Accessing a variable from another class

Question

1.00/5 (2 votes)

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Hi all,
There are two classes class1 and class2

C++

class1()
{
public: 
CV3 Value1;
}

class2()
{
//how to access the variable Value1 here?
}

C++

class1* temp;
temp->variable.x; 
//this gives initialisation error;

Posted 18-Jul-12 2:03am

Sumal.V

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4 solutions

Solution 2

A possible variant :) :

C++

class A
{
  int m_iVar;
public:
  A(int iVar) : m_iVar(iVar) {}
  int GetVar() const { return m_iVar; }
};

class B
{
  A* m_pcA;
public:
  B(A* pcA) : m_pcA(pcA) { ASSERT(m_pcA); }
  int Test() const { return m_pcA ? m_pcA->GetVar() : 0; }
}

void Tast()
{
  enum { testVar = 3 };
  A a(testVar);
  B b(&a);
  int iResult(b.Test());
  ASSERT(testVar == iResult);
}

Posted 18-Jul-12 2:18am

Eugen Podsypalnikov

Solution 3

Why doing all? just inherit class A as parent to class B. so you can access class A public variable using class B object

Posted 18-Jul-12 17:42pm

Aburik

Updated 18-Jul-12 17:44pm

v2

Solution 4

Also u can make class2 as a friend class of class1 to access members of it.

Posted 18-Jul-12 19:14pm

joyjhonson

Comments

Albert Holguin 19-Jul-12 10:51am

This is only applicable to accessing private members. You also need to already have the object instantiated somehow.

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C^hris L^osinger · Accepted Answer · 2012-07-18T02:10:00

Solution 1

//this gives initialisation error;

of course it does. you haven't actually created an instance of an object of type class1. you created a pointer to an object, and they you didn't point it to anything.

try this:

class1 temp;
temp.variable.x;

or this:

class1 *temp = new class1;
temp->variable.x;

Posted 18-Jul-12 2:10am

C^hris L^osinger154.1K

Comments

Sumal.V 18-Jul-12 8:36am

Thanks, was being a lil silly :P