Re: [Boost-bugs] [Boost C++ Libraries] #426: lambda vs pure virtual functions

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #426: lambda vs pure virtual functions
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2008-02-13 15:58:40

#426: lambda vs pure virtual functions
-------------------------------+--------------------------------------------
  Reporter:  sw_creator        |       Owner:  no-maintainer
      Type:  Support Requests  |      Status:  new          
 Milestone:                    |   Component:  lambda       
   Version:  None              |    Severity:  Showstopper  
Resolution:  None              |    Keywords:               
-------------------------------+--------------------------------------------
Changes (by marshall):

  * owner:  urzuga => no-maintainer
  * status:  assigned => new
  * component:  None => lambda
  * severity:  => Showstopper

Old description:

> {{{
> Hello all !
> i tried to complile this code:
> -----------------------
> namespace Filter{
>
> class ResultType {...};
> class SubExpression
> {
> public:
>   virtual ResultType Result()=0;
> };
> typedef boost::shared_ptr<SubExpression> SPtrSubExpression;
> ............
> void F()
> {
>    namespace la=boost::lambda;
>    ResultType r;
>    vector<SPtrSubExpression> v;
> ..................................
>    vector<SPtrSubExpression>::const_iterator
> i=find_if(v.begin(), v.end(),
>         la::bind(&SubExpression::Result, *la::_1)==r);
> }
>
> }
> -------------------------
> and I received error:
>
> c:\Program
> Files\boost-1-32-0\boost\tuple\detail\tuple_basic.hpp(419):
> error C2259: 'Filter::SubExpression' : cannot
> instantiate abstract class
>
> complier :VC++ 7.1
> boost 1.32.0
>
> what's wrong?
> thanks.
> }}}

New description:

 {{{
 Hello all !
 i tried to complile this code:
 -----------------------
 namespace Filter{

 class ResultType {...};
 class SubExpression
 {
 public:
   virtual ResultType Result()=0;
 };
 typedef boost::shared_ptr<SubExpression> SPtrSubExpression;
 ............
 void F()
 {
    namespace la=boost::lambda;
    ResultType r;
    vector<SPtrSubExpression> v;
 ..................................
    vector<SPtrSubExpression>::const_iterator
 i=find_if(v.begin(), v.end(),
         la::bind(&SubExpression::Result, *la::_1)==r);
 }

 }
 -------------------------
 and I received error:

 c:\Program
 Files\boost-1-32-0\boost\tuple\detail\tuple_basic.hpp(419):
 error C2259: 'Filter::SubExpression' : cannot
 instantiate abstract class

 complier :VC++ 7.1
 boost 1.32.0

 what's wrong?
 thanks.
 }}}

-- 
Ticket URL: <http://svn.boost.org/trac/boost/ticket/426#comment:1>
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