Re: [boost] First lambda

From: John Torjo (john.lists_at_[hidden])
Date: 2004-03-08 05:48:23

Aleksey Gurtovoy wrote:

>David Abrahams wrote:
>  
>
>>I just tried using the lambda library for the first time.  Here's
>>what came out of it, after some struggle:
>>
>>  #include <boost/lambda/lambda.hpp>
>>  #include <vector>
>>  #include <numeric>
>>
>>  using namespace boost::lambda;
>>
>>  struct X
>>  {
>>      X() : count(1) {}
>>
>>      unsigned long count;
>>  };
>>
>>  std::vector<X> xs(10);
>>  unsigned long n = std::accumulate(
>>      xs.begin(), xs.end(), 0UL,
>>      _1 + (&_2) ->* &X::count);
>>    
>>
>
>
>Views make it much cleaner, both conceptually and syntactically:
>
>    unsigned long n = accumulate( 
>          transform_view( xs, mem_fn(&X::count) )
>        , 0UL
>        );
>        
>  
>

Indeed ;)
Using views/ranges makes the code much simpler/clearer.

In time, I've accepted the fact that there's not much point in using 
in-place functions (like _1 + _2, etc.), since in real-life they just 
complicate the code.
So I just create a new function (in anonymous namespace), and that's it.

And I use boost::bind, which rocks big time :D

My $0.02

Best,
John