Constructors as Type Conversions

float p_real, p_imaginary;

public:

complex() { p_real = 0.0; p_imaginary = 0.0; }

complex(float r) { p_real = r; p_imaginary = 0.0; }

complex(float r, float i) { p_real = r, p_imaginary = i; }

complex(circuit &c); // a new type of constructor!

};

complex c1; // initialized to 0

complex c2(4.0); // initialized to 4.0 + 0.0i

complex c3(4.0, 5.0); // initialized to 4.0 + 5.0i

complex c4 = 4.0; // new syntax, but identical to c2

// looks like a type conversion!

circuit x; // recall that the voltage of a circuit is

// represented as a complex number

complex c5 = x; // this is a user-defined type conversion:

// complex::complex(circuit &c) is called

// to “convert” type circuit to type complex

// note, unlike previous example, only public

// data can be used from x