Method do_always_noconv

test/path_unit_test.cpp:1019–1019

protected:
    virtual bool do_always_noconv() const throw() { return false; }
    virtual int do_encoding() const throw() { return 0; }

    virtual std::codecvt_base::result do_in(std::mbstate_t&, const char*, const char*, const char*&, wchar_t*, wchar_t*, wchar_t*&) const