problem with multiple inheritance

[Tony Johansson]

Hello experts!

I have a small program that is using multiple inheritance.
There are 4 classes involved
I get 4 compile error that I can't figure out why.
It's this row which is located in the main program see below that is causing
these compile errors.
cout << p->getName() << endl;
Here is the first compile error the other might be a consequesce of the
first one.
c:\Documents and Settings\Tony\kau\cplusplus\test4\start.cpp(13): error
C2446: '<' : no conversion from 'std::vector<_Ty>::size_type (__thiscall
std::vector<_Ty>::* )(void) const' to 'int'
with
[
_Ty=Person *
]

Here are all the class definitions
*********************
#include <string>
using namespace std;
class Person
{
public:
Person(string nn = "default") : name(nn) {}
string getName() const
{
return name;
}
private:
string name;
};

class Student : public virtual Person
{
public:
Student(string nn="default") : Person(nn) {}
};

class Employee : public virtual Person
{
public:
Employee(string nn="default") : Person(nn) {}
};

class TeachingAssistent : public Student, public Employee
{
public:
TeachingAssistent(string nn="default") : Person(nn) {}
};

Here is main program
****************
#include <vector>
#include "person.h"
#include <iostream>
using namespace std;

int main()
{
vector<Person *> p;
p.push_back(new Student);
p.push_back(new Employee);
p.push_back(new TeachingAssistent);

for(int i=0; i < p.size; i++)
cout << p->getName() << endl;

return 0;
}

Many thanks

//Tony

 

[Victor Bazarov]

[...]
for(int i=0; i < p.size; i++)

If you intend to find the size of the vector, you need to _call_ the
function 'size'. For that you need to supply the parentheses:

... i < p.size() ...

cout << p->getName() << endl;

return 0;
}

V

 

[Serge Paccalin]

Le mardi 16 août 2005 à 21:16:49, Tony Johansson a écrit dans
comp.lang.c++ :

Hello experts!

I have a small program that is using multiple inheritance.
There are 4 classes involved
I get 4 compile error that I can't figure out why.
It's this row which is located in the main program see below that is causing
these compile errors.
cout << p->getName() << endl;

Actually, no, it's *this* line:

for(int i=0; i < p.size; i++)

Here is the first compile error the other might be a consequesce of the
first one.
c:\Documents and Settings\Tony\kau\cplusplus\test4\start.cpp(13): error
C2446: '<' : no conversion from 'std::vector<_Ty>::size_type (__thiscall
std::vector<_Ty>::* )(void) const' to 'int'
with
[
_Ty=Person *
]

You have a problem with the comparison: (error C2446: '<') because
you're comparing an int (i) with a function pointer (p.size). 'size' is
not a piece of data, but a function; you want this:

for (int i=0; i < p.size(); i++)

for(int i=0; i < p.size; i++)
cout << p->getName() << endl;

--
___________ 16/08/2005 21:29:42
_/ _ \_`_`_`_) Serge PACCALIN -- sp ad mailclub.net
\ \_L_) Il faut donc que les hommes commencent
-'(__) par n'être pas fanatiques pour mériter
_/___(_) la tolérance. -- Voltaire, 1763

 

[Ruwen Schnabel]

Hi,

your problem is not related to multiple inheritance at all. The problem is
that you forgot the brackets behind the function call p.size() in the for
loop.

Greetings,
Ruwen