MESSAGE
| DATE | 2016-11-21 |
| FROM | ruben safir
|
| SUBJECT | Subject: [Learn] Fwd: when is the constructor called for an object
|
From learn-bounces-at-nylxs.com Mon Nov 21 03:37:24 2016
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Subject: [Learn] Fwd: when is the constructor called for an object
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constructor confusion
The real problem here is that then new Strousrup text seems to say that
use of {} can be used in lew of "= new" nominclature, but it doesn't
seem to work like he suggests, which means I'm not understanding what he
wrote, or what he wrote wasn't clear ;)
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From: Popping mad
Newsgroups: alt.comp.lang.learn.c-c++
Subject: when is the constructor called for an object
Date: Mon, 21 Nov 2016 02:24:54 +0000 (UTC)
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Xref: panix alt.comp.lang.learn.c-c++:246544
I have a class
class{
public:
Node(Node *){};
Node(){};
Node* left()
{
return _left;
}
left(Node *in)
{
_left=in;
}
private:
Node * _left;
Node * _right;
and in another class I call
Node * tmp;
and later I want to allocate its memory (without using new)
I use
tmp = nullptr;
I can't seem to use
tmp{nullptr};
and when I try
tmp(nullptr){};
if says tmp is not a function
when is the constructor called?
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From: Ike Naar
Newsgroups: alt.comp.lang.learn.c-c++
Subject: Re: when is the constructor called for an object
Date: Mon, 21 Nov 2016 08:31:22 -0000 (UTC)
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Xref: panix alt.comp.lang.learn.c-c++:246549
On 2016-11-21, Popping mad wrote:
> I have a class
> class{
You probably meant
class Node {
> public:
> Node(Node *){};
> Node(){};
> Node* left()
> {
> return _left;
> }
> left(Node *in)
You probably meant
void left(Node *in)
> {
> _left=in;
> }
>
> private:
> Node * _left;
> Node * _right;
};
> and in another class I call
>
> Node * tmp;
>
> and later I want to allocate its memory (without using new)
Why can't you use new?
> I use
>
> tmp = nullptr;
>
> I can't seem to use
> tmp{nullptr};
>
> and when I try
> tmp(nullptr){};
>
> if says tmp is not a function
>
> when is the constructor called?
The constructur is called when an instance of class Node is created.
E.g. like this:
Node *px = new Node; /* constructor Node() is called */
Node *py = new Node(px); /* constructor Node(Node*) is called */
Node z; /* constructor Node() is called */
Node *pz = &z;
Node w(z); /* constructor Node(Node*) is called */
Node *pw = &w;
Node *
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