Re: [Boost-users] lambda usage

From: Arkadiy Vertleyb (vertleyb_at_[hidden])
Date: 2007-03-14 17:15:59

"Peng Yu" <pengyu.ut_at_[hidden]> wrote

> I'm made up the following example. But it's not working. Could you
> please show me how to make it work?

> #include <boost/lambda/lambda.hpp>
> #include <boost/lambda/core.hpp>
> #include <iostream>
>
> using namespace boost::lambda;
>
> int main() {
>  std::cout << (_1 + _2)(10, 10) << std::endl;
> }

The function object -- the result of _1 + _2 -- requires T&, and therefore 
you can't pass constants to it.  The following will work:

int n1 = 10;
int n2 = 10;
cout << (_1 + _2)(n1, n2) << endl;

HTH,
Arkadiy