[Boost-users] [Spirit] puts namespace std into the global scope

3 Jul 2006

      It seems that the header boost/spirit.hpp puts
the entire namespace std into the global scope.
That is not very nice!

--- Example 1 --------

#include <string>
#include <sstream>
#include <fstream>
#include <vector>
#include <boost/spirit.hpp>

void f()
{
     string s;
     istringstream iss;
     ofstream ofs;
     vector<int> v;
}

----------------------

Example 1 should not compile (undefined symbols), but does compile.
If the line #include <boost/spirit.hpp> is removed,
then Example 1 does not compile.

--- Example 2 --------

#include <boost/filesystem/path.hpp>
#include <boost/filesystem/fstream.hpp>

#include <boost/spirit.hpp>

using boost::filesystem::path;
using boost::filesystem::ifstream;

void g()
{
     path p;
     ifstream ifs(p);
}

----------------------

Example 2 should compile but does not.
The compiler complains that the symbol ifstream is ambigous.
If the line #include <boost/spirit.hpp> is removed,
then Example 2 does compile.

I´m using Boost 1.33.1 and MSVC 7.1 on a Windows XP computer.

--Johan Råde

rade@maths.lth.se