Re: [Boost-users] boost::lambda::bind question
I came across this problem in the real project where I don't control the
class that corresponds to class Y of the example, so I can't change the
signature of the member function. I could write a wrapper function that
takes Y*, but after some point the code with a simple 'for' loop becomes
cleaner and more readable than the one using lambda.
If this problem is not a bug, but an inherent limitation of the lambda
library or its current implementation, it would be nice if it is
mentioned in the documentation.
Thanks,
Eugene Vishnevetsky
Roman Krylov wrote:
Perhaps the only solution here is to use Y* instead of Y& with
corresponding modifications; this way there is no need for var() or smth
similar. Why not?
Vishnevetsky, Eugene (IT) wrote:
>Is it possible to use boost::ref() or boost::lambda::var() of
an
>abstract class as a parameter to boost::lambda::bind()?
>It seems that compiler attempts to instantiate an object of
that
>abstract class.
>Example:
>
>-----------------
>using namespace boost;
>using namespace boost::lambda;
>class Y
>{
>public:
> virtual void foo() = 0;
> void foo2 (){ }
>};
>class Z : public Y
>{
>public:
> void foo(){}
>};
>
>class TT
>{
>public:
> void test( Y& y ) { y.foo2(); }
>};
>
>int main()
>{
> std::vector<TT> xt;
> Z z;
> Y &y = z;
> std::for_each (xt.begin(), xt.end(), bind(&TT::test,_1,
>ref(y)));
> return 0;
>}
>----------------------
>
>And Error message from g++ (GCC) 3.2.3:
>
>---------------------------------
>/boost/tuple/detail/tuple_basic.hpp: In instantiation of
>`boost::tuples::cons
NOTICE: If received in error, please destroy and notify sender. Sender does not waive confidentiality or privilege, and use is prohibited.
On Jul 5, 2005, at 9:06 PM, Vishnevetsky, Eugene ((IT)) wrote:
It's a bug, but requires quite a bit of changes to fix. LL/Phx fusion will (it will happen eventually :) resolve it. Best, Jaakko
-- Jaakko Järvi, jarvi@cs.tamu.edu
Jaakko Järvi wrote:
Definitely! Daniel Wallin has done the last remaining part of the algorithms. Dan Marsden is working on porting LL exceptions. I think we'll see it happen sooner rather than later. Regards, -- Joel de Guzman http://www.boost-consulting.com http://spirit.sf.net
Peter Dimov wrote:
That's an affirmative :-) I just tested it a while ago to be sure. The test passes. Regards, -- Joel de Guzman http://www.boost-consulting.com http://spirit.sf.net
Joel de Guzman wrote:
Ooops. I misunderstood your question. I thought you asked if the test as posted by the OP passes; and sure it does. I havent tried running the boost::bind tests yet. Will do.... Regards, -- Joel de Guzman http://www.boost-consulting.com http://spirit.sf.net
participants (4)
-
Jaakko Järvi -
Joel de Guzman -
Peter Dimov -
Vishnevetsky, Eugene (IT)