Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!lll-tis!ames!nrl-cmf!mailrus!umix!umich!mibte!gamma!ulysses!allegra!alice!bs
From: bs@alice.UUCP
Newsgroups: comp.lang.c++
Subject: Re: debuggers
Message-ID: <7712@alice.UUCP>
Date: 23 Feb 88 19:20:38 GMT
References: <275@goofy.megatest.UUCP> <7711@alice.UUCP>
Organization: AT&T Bell Laboratories, Murray Hill NJ
Lines: 24
Keywords: debugger
Summary: another example



Class member names are given prefixes by cfront to make them unique
in a generated struct declaration not to please ancient C compilers
that do not understand non-unique member names in different structs.

An example of the use of class member prefixes for data members:

class A { short a; char aa; public: ... };
class B : public A { char a; public: ... };

Here a B has two members called `a' the C code generated must use
two different names for them. For example:

struct B {
	short A_a;
	char A_aa;
	char B_a;
};

An alternative code generation strategy would generate a member of B
of type `struct A' and avoid the prefixes, but on most machines this
would cause the size of B to increase because of alignment requirements.

I chose to make the 'a's private simply to give a plausible example.