Re: Alloc Struct

From:

=?ISO-8859-1?Q?Erik_Wikstr=F6m?= <Erik-wikstrom@telia.com>

Newsgroups:

comp.lang.c++

Date:

Sun, 08 Jul 2007 20:54:07 GMT

Message-ID:

<P9cki.3735$ZA.1684@newsb.telia.net>

On 2007-07-08 22:31, Brian C wrote:

Hello all,
    I was going through various online C++ tutorials trying to possibly
pick up some things I do not know about already.
    One had a question on it, along the lines of:

Q. Which of the following lines allocates a struct:

1. int *p=new int;
2. *p=1;
3. int *q=new int(2);
4. Range r=new Range(2,4);

    I didn't finish this tutorial/quiz as I found some of the wording on
other questions a bit vague so I didn't get the answers.
    I assume it is choice 4, but I never heard creating a new instance
"allocating a struct".
    BTW, I know it looks like homework, but believe me, it isn't. I haven't
had homework to do in years.

It's quite bad language, first memory is allocated for the struct
(assuming Range is a struct), then the struct is created (instantiated)
on that memory address. In C++, unlike C, you don't generally just
allocate memory, usually you also create one or more objects in it.

--
Erik Wikstr?m