Re: Call constructor in another

From:
Kai-Uwe Bux <jkherciueh@gmx.net>
Newsgroups:
comp.lang.c++
Date:
Sat, 28 Apr 2007 22:22:15 -0400
Message-ID:
<f10vgn$sfr$1@murdoch.acc.Virginia.EDU>
Blair Craft wrote:

hi,

I got a class have 2 constructors:

static int g_idx_counter = 0;

[code]
Object::Object():{
   counter = g_idx_counter++;
   created_at = last_used = time(NULL);
   destroyed = false;
   id = -1;
}

Object::Object(int _id){
    Object();


The line Object() creates a temporary object of type Object and initializes
it using the constructor Object::Object(). It does not call the constructor
Object::Object() for the object currently being initialized by
Object::Object(int).

    id = _id;
}
[/code]

when I use:

  Object *o = new Object();

everything is OK, but when using the second constructor:

  Object *o = new Object(32);

member variable "counter" will remain untouched, I did a gdb trace,
Object::Object() was invoked and inside that function "counter" was
initialized, when function returns "counter" went back to 0
again. Behavior is like a local variable inside a code chunk, but here
counter is a class member variable, anyone can shed some light?


Constructors do not work like ordinary member functions. That's why they
are "special".

Best

Kai-Uwe Bux

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