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c++ - virtual d'tor definition not allowed in class

reply Richard <fractal clark.net> writes:
umm..

Guess I'm confused about something here.

I try:

class test {
public:
test() { }
virtual ~test() = 0 { };
};

and get from compiler:

//sc blah.cpp -Ae -mn -C -WA -S -NL -3 -a8 -c -gf -D_MT=1
-D_STLP_NO_NEW_IOSTREAMS=1 -oblah.obj
//Error: D:\APPS\DM\APPLIANCE\blah.h(60): ';' expected following declaration of
struct member

If I remove pure virtual constraint, or move definition out of class, all is
well. Am I missing something about the rules of virtual d'tor definition in
classes?

Richard
Nov 01 2002
next sibling parent reply "Matthew Wilson" <dmd synesis.com.au> writes:
An initial reaction is to question whether it is the trailing semi-colon

"Richard" <fractal clark.net> wrote in message
news:aptlqs$ah7$1 digitaldaemon.com...

 umm..

 Guess I'm confused about something here.

 I try:

 class test {
 public:
 test() { }
 virtual ~test() = 0 { };
 };

 and get from compiler:

 //sc blah.cpp -Ae -mn -C -WA -S -NL -3 -a8 -c -gf -D_MT=1
 -D_STLP_NO_NEW_IOSTREAMS=1 -oblah.obj
 //Error: D:\APPS\DM\APPLIANCE\blah.h(60): ';' expected following




 struct member

 If I remove pure virtual constraint, or move definition out of class, all




 well. Am I missing something about the rules of virtual d'tor definition




 classes?

 Richard
Nov 01 2002
parent Richard <fractal clark.net> writes:
In article <aptm8d$ark$1 digitaldaemon.com>, Matthew Wilson says...

An initial reaction is to question whether it is the trailing semi-colon



Sorry. Adding the ";" was a knee jerk reaction when compiler gave error. I
accidently posted posted that. Compiler responds the same with or without
trailing ";".

Richard
Nov 01 2002
prev sibling parent reply Christof Meerwald <cmeerw web.de> writes:
On Fri, 1 Nov 2002 10:42:36 +0000 (UTC), Richard wrote:

 I try:
 
 class test {
 public:
 test() { }
 virtual ~test() = 0 { };
 };
 




 If I remove pure virtual constraint, or move definition out of class, all is
 well. Am I missing something about the rules of virtual d'tor definition in
 classes?



See 10.4 Abstract classes of the C++ Standard:

(2) ... [Note: a function declaration cannot provide both a pure-specifier
and a definition -end note] [Example:
  struct C {
    virtual void f() { }=0;     // ill-formed
  };
-end example]


bye, Christof

-- 
http://cmeerw.org                                 JID: cmeerw jabber.at
mailto cmeerw at web.de

...and what have you contributed to the Net?
Nov 01 2002
parent reply Richard <fractal clark.net> writes:
In article <aptp10$dfk$1 digitaldaemon.com>, Christof Meerwald says...


See 10.4 Abstract classes of the C++ Standard:



Thanks Christof. Is there an online reference to the C++ standard?

Richard
Nov 01 2002
parent reply Christof Meerwald <cmeerw web.de> writes:
On Fri, 1 Nov 2002 17:56:57 +0000 (UTC), Richard wrote:

See 10.4 Abstract classes of the C++ Standard:






The November 1996 working paper is available from
http://www.dfv.rwth-aachen.de/doc/c++std/ and you can buy the PDF version
from the ANSI Webstore for USD 18
(http://webstore.ansi.org/ansidocstore/product.asp?sku=ISO%2FIEC+14882%2D1998)


bye, Christof

-- 
http://cmeerw.org                                 JID: cmeerw jabber.at
mailto cmeerw at web.de

...and what have you contributed to the Net?
Nov 01 2002
parent Richard <fractal clark.net> writes:
The November 1996 working paper is available from
http://www.dfv.rwth-aachen.de/doc/c++std/ and you can buy the PDF version
from the ANSI Webstore for USD 18
(http://webstore.ansi.org/ansidocstore/product.asp?sku=ISO%2FIEC+14882%2D1998)



WOW. Thanks so very much.

Richard
Nov 02 2002