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