AnsiOrWideString_t()

AnsiOrWideString.cpp

//--------------------------------------------------------------------------
#pragma warning(push)
#pragma warning(disable: 4127)
template <class DT, class ST> class AnsiOrWideString_t
{
    const DT *dstr;
    bool bOwned;

    AnsiOrWideString_t &operator =(const AnsiOrWideString_t &) { }
    AnsiOrWideString_t(const AnsiOrWideString_t &) { }
public:
    AnsiOrWideString_t(const DT *str) : dstr(str), bOwned(false)
    {
    }

    AnsiOrWideString_t(const ST *astr) : bOwned(true)
    {
        dstr = NULL;
        int count;

        if (sizeof(ST) == 1)
        {
            count = MultiByteToWideChar(
                CP_UTF8,
                0,
                (LPCCH)astr,
                -1,
                NULL,
                0);
        }
        else
        {
            count = WideCharToMultiByte(
                CP_UTF8,
                0,
                (LPCWCH)astr,
                -1,
                NULL,
                0,
                NULL,
                NULL);
        }

        if (count == 0)
            return;

        DT *w = new DT[count + 1];
        int r;
        if (sizeof(ST) == 1)
        {
            r = MultiByteToWideChar(
                CP_UTF8,
                0,
                (LPCCH)astr,
                -1,
                (LPWSTR)w,
                count);
        }
        else
        {
            r = WideCharToMultiByte(
                CP_UTF8,
                0,
                (LPCWCH)astr,
                -1,
                (LPSTR)w,
                count,
                NULL,
                NULL);
        }

        if (r == 0)
        {
            delete[] w;
            return;
        }

        w[count] = L'\0';

        dstr = w;
    }

    ~AnsiOrWideString_t()
    {
        if (bOwned)
            delete[] dstr;
    }

    inline const DT *c_str()
    {
        return dstr;
    }
};
#pragma warning(pop)
typedef AnsiOrWideString_t<wchar_t, char> WideString_t;
typedef AnsiOrWideString_t<char, wchar_t> AnsiString_t;