widestring.h

#include <string>
#include <wchar.h>

#define MAX_WSTRING2_SIZE 4096

class widestring : public std::wstring
{
public:
    widestring();
    widestring(const wchar_t *__s);
    widestring(const char *__s);
    const char *mb_str() const;     // multibyte string in local encoding

    size_t from_utf8(const char *in);
    const char *to_utf8() const;

private:
    static char s_buffer[MAX_WSTRING2_SIZE];
};