Re: [Boost-users] Using lambda to count elements in list of lists

From: Peter Dimov (pdimov_at_[hidden])
Date: 2006-02-01 08:30:37

Thorsten Ottosen wrote:
> Daniel Lidström wrote:

>> int main()
>> {
>>    int count = 0;
>>    list<list<int> > ll;
>>    for_each(ll.begin(), ll.end(), var(count)+=(_1).size());
>> }
>>
>> This will not compile: (13): error C2039: 'size': is not a member of
>> 'boost::lambda::lambda_functor<T>'
>> Is this possible to do?
>
> AFAICT, no. Not unless the type of _1 implements all possible member
> functions in the world :-)

    for_each( ll.begin(), ll.end(), count += bind( &list<int>::size, _1 ) );

works for me.