March 01, 2003
C++ Expression TemplatesListing 3: Source code for template-based solution
class Literal {
public:
Literal(const double v) : _val(v) {}
double eval() const { return _val; }
private:
const double _val;
};
class Variable {
public:
Variable(double& v) : _val(v) {}
double eval() const { return _val; }
private:
double& _val;
};
template <class ExprT1,class ExprT2, class BinOp>
class BinaryExpr {
public:
BinaryExpr(ExprT1 e1, ExprT2 e2,BinOp op=BinOp())
: _expr1(e1),_expr2(e2),_op(op) {}
double eval() const
{ return _op(_expr1.eval(),_expr2.eval()); }
private:
ExprT1 _expr1;
ExprT2 _expr2;
BinOp _op;
};
...
— End of Listing —
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