Problem with push_back,help me ASAP

[AnuSree]

hi



am getting error when am trying to type cast.is it possible to type
cast from one type of vector to another type.is there any other way
other than overloading.my peice of code in which am getting error is.



Here is my peice of code.

_______________ ______



vector<Varbind> varbinds;

vector<NameValu ePair> nameValuePairs;



if(varbinds.siz e()!=0) {



for(int index = 0;index<varbind s.size();++inde x) {



nameValuePairs. push_back(varbi nds[index]);

}



}



here i have to cast the type of varbinds from type vector<Varbinds > to
the type vector<NameValu ePair>





And the second query is

_______________ _______



it is also with push_back.Here is the peice of code



vector<NameValu ePair> ar = req.arr();

VarbindList varbinds;

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

varbinds.push_b ack(ar); //Error Here

}



Here varbinds is the object of the class VarbindList and ar is of
type vector<NameValu ePair>.I have to cast vector<NameValu ePairs> to the
type VarbindList.



Please help me in this to aspects ASAP.


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[Victor Bazarov]

Re: Problem with push_back,help me ASAP

"AnuSree" <member44430@db forums.com> wrote...[color=blue]
> am getting error when am trying to type cast.is it possible to type
> cast from one type of vector to another type.is there any other way
> other than overloading.my peice of code in which am getting error is.
>
>
>
> Here is my peice of code.
>
> _______________ ______
>
>
>
> vector<Varbind> varbinds;
>
> vector<NameValu ePair> nameValuePairs;
>
>
>
> if(varbinds.siz e()!=0) {
>
>
>
> for(int index = 0;index<varbind s.size();++inde x) {
>
>
>
> nameValuePairs. push_back(varbi nds[index]);[/color]

It is only possible to do this if 'Varbind&' is convertible to
'NameValuePair const&'.
[color=blue]
>
> }
>
>
>
> }
>
>
>
> here i have to cast the type of varbinds from type vector<Varbinds > to
> the type vector<NameValu ePair>[/color]

No, you only have to have 'Varbinds' convertible to 'NameValuePair' but
since you didn't post the definition of either of them, there is no way
to recommed anything in particular.
[color=blue]
> And the second query is
>
> _______________ _______
>
>
>
> it is also with push_back.Here is the peice of code
>
>
>
> vector<NameValu ePair> ar = req.arr();
>
> VarbindList varbinds;[/color]

What's 'VarbindList'? I'll assume that it's a vector<Varbind> .
Next time please specify.
[color=blue]
>
> for ( int i = 0; i < ar.size(); ++i ) {
>
> varbinds.push_b ack(ar); //Error Here[/color]

Well, again, you're trying to use 'vector<NameVal uePair>' where
a 'Varbind' is expected (under my assumption).
[color=blue]
>
> }
>
>
>
> Here varbinds is the object of the class VarbindList and ar is of
> type vector<NameValu ePair>.I have to cast vector<NameValu ePairs> to the
> type VarbindList.[/color]

No, you don't have to cast to 'VarbindList', you only need it to be
convertible to the type '.push_back()' expects.

Next time post the _complete_ code. And take it easy with whitespace,
will you?

Victor

[AnuSree]

Re: Problem with push_back,help me ASAP


Hi Victor



Thanks for your trail, here am sending you the VarbindList class
definition.



_______________

Class VarbindList:

_______________



#ifndef VARBINDLIST_H

#define VARBINDLIST_H



#include "Varbind.h"

#include "Vector.h"

#include <vector.h>

#include "Snmp.h"

#include "Object.h"



class VarbindList : public Vector {



public:

VarbindList() {



static const string INVALID_OBJ =
"Invalid instance";

static const string INVALID_OBJ_VEC = "Not
an instance of vector";

}

VarbindList(int initialCapacity );



static VarbindList decodeSequence( Asn1Value
aVarbinds);// throws



void addVarbind(Obje ct aVarbind);// throw Exception;





void addVarbinds(vec tor <Object> aVarbindArray);// throw
Exception;





void addVarbinds(Vec tor aVectorOfVarbin ds);// throw Exception;





void addVarbinds(Obj ect aVarbind);// throw Exception;





vector <Varbind> getVarbindArray ();

vector <Object> encode();

char * toString();



// Constants

private:

static const string INVALID_OBJ;// = "Invalid
instance";

static const string INVALID_OBJ_VEC ;// = "Not an
instance of vector";

};

#endif // VARBINDLIST_H



_______________ ____

Class NameValuePair:

_______________ ____



# ifndef NAMEVALUEPAIR_H

# define NAMEVALUEPAIR_H



#include "Snmp.h"

# include "AllInclude s.h"



class NameValuePair {

private:

string Name;

string Value;



public:

NameValuePair() { }

NameValuePair(s tring mName, string mValue) {

Name = mName;

Value = mValue;

}

//Get methods..

string name() { return Name; }

string value() { return Value; }



//Set Methods

void name(string mName) { Name = mName; }

void value(string mValue) { Value = mValue; }

};

# endif





And this is the peice of code of a method in which i am getting error
when am using push_back.



Message SnmpSouthAdapto r :: encode(Request req) {



vector<NameValu ePair> ar = req.arr();

VarbindList varbinds;// = VarbindList();

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

varbinds.push_b ack(ar); //Error Here

}

}





Here in varbinds.push_b ack(ar); i have to type cast the type of ar
from vector<NameValu ePair> to the type VarbindList but am not getting
hoe to do this,since the type of the ar is not the same as the type
of varbind am getting error no matching function for call to

`VarbindList::p ush_back (NameValuePair &)'





Here VarbindList is a class and varbinds is the object of the class
VarbindList and ar is of type vector<NameValu ePair>.



I wrote the class header files of both VarbindList and NameValuePair on
the top.Help ASAP


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