include <string>
template<class T>
struct Equation {
Equation(const Variable<T>& var, Expression<T>* value)
: _var(var), _value(value) { }
Variable<T> var() const {
return _var;
}
Variable<T> var(const Variable<T>& var) {
Variable<T> old_var = _var;
_var = var;
return _var;
}
Expression<T>* value() const {
return _value;
}
Expression<T>* value(const Expression<T>* value) {
Expression<T>* old_value = _value;
_value = value;
return old_value;
}
std::map<std::string, T> solve(const std::map<std::string, T>& curr) {
std::map<std::string, T> result = curr;
T last;
do {
last = result[_var.name()];
result[_var.name()] = _value->eval(result);
} while (last != result[_var.name()]);
return result;
}
private:
Variable<T> _var;
Expression<T>* _value;
};
#endif
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