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Path: utzoo!mnetor!uunet!munnari!otc!mikem
From: mikem@otc.OZ (Mike Mowbray)
Newsgroups: comp.lang.c++
Subject: Re: complex arrays
Message-ID: <157@otc.OZ>
Date: Tue, 4-Aug-87 19:40:21 EDT
Article-I.D.: otc.157
Posted: Tue Aug  4 19:40:21 1987
Date-Received: Fri, 7-Aug-87 06:44:12 EDT
References: <3400003@uicsgva>
Organization: O.T.C. Systems Development, Australia
Lines: 51

In article <3400003@uicsgva>, rahmeh@uicsgva.UUCP says:
>                   
> 	The following program:
> 
> 		#include	<complex.h>
> 		main()
> 		{
> 			complex a[2];
> 		}
> 
> 	causes the C++ compiler to produce the following error
> 	message:
> 
> 		line 5: sorry, not implemented: default arguments
> 		for constructor for vector of class complex

The problem is that cfront doesn't yet have a good way to pass arbitrary
arguments into a function that initialises arrays of user-defined objects.
The fix involves creating a complex constructor that takes no arguments.
Alter <complex.h> so that there are two constructors instead of one. The
standard version looks like:

    class complex {
	    double  re, im;
	public:
	    complex(double r = 0.0, double i = 0.0)	{ re = r; im = i; }

	    // .....
    };

Change it to:

    class complex {
	    double  re, im;
	public:
	    complex()					{ re = im = 0.0; }
	    complex(double r, double i = 0.0)		{ re = r; im = i; }

	    // .....
    };

The above program then compiles happily.

			Mike Mowbray
		    Systems Development
			|||| OTC ||

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