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From: cohler@batcomputer.UUCP
Newsgroups: net.lang.c++
Subject: Arrays of Classes
Message-ID: <566@batcomputer.TN.CORNELL.EDU>
Date: Mon, 7-Jul-86 16:42:55 EDT
Article-I.D.: batcompu.566
Posted: Mon Jul  7 16:42:55 1986
Date-Received: Thu, 10-Jul-86 01:06:38 EDT
Organization: Theory Center, Cornell U., Ithaca NY
Lines: 43
Keywords: arrays, classes, complex


     Machine : c++ on vax/750 running BSD 4.2

     a Bug ?

        We have encountered a problem with allocating storage for
    arrays of classes. Looking at the generated c code it seems
    that 'new' forgets to cast '_vec_new()'. Has anyone else
    had similar problems ?

        The following code illustrates the problem - which 
    goes away by compiling with -DBUGFIX.

        Also complex.h does not have a default constructor -
    so arrays of complex numbers cant be defined at all - this
    of course can be fixed by providing a default constructor
    in complex.h. 


    Gene Cohler                 cohler@lnsvax.tn.cornell.EDU 
    Newman Lab, Cornell Univ    jbvy@cornella.BITNET
    Ithaca NY 14853-5001        {decvax,ihnp4,cmcl2,vax135}
                                !cornell!lnsvax!cohler
    
======================= source code ======================
// tst.c -> Arrays of classes ?
class test
    {
    public:
        int i1;
        int i2;
        test(){i1 = 0; i2 = 0;}
    };

main()
    {
    test *t1    ;
#ifdef BUGFIX
        t1 = (struct test *) new test[10]   ;
#else
        t1 = new test[10]   ;
#endif BUGFIX
    }