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encapsulation issue
Hello everyone, I have got some questions and i am really hopping someone could help me out with them. I have a class privately encapsulated in another class. Now, I'm trying to make an object of it in my testDriver but I'm not quite sure how to do that. I've tried a bunch of things but it resulted in failure.
#include <vcl.h>
#pragma hdrstop
#include<iostream>
#include"Flights.h"
using namespace std;
//---------------------------------------------------------------------------
#pragma argsused
int main(int argc, char* argv[]){
string Adl, Mel;
// FlightsTL::Flight::FlightsTL:Flight::Flight b ;
cout<<"check if this works and then we are in business\n";
system("pause");
return 0;
}
I've written out all the code declarations in my header file and I've implemented it in the following CPP file (I'm going to put the code down). This is what my code looks like:
#include"Flights.h"
//Start House-keeping functions
/*Default constructor
*
*/
FlightsTL:: Flight:: Flight (){
setOrigin("");
setDestination("");
setDepartureTime(0);
setDuration(0) ;
}
/* Constructor for flight object
*
*
*/
FlightsTL:: Flight::Flight(const string &orig ,const string &destin ,const double &dep, const double &dur ){
org = orig;
dest = destin;
depTime =dep;
dura = dur;
}
/* copy constructor for flight object
*
*
*
FlightsTL:: Flight:: Flight(const Flight& rhs){
} */
/**destructor for flight object
*
*
*/
FlightsTL:: Flight:: ~Flight(){
}
//end House-keeping functions
//______________________________________________\\
/* Equals operation
*
*/
FlightsTL::Flight& FlightsTL:: Flight::operator=(const Flight& rhs){
return *this;
}
/* get origin
*
*/
string FlightsTL:: Flight::getOrigin() const{
return org;
}
/* get destination
*
*/
string FlightsTL:: Flight::getDestination()const{
return dest;
}
/* get departure time
*
*/
double FlightsTL:: Flight:: getDepartureTime()const{
return depTime;
}
/* get duration
*
*/
double FlightsTL:: Flight:: getDuration ()const{
return dura;
}
/* set origin
*
*/
void FlightsTL:: Flight:: setOrigin(string t ){
org = t;
}
/* set destination
*
*/
void FlightsTL:: Flight:: setDestination(string s){
dest =s;
}
/* set departure time
*
*/
void FlightsTL:: Flight:: setDepartureTime(double c){
depTime = c;
}
/* get duration
*
*/
void FlightsTL:: Flight:: setDuration(double d){
dura = d;
}
/* set all
*
*/
void FlightsTL:: Flight:: setAll(string a,string b,double c,double d){
setOrigin(a);
setDestination(b);
setDepartureTime(c);
setDuration(d) ;
}
/** ToString to display flight information
*
*/
string FlightsTL:: Flight:: toString()const{
string s;
double depT = getDepartureTime();
double durA = getDuration();
// convert double to string
char deptStr[50];
sprintf(deptStr,"%g",depT);
// convert to string
char durStr[50];
sprintf(durStr,"%g",durA);
// print all Flight information
s=getOrigin() +"\t"+ getDestination() + "\t"+ deptStr + "\t"+ durStr +"\n" ;
return s;
}
//__________________end of Flight implementation_____________\\
/*Default constructor
*
*/
FlightsTL::FlightsTL(){
FlightsNum = 0;
}
/* constructor
*
*
*/
// FlightsTL:: FlightsTL(int num){
// }
/*copy constructor
*
*
*/
FlightsTL:: FlightsTL (const FlightsTL& rhs){
Flights = rhs.Flights;
}
/*destructor
*
*
*/
FlightsTL:: ~FlightsTL(){
}
/*Equals operator
*
*
*/
FlightsTL& FlightsTL::operator=(const FlightsTL& rhs){
if (this != &rhs){
return *this;
}
return *this;
}
/* get FlightsNum
*
*/
int FlightsTL:: getFlightsNum (int num){
return FlightsNum;
}
/* set FlightsNum
*
*/
//void FlightsTL:: setFlightsNum(int num){
// }
/*add Flighr
*
*/
void FlightsTL:: addFlight(const string& origin , const string& destination,const double& depTime, const double& duration){
Flights.push_back(Flight(origin,destination,depTime,duration));
FlightsNum++;
}
/** ToString to display all flights and thier information
*
*/
string FlightsTL:: toString()const{
return 0;
}
I'd like to know how to instantiate the privately encapsulated class and the class that's encapsulating it in my testDriver. And if you notice anything else in the code which is bad please let me know.Thank you for help in advance:)
Jay F
Is Your member a type FlightTl and i dont see any Declaration of a Flight type for acessing it.
Secondly , I dont know perfectly on this matter but i think that only a static class member can be a member of the same class .
CODEBLOCKS GIVES THIS A ERROR.
class hello
{
hello hello2;//This is an error According to my Compiler.
int x;
} Sky Diploma
Practically a Posting Shark
865 posts since Mar 2008
Reputation Points: 673
Solved Threads: 131
> I have a class privately encapsulated in another class. You can't access it except in the encapsulating class or friends of the encapsulating class. That's how private access works, and if you need to access the class outside of the encapsulating class or friends, then it shouldn't be private.
then what do you suggest? i m lost.
Nick Evan
Not a Llama
Moderator
10,112 posts since Oct 2006
Reputation Points: 4,142
Solved Threads: 403
Is Your member a type FlightTl and i dont see any Declaration of a Flight type for acessing it.
Secondly , I dont know perfectly on this matter but i think that only a static class member can be a member of the same class .
CODEBLOCKS GIVES THIS A ERROR.
class hello { hello hello2;//This is an error According to my Compiler. int x; }
this was how i was trying to access the Flight class FlightsTL::Flight::FlightsTL:Flight::Flight b ;
if this is not right then should i separate the two classes?
this the Header file:
#ifndef FLIGHTS_
#define FLIGHTS_
#include <iostream>
#include <string>
#include <vector>
#include <sstream>
using namespace std;
class FlightsTL{
private:
class Flight {
private:
string org; //origin of flight
string dest; //destination of flight
double depTime; // departure time
double dura; // duration of flight
public:
//Start House-keeping functions
/*Default constructor
*
*/
Flight ();
/* Constructor for flight object
*
*
*/
Flight(const string&, const string&,const double&,const double&);
/* copy constructor for flight object
*
*
*/
Flight(const Flight& rhs);
/**destructor for flight object
*
*
*/
~Flight();
//end House-keeping functions
//______________________________________________\\
/* Equals operation
*
*/
Flight& operator=(const Flight& rhs);
/* get origin
*
*/
string getOrigin()const;
/* get destination
*
*/
string getDestination()const;
/* get departure time
*
*/
double getDepartureTime()const;
/* get duration
*
*/
double getDuration ()const;
/* set origin
*
*/
void setOrigin(string);
/* set destination
*
*/
void setDestination(string);
/* set departure time
*
*/
void setDepartureTime(double);
/* get duration
*
*/
void setDuration(double);
/* set all
*
*/
void setAll(string,string,double,double);
/** ToString to display flight information
*
*/
string toString()const;
} ; // _________end of Flight class__________________\\
friend class Flight;
private:
int FlightsNum; // keeps track of how many airports there are
vector<Flight> Flights; // container for all flights
public:
/*Default constructor
*
*/
FlightsTL();
/* constructor
*
*
*/
FlightsTL(int);
/*copy constructor
*
*
*/
FlightsTL (const FlightsTL& rhs);
/*destructor
*
*
*/
~FlightsTL();
/*Equals operator
*
*
*/
FlightsTL& operator=(const FlightsTL& rhs);
/* get FlightsNum
*
*/
int getFlightsNum (int);
/* set FlightsNum
*
*/
void setFlightsNum(int);
/*add Flighr
*
*/
void addFlight(const string&, const string&,const double&, const double&);
/** ToString to display flight information
*
*/
string toString()const;
} ;
#endif /*FLIGHTS_*/Hey How About this thing.
Something like
class memclass
{
int y;
//.... All Functions are mentioned here for the Member Class
}
class bigclass
{
int x;
public://You can also keep memclass private and then acess it with a function.
memclass member;//The Member is now accessible using the . operator..
//Functions Continue And so on.
} Sky Diploma
Practically a Posting Shark
865 posts since Mar 2008
Reputation Points: 673
Solved Threads: 131
To access the member you will only need to do this.
int main()
{
bigclass sky;
sky.member::init();//That is if you have written a function like init.
} Sky Diploma
Practically a Posting Shark
865 posts since Mar 2008
Reputation Points: 673
Solved Threads: 131
Hey How About this thing.
Something like
class memclass { int y; //.... All Functions are mentioned here for the Member Class } class bigclass { int x; public://You can also keep memclass private and then acess it with a function. memclass member;//The Member is now accessible using the . operator.. //Functions Continue And so on. }
Thank you for solving my problem, it worked
This question has already been solved
You
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