How do I get a handle to split_winmain

Question

I am trying to get a get the boost library program_options working on a simple windows console library. I have linked in the library C:\Program Files\boost\boost_1_40\lib\libboost_program_options-vc90-s-1_40.lib Included the header files

#include <boost/program_options.hpp>
#include <boost/program_options/config.hpp>
#include <boost/program_options/option.hpp>
#include <boost/program_options/detail/cmdline.hpp>
#include <boost/program_options/detail/parsers.hpp >

Defined _WIN32 (But I don't think it is required.)

And I still keep getting the

Error   1 error C3861: 'split_winmain': identifier not found

It should be so simple but I can't get it to work. Can anyone tell me what I need to do here. Joseph Shanahan

Answer 1

That function is declared in the boost::program_options namespace. If all you do is use its name alone, the compiler doesn't know what you're talking about. You have a few options:

• Use the fully qualified name when you call it:

  boost::program_options::split_winmain(...);
  

• Tell the compiler which function you mean:

  using boost::program_options::split_winmain;
  split_winmain(...);
  

• Bring the entire namespace into the current scope:

  using namespace boost::program_options;
  split_winmain(...);
  

• Make a namespace alias:

  namespace po = boost::program_options;
  po::split_winmain(...);
  

I prefer the last one.

Do not define the _WIN32 macro; the compiler will do that for you when it's appropriate.

Answer 2

Thanks that answers that question. I should have got onto it myself. However now I have another related problem. It get program_options running do I need to link in 'libboost_program_options-vc90-mt-gd-1_40.lib I have got parts of the boost library working and I just included in the header file. Does program_options work differently. I keep getting a link error now. I am using VS2008

Error 1 fatal error LNK1104: cannot open file 'libboost_program_options-vc90-mt-gd-1_40.lib'