Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!microsoft!jimad
From: jimad@microsoft.UUCP (Jim ADCOCK)
Newsgroups: comp.lang.c++
Subject: Re: `new'ing an object that has a constructor
Message-ID: <55908@microsoft.UUCP>
Date: 18 Jul 90 15:12:19 GMT
References: <5137@castle.ed.ac.uk> <1990Jul13.115822.17803@sco.COM>
Reply-To: jimad@microsoft.UUCP (Jim ADCOCK)
Organization: Microsoft Corp., Redmond WA
Lines: 48

In article <5137@castle.ed.ac.uk> ecsv38@castle.ed.ac.uk (S Manoharan) writes:
>Well, the subject line says it all. How do I `new' an object
>that's got a constructor? I am interested in `new'ing an array
>of such objects.

Here's an example of a work-around for arrays.  Use a static member function
to provide a default for initializing objects.  This could be generalized
to providing a default function for initializing object ....

extern "C"
{
#include "stdio.h"
}

class VAL
{
	int i;
	static int valdefault;
public:
	static void SetDefault(int d) { valdefault = d; }
	VAL() : i(valdefault) { }
	VAL(int ii) : i(ii) { }
	void SetVal(int ii) { i = ii; }
	int GetVal() { return i; }
	void Print() { printf("%d\n",i); }
};
int VAL::valdefault = 0;

main()
{
	int i;

	VAL::SetDefault(234);
	VAL* AVAL = new VAL[5];

	for (i=0; i<5; ++i)
		AVAL[i].Print();
	putchar('\n');

	VAL::SetDefault(432);
	VAL* AVAL2 = new VAL[5];

	for (i=0; i<5; ++i)
		AVAL2[i].Print();
	putchar('\n');

	return 0;
}