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

20 Apr 2008

      Jens Seidel  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 
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 
#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::operator void*() const
std::basic_istream::operator>>(int&)
std::basic_ostream::operator<<(int)
std::ios_base::Init::Init()
std::ios_base::Init::~Init()
std::cin
std::cout
std::basic_ostream
& std::operator<< 
(std::basic_ostream&, char const*)
___gxx_personality_v0
collect2: ld returned 1 exit status