关于调用私用的问题

[jibee]

Complex Complex::operand+( const Complex &operand2 ) const
{
return Complex( real + operand2.real,
imaginary + operand2.imaginary );
}
Complex 是定义的一个类，real和 imaginary是它的私有成员，Complex （double ,double)是construtor,为什么这类函数Complex（double,double)
可以直接调用operand2的私有成员operand2.real?

[ToperRay]

Class members declared as private can be used only by member functions and friends (classes or functions) of the class.

private 是类相关的，不是对象相关的。

[scq2099yt]

私有成员可以通过公有接口或函数调用