Can't assign a member which is a pointer to a templatized class

My problem is that in my "Widget" class i've the following declaration:

MouseEvent* X;

In a member function I initialize the pointer with an address the normal way:

X = new MouseEvent;

Ok, this last line makes the compiler stop at:

error C2166: l-value specifies const object

All right, a MouseEvent is declared as a typedef to simplify things:

typedef Event__2<void, Widget&, const MouseEventArgs&> MouseEvent;

And Event__2 is, as you may imagine as: (basic structure shown):

template <typename return_type, typename arg1_T, typename arg2_T>
class Event__2
{
     ...
};

I don't know where the Event__2 class gets the const qualifier. Any tips ?

Thanks.

From stackoverflow

• Likely, the member function where you are initializing X is marked as const - something like this.

  class Foo
  {
     int *Bar;
  
  public:
  
     void AssignAndDoStuff() const
     {
        Bar = new int; // Can't assign to a const object.
        // other code
     }
  }
  

  The solution here is either to

  1. Assign to Bar in a separate non-const method,
  2. change AssignAndDoStuff to be non-const, or
  3. mark Bar as mutable.

  Pick one of the above:

  class Foo
  {
     mutable int *Bar; // 3
  
  public:
     void Assign() // 1
     {
         Bar = new int; 
     }   
     void DoStuff() const
     {
         // Other code
     }
  
     void AssignAndDoStuff() // 2
     {
        Bar = new int; 
        // other code
     }
  }
  

  Greg Hewgill : +1 for psychic debugging.

  Shmoopty : Agreed. Impressive, Josh!

• Likely, the member function where you are initializing X is marked as const.

  AAAARRRGHH!!! That was the problem.... Thank you Josh, this is caused by coding at 4:10 AM, i'm going now to bed :)

  Thank you.

  Eclipse : Glad I can help - I've hit the same problem often enough!