Calling C++ static member functions from C code

Question

I have a bunch of C code. I have no intention to convert them into C++ code.

Now, I would like to call some C++ code (I don't mind to modify the C++ code so that they are callable by C code).

class Utils {
public:
    static void fun();
}

class Utils2 {
public:
    static std::wstring fun();
}

If I tend to call them with the following syntax, they wont compiled (I am using VC++ 2008, with C code files with .c extension)

Utils::fun();
// Opps. How I can access std::wstring in C?
Utils2::fun();

Any suggestion?

Answer 1

// c_header.h
#if defined(__cplusplus)
extern "C" {
#endif

void Utils_func();
size_t Utils2_func(wchar_t* data, size_t size);

#if defined(__cplusplus)
}
#endif
//eof

// c_impl.cpp
// Beware, brain-compiled code ahead!
void Utils_func()
{
  Utils::func();
}

size_t Utils2_func(wchar_t* data, size_t size)
{
  std::wstring wstr = Utsls2::func();
  if( wstr.size() >= size ) return wstr.size();
  std::copy( wstr.begin(), wstr.end(), data );
  data[wstr.size()] = 0;
  return str.size();
}
//eof