Path: utzoo!utgpu!watserv1!watmath!att!rutgers!usc!jarthur!uunet!microsoft!jimad
From: jimad@microsoft.UUCP (Jim ADCOCK)
Newsgroups: comp.lang.c++
Subject: Re: constructor called within constructor???
Message-ID: <55850@microsoft.UUCP>
Date: 16 Jul 90 18:57:44 GMT
References: <965@unet.UUCP> <11017@alice.UUCP> <174@logo.procase.UUCP>
Reply-To: jimad@microsoft.UUCP (Jim ADCOCK)
Organization: Microsoft Corp., Redmond WA
Lines: 34

In article <174@logo.procase.UUCP> roger@procase.UUCP (Roger H. Scott) writes:
>Andrew Koenig's "helper" functions [build()] don't solve the problem of
>factoring out common *initialization*.  For example,
....

Again, an alternative approach to constructor helper methods is to introduce 
an intermediate helper class.  C++ is designed such that introducing a helper 
class need not lead to an unreasonable cost.

    class Base {
    public:
	Base(int, double, char *, char *);
    };

    class String {
    public:
	String(char *);
    };

    class HelpDerive : public Base {
    public:
	HelpDerive() : Base(2,4.6,"foo","bar"), Mem1("aack"), Mem2("pfft") { }
    private:
	String Mem1, Mem2;
    };

    class Derived : public HelpDerive {
    public:
	Derived() : myI(0), myJ(0) { }	    // [this example could be handled 
	Derived(int i) : myI(i), myJ(0) { } // better via default args ....
	Derived(int i, int j) : myI(i), myJ(j) { } // .... ]
    private:
	int myI, myJ;
    };