Re: help for cpp code

[Marc Boris Dürner]

On Tuesday 23 December 2003 13:35, Dheerendra Kulkarni wrote: 
> Please help me in what this code means 
> 
> NRLOLSR::NRLOLSR(nsaddr_t id) : Agent(PT_NRLOLSR),htimer(this), 
> ttimer(this) { 
> ... 
> .. 
> .. 
> .. 
> 
> }; 
> 
> This is actually a constructor for a class called NRLOLSR now I don't 
> Understand what does literals following ':' mean (will they call functions

> which are given there or what) 
> Dheerendra Kulkarni 
 
There should really be a CommonC++ channel on IRC  :) Also try #c++ on 
irc.freenode.net for questions like this in the future. 
 
I is called the initialiser-list. The items in that list are initialised
before the constructor is 
called. The initialiser list is used to: 
 
- pass parameters to the constructor of a base class 
- initialise member variables  
 
Take the following example: 
 
// 
// A simple class A with a int as a private member. 
// Here the initialiser list is used to set the private member 
// to what is passed in to the consructor 
// 
class A { 
   public: 
   A(int i) : _number(i) {} 
   ~A() {} 
   private: 
   int _number; 
}; 
 
// 
// A simple class B also with a private member. Here 
// the initialiser list is used to call the constructor of the 
// base class A and to set the member _ othernumber to 5 
// 
class B : public A { 
   public: 
   B() : A(3), _othernumber(5) {} 
   ~B() {} 
   private: 
   int _othernumber; 
}; 
 
 
regards, 
Marc 

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