Re: [Boost-users] Simply including boost/bind.hpp causes compilation error

From: Ken Smith (kgsmith_at_[hidden])
Date: 2008-05-12 13:34:26

On Sat, May 10, 2008 at 9:12 AM, Steven Watanabe <watanabesj_at_[hidden]> wrote:
>  Ken Smith wrote:
>  > Here is the code.
>  >
>  >   1 #include <boost/lambda/lambda.hpp>
>  >   2 #include <boost/lambda/construct.hpp>
>  >   3 #if defined(INCLUDE_BOOST_BIND)
>  >   4 #   include <boost/bind.hpp>
>  >   5 #endif
>  >   6 #include <iostream>
>  >   7 #include <iterator>
>  >   8 #include <algorithm>
>  >  30
>  >  31 int main()
>  >  32 {
>  >  33     using namespace std;
>  >  34     using namespace boost::lambda;
>  >  35
>  >  36     typedef std::istream_iterator<int> in;
>  >  37     std::for_each(in(std::cin), in(), std::cout << (_1 * 3) << " " );
>  >  76 }
>  >
>  > Any ideas?
>  >
>
>  Boost.Bind declares the placeholders _1, _2, etc at global scope.
>  Boost.Lambda declares the placeholders _1, _2, and _3 in namespace
>  boost::lambda.
>  The use of _1 in this context is ambiguous.  Try qualifying it.
>  namespace bll = boost::lambda;
>
>  (bll::_1 * 3)

Thanks for this idea.  I was also able to solve this problem by changing

using namespace boost::lambda;

to

using boost::lambda::_1;

   Ken