[Dev-C++] Demystifying namespace

I have a little bit of a problem with 'namespace'. Here is my problem:
namespace foo{
     #define file __func__
     #define line __LINE__
     enum error_t {one, two, three};
}
namespace foo{
    class loo{
       public:
          loo(){
             std::string f = foo::file;
             size_t l = foo::line;
             std::cout << "file: " << f << " line: " << l << std::endl;
             std::cout << foo::one << foo::two << foo::three << std::endl;
          }
    };
}
These std::cout's give me a parse error, what am I doing wrong?
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