basic_string with unsigned short

Discussion in 'C++' started by wolverine, Oct 30, 2006.

  1. wolverine

    wolverine Guest

    Hi,
    Given below is a traits with unsigned short. If i create a
    stringstream with this traits will there be any problem.

    struct XMLCh_traits
    {
    typedef unsigned short char_type;

    typedef unsigned int int_type;

    typedef streampos pos_type;
    typedef streamoff off_type;
    typedef mbstate_t state_type;

    static void assign(char_type& __c1, const char_type& __c2)
    { __c1 = __c2; }

    static bool eq(const char_type& __c1, const char_type& __c2)
    { return __c1 == __c2; }

    static bool lt(const char_type& __c1, const char_type& __c2)
    { return __c1 < __c2; }

    static int compare(const char_type* __s1, const char_type*
    __s2, size_t __n)
    {
    for (size_t __i = 0; __i < __n; ++__i)
    if (!eq(__s1[__i], __s2[__i]))
    return lt(__s1[__i], __s2[__i]) ? -1
    :1;
    return 0;
    }

    static size_t length(const char_type* __s)
    {
    const char_type* __p = __s;
    while (*__p) ++__p;
    return (__p - __s);
    }

    static const char_type* find(const char_type* __s, size_t __n,
    const char_type& __a)
    {
    for (const char_type* __p = __s; size_t(__p - __s) <
    __n; ++__p)
    if (*__p == __a) return __p;
    return 0;
    }

    static char_type* move(char_type* __s1, const char_type* __s2,
    size_t __n)
    { return (char_type*) memmove(__s1, __s2, __n *
    sizeof(char_type)); }

    static char_type* copy(char_type* __s1, const char_type* __s2,
    size_t __n)
    { return (char_type*) memcpy(__s1, __s2, __n *
    sizeof(char_type)); }

    static char_type* assign(char_type* __s, size_t __n, char_type
    __a)
    {
    for (char_type* __p = __s; __p < __s + __n; ++__p)
    assign(*__p, __a);
    return __s;
    }

    static char_type to_char_type(const int_type& __c)
    { return char_type(__c); }

    static int_type to_int_type(const char_type& __c)
    { return int_type(__c); }

    static bool eq_int_type(const int_type& __c1, const int_type&
    __c2)
    { return __c1 == __c2; }

    static int_type eof() { return static_cast<int_type>(-1); }

    static int_type not_eof(const int_type& __c)
    { return eq_int_type(__c, eof()) ? int_type(0) : __c; }

    };

    //typedef unsigned short XMLCh;
    typedef std::basic_string<unsigned short, XMLCh_traits> uString;
    typedef std::basic_stringstream<unsigned short, XMLCh_traits>
    uStringStream;

    unsigned short result;
    //this _U is macro which uses XMLString::transcode
    //to get a XMLCh* out of char*
    uString str(_U("123"));
    uStringStream stream(str);
    stream>>result; // debugger showes this line causes aborting
    cout<<result<<endl;

    The program is getting ABORTED. Could any one tell me why ?

    Thanks in Advance
    Kiran Pradeep.
    wolverine, Oct 30, 2006
    #1
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