11,1 Obyektga mo‘ljallangan yondashuv tarixi

#include < iostream> using namespace std; class Complex {
double re, im; public:
Complex(){};
Complex(double rel, double iml)


{
re = rel; im = iml;
}
void show()
{
cout <<"re="«re«"im = "«im «endl;
};
friend Complex operator + (Complex a, Complex b);

friend Complex operator + (double x, Complex b); friend Complex operator + (Complex a, double y);
};
Complex operator + (Complex a, Complex b)
{
return (Complex(a.re + b.re, a.im + b.im));
};
Complex operator + (double x, Complex b)
{
return (Complex(x + b.re, b.im));
}
Complex operator+(Complex a, double v)
{
return (Complex (a.re+v, a.im));
};
int main ()
{
Complex CC (1.0, 2.0);
Complex EE(3.0,4.0);
Complex DD = CC + EE;
DD.show();
EE⁼EE + 2.0;
EE.show(); return 0;


}
Natija: re=4 im = 6 re=5 im = 4
Standart turlarni sinf obyektiga keltirish vazifasini konstruktorga topshirish mumkin. Masalan, Complex sinfiga quyidagi konstruktorni qo'yish hamma yordamchi funksiyalardan xalos boiish imkonini beradi: Complex (double x)
i
x
real=x; imag=0.0;
}


Bu holda quyidagi prototipga ega bo'lgan dostona operatsiya-funksiya- dan foydalanish yetarli.
friend Complex operator • (Complex, Complex);
Sinfga konstruktor qo'shish o‘rniga yagona konstruktorga ikkinchi parametr qiymatini kiritish yetarli:
Complex (double re, double im =0.0)
{
real=re; imag = im;
}
Ikkinchi imkoniyat sinf komponenta funksiyalardan foydalanishdir. Har qanday biror amal sinfga tegishli statik komponenta operatsiya-funk- siya yordamida qayta yuklanishi mumkin. Bu holda bitta parametrga ega bo'lib, sarlavhasi quyidagi ko'rinishda bo'ladi:
T operator & (T X)
Bu yerda T - sinf, & - operatsiya.
Operatsiya funksiyani oddiy sinf komponenta funksiyasi sifatida cha­qirish mumkin.


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