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(Query) Base and Derived class constructors
Joined: 24 Jan 2005
Posts: 3
(Query) Base and Derived class constructors
Dear friends,
I have a piece of program like this.
//Main.cpp
//Macro with arguments
#define CONNECT(Port, Wire, name) Port(*this, Wire,
name)
CONNECT(I1, ci1, "And2 I1");
CONNECT(I2, ci2, "And2 I2");
CONNECT(O1, co1, "And2 O1");
//I1,I2 are objects of input class
//O1 is object of output class.
//ci1,ci2,co1 are objects of connector class
//Connector is an abstract base class
//port.h
class Port : public Connector
{
protected:
Port(Connector &, const char* = "Port");
// Only derived ports can be created.
};
class Input : public Port
{
public:
Input(Component &, Connector &, const char* =
"Input");
//This will use the two argument port constructor in
the definition
};
class Output : public Port
{
public:
Output(Component &, Connector &, const char * =
"Output");
//This will use the two argument port constructor in
the definition
};
Actually it`s a very big program.But due to space
restriction I have reduced the program .Hope it`s
clear to you. My doubt is I have a CONNECT ( )
function in my program. So that it would invoke the
port constructor (?Hope I am correct). But the port
constructor is having only 2 arguments. But the
derived classes Input and Output have two constructors
Input( ) and Output( ) with the same three arguments.
Whether the CONNECT ( ) function is invoking the
derived class constructors? If it is true how? What
is the purpose of using macro here?
Thanks in advance..
With Regards
RPrasad
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