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From: Ioannis Vranos <ivr@remove.this.grad.com>
Newsgroups: comp.lang.ada,comp.lang.c++,comp.realtime,comp.software-eng
Subject: Re: [OT] Re: Teaching new tricks to an old dog (C++ -->Ada)
Date: Mon, 28 Mar 2005 18:12:48 +0300
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Date: 2005-03-28T18:12:48+03:00
List-Id: <comp.lang.ada>

Dave Thompson wrote:

> Where available, alloca does allocate on the stack. AFAICS this can
> do, at a lower/less-safe level, everything Ada can do at function
> scope. It can't do allocation _and deallocation_ for a block within a
> function, nor cross-function like function-return-unconstrained. It
> almost has to be special-cased/inlined so it should be efficient.


In C++ you can always do:

#include <new>


class SomeClass
{
};


void somefunc()
{
     unsigned char obj[sizeof(SomeClass)];

     SomeClass *p= new(obj)SomeClass;

     delete p;
}


as also:


#include <new>


class SomeClass
{
};


SomeClass *somefunc()
{
     static unsigned char obj[sizeof(SomeClass)];

     return new(obj)SomeClass;
}


int main()
{
     SomeClass *p= somefunc();

     delete p;
}


Here the object is created in the stack.


-- 
Ioannis Vranos

http://www23.brinkster.com/noicys

[I am using 90 characters word-wrapping - (800/640) *72= 90 or better described as: 
(800/640) *80 - 10 for quotation= 90. If someone finds it inconvenient, please let me know].