Question

我有一个Complex类，带有定义的+，-，*，/的Friend Complex运算符。

class Complex
{
private:
        float Re;
        float Im;

public:
        friend Complex operator + (const Complex ,const Complex );
        friend Complex operator * (const Complex ,const Complex );
        friend Complex operator - (const Complex ,const Complex );
        friend Complex operator / (const Complex ,const Complex );
};

Complex operator + (const Complex a,const Complex b)
{

    Complex c(0,0);
    c.Re=a.Re+b.Re;
    c.Im=a.Im+b.Im;
    return c;
}

Complex operator * (const Complex a,const Complex b)
{
    Complex c(0,0);
    c.Re=a.Re*b.Re;
    c.Im=a.Im*b.Im;
    return c;
}

Complex operator - (const Complex a,const Complex b)
{
    Complex c(0,0);
    c.Re=a.Re-b.Re;
    c.Im=a.Im-b.Im;
    return c;
}


Complex operator / (const Complex a,const Complex b)
{
    if(b.Im && b.Re)
    {
        Complex c(0,0);
        c.Re=a.Re/b.Re;
        c.Im=a.Im/b.Im;
        return c;
    }
    else
    {
        std::cout<<"Cannot divide, one of parametars is zero."<<std::endl;
    }
}

我想优化的是，而不是多次编写所有代码，而只需更改+，-，*，/运算符，就可以编写一次，而在int main（）中某些操作符被称为（使用），只是读取它并将其应用于函数。有可能吗？

Answer 1

您可以执行以下操作：

将此模板函数添加到Complex中：

template <typename OP>
static Complex apply(const Complex a, const Complex b, OP op) {
    Complex c;
    c.Re = op(a.Re, b.Re);
    c.Im = op(a.Im, b.Im);
    return c;
}

然后，运算符的实现要小一些：

Complex operator + (const Complex a,const Complex b)
{
    return Complex::apply(a, b, std::plus<float>());
}

Complex operator * (const Complex a,const Complex b)
{
    return Complex::apply(a, b, std::multiplies<float>());
}

Complex operator - (const Complex a,const Complex b)
{
    return Complex::apply(a, b, std::minus<float>());
}

Complex operator / (const Complex a,const Complex b)
{
    if(b.Im && b.Re)
    {
    return Complex::apply(a, b, std::divides<float>());
    }
    else
    {
        std::cout<<"Cannot divide, one of parametars is zero."<<std::endl;
        // Note: missing return value here
    }
}

注意：对于复数，乘法和除法的定义不是这样。

注2：我不认为这会小很多，因为据我所知，您必须一个一个地定义运算符（立即定义它们并不容易，至少在C ++ 17中不是这样））。

我如何优化这部分代码：

1 个答案: