expression.h

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#ifndef EXPRESSION_H
#define EXPRESSION_H
 
#include <QMap>
#include <QString>
#include <functional>
 
namespace peg
{
template <typename Annotation> struct AstBase;
struct EmptyType;
typedef AstBase<EmptyType> Ast;
} // namespace peg
 
class Expression
{
public:
    double value;
 
    explicit Expression(double initial = 0);
    double parse(const QString &expr);
 
private:
    double eval(const peg::Ast &ast);
    QMap<QString, std::function<double(double)>> fns;
};
 
#endif