Can const member variable of class be initialized in a method instead of constructor?
===

I have a class and want to create a const int variable but the value for the variable is not available to me in constructor of the class.

In initialization method of the class i get the value. Can I assign it in that method?
 As I am assigning it only once (as const says) why it isn't working? 


Code is as Following [Just a ProtoType] :


**File : A.h**

    Class A
    {
      private :
      const long int iConstValue;

      public :
      A();
      initClassA();
    }


**File : A.cpp**

    A::A()
    {
     //CanNot initialize iConstValue (Don't have it)
    }

    A::initClassA(some params)
    {
     // calculation according to params for iConstValue
     iConstValue = (some value)
    }
This is not working. Somebody has any Solutions?

**NOTE :** I **Can not get value for iconstValue in constructor** by any way as there are some restriction. So Please don't suggest to do that.

