C++Talk.NET

David Goodyear · Guest

Hi all, plz plz help this has been annoying me for way too long now Sad

(Please excuse any wrong terms)

I am trying to wrap various data types into specific object wrappers derived
from a base class.

The idea is to provide a generic print function in the super? class, that
they are all derived from. As they would all use the same formatting params,

I have put some static ints in the super? class. In the end I would derive
more than one class.

I cant use other approaches as the final code, will be something based on
this but with other objects, but currently would suffer from the problems
discovered here :(

In borland builder 5 the constructor for IntegerWrapper compiles with the
error param::Label is not an unambiguous base class of 'IntegerParameter'.

Could someone please explain the general flaw with the following code, and
maybe a solution to it?

Many thanks, for any and all help Smile

- P.S This is not a school, college
etc... project... I have a mini project and am doing this to learn C++ many
thanks.

David

THIS WOULD BE THE HEADER FILE -> "CustomChildren.h"

#ifndef WRAP_TEST
#define WRAP_TEST

// String manipulation lib
#include <string>
// Output Libs
#include <ostream.h>
#include <iomanip.h>

class wrapper
{
public:
...
static void applyOutputFormat(const unsigned int Precision = 6,
const unsigned int _preLabelTabs = 0,
const unsigned int _PreValueTabs = 1,
const unsigned int _PreUnitTabs = 1,
const unsigned int _LabelFieldSpaces = 0,
const unsigned int _ValueFieldSpaces = 0,
const unsigned int _UnitFieldSpaces = 0);
friend ostream& operator<< (ostream& out, const wrapper& w); //
Creates a formatted string
...
protected:
char* Label, Units;
private:
static int PreValueTabs, PreUnitTabs, PreLabelTabs,
LabelFieldSpaces, ValueFieldSpaces, UnitFieldSpaces;
};

#ENDIF

class IntegerWrapper : public wrapper
{
public:
...
IntegerWrapper(const int _IntValue, const char* _Label, const char*
_Units): IntValue(_IntValue), Label(_Label) {}
...
protected:
private:
int IntValue;
};

THIS WOULD BE THE CPP FILE

#include
#include <iomanip.h>
#include "CustomChildren.h"

ostream& operator<< (ostream& out, const wrapper& w) {
int loopCntr;

for (loopCntr = 0; loopCntr < parameter::PreLabelTabs; loopCntr++) out <<
't';
out << setfill(' ') << setw(parameter::LabelFieldSpaces) << w.Label;

for (loopCntr = 0; loopCntr < parameter::PreValueTabs; loopCntr++) out <<
't';
out << setfill(' ') << setw(parameter::ValueFieldSpaces) <<
"VAL!";//Accessor for internal variable will go here.

for (loopCntr = 0; loopCntr < parameter::PreUnitTabs; loopCntr++) out <<
't';
out << setfill(' ') << setw(parameter::UnitFieldSpaces) << w.Units;

return out;
}

int main()
{
return 0;
}

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Thomas Mang · Guest

Jack Klein · Guest

On 27 Jan 2004 05:59:30 -0500, "David Goodyear" <dag6 (AT) kent (DOT) ac.uk>
wrote in comp.lang.c++.moderated:

[snip]

Dylan Nicholson · Guest

Thomas Mang <a9804814 (AT) unet (DOT) univie.ac.at> wrote