Re: [Boost-users] can't get first example in boost tutorial to work

From: 7stud (bbxx789_05ss_at_[hidden])
Date: 2008-04-20 15:36:58

Jens Seidel <jensseidel <at> users.sf.net> writes:

> 
> On Sun, Apr 20, 2008 at 03:35:27AM +0000, 7stud wrote:
> > Following the instructions in the tutorial, I installed
> > boost in /usr/local as instructed, so my directory 
> > structure is:
> > 
> > /usr/local/boost_1_34_1/boost
> > 
> > I also tried to execute the program from the command line with
> > the original include path:
> > 
> > #include <boost/lambda/lambda.hpp>
> > 
> > but I get the same error:
> > 
> > ~/2testing/dir1$ g++ prog1.cpp
> > prog1.cpp:1:35: error: boost/lambda/lambda.hpp:
> 
> You need of course to specify /usr/local/boost_1_34_1 as include path
> via -isystem /usr/local/boost_1_34_1 or -I /usr/local/boost_1_34_1
> so that the compiler knows where to find boost header files.
> 
> Jens
> 

Here is the tutorial example:

#include <boost/lambda/lambda.hpp>
#include <iostream>
#include <iterator>
#include <algorithm>

int main()
{
  using namespace boost::lambda;
  typedef std::istream_iterator<int> in;
  
  std::for_each(in(std::cin), in(), std::cout << (_1 * 3) << " " );
  return 0;
}

And this is what happens:

gcc -I /usr/local/boost_1_34_1 prog1.cpp

/usr/bin/ld: Undefined symbols:
std::basic_ios<char, std::char_traits<char> >::operator void*() const
std::basic_istream<char, std::char_traits<char> >::operator>>(int&)
std::basic_ostream<char, std::char_traits<char> >::operator<<(int)
std::ios_base::Init::Init()
std::ios_base::Init::~Init()
std::cin
std::cout
std::basic_ostream<char, std::char_traits<char> >
& std::operator<< <std::char_traits<char> >
(std::basic_ostream<char, std::char_traits<char> >&, char const*)
___gxx_personality_v0
collect2: ld returned 1 exit status