rstl_string.cpp

template <typename _CharTp>
class basic_string
{
    struct COWData
    {
        uint32_t x0_capacity;
        uint32_t x4_refCount;
        _CharTp x8_data[];
    };

    const _CharTp* x0_ptr;
    COWData* x4_cow;
    uint32_t x8_size;

    void internal_allocate(int size)
    {
        x4_cow = reinterpret_cast<COWData*>(new uint8_t[size * sizeof(_CharTp) + 8]);
        x0_ptr = x4_cow->x8_data;
        x4_cow->x0_capacity = uint32_t(size);
        x4_cow->x4_refCount = 1;
    }

    static const _CharTp _EmptyString;

public:
    struct literal_t {};

    basic_string(literal_t, const _CharTp* data)
    {
        x0_ptr = data;
        x4_cow = nullptr;

        const _CharTp* it = data;
        while (*it)
            ++it;

        x8_size = uint32_t((it - data) / sizeof(_CharTp));
    }

    basic_string(const basic_string& str)
    {
        x0_ptr = str.x0_ptr;
        x4_cow = str.x4_cow;
        x8_size = str.x8_size;
        if (x4_cow)
            ++x4_cow->x4_refCount;
    }

    basic_string(const _CharTp* data, int size)
    {
        if (size <= 0 && !data)
        {
            x0_ptr = &_EmptyString;
            x4_cow = nullptr;
            x8_size = 0;
            return;
        }

        const _CharTp* it = data;
        uint32_t len = 0;
        while (*it)
        {
            if (size != -1 && len >= size)
                break;
            ++it;
            ++len;
        }

        internal_allocate(len + 1);
        x8_size = len;
        for (int i = 0; i < len; ++i)
            x4_cow->x8_data[i] = data[i];
        x4_cow->x8_data[len] = 0;
    }

    ~basic_string()
    {
        if (x4_cow && --x4_cow->x4_refCount == 0)
            delete[] x4_cow;
    }
};

template <>
const char basic_string<char>::_EmptyString = 0;
template <>
const wchar_t basic_string<wchar_t>::_EmptyString = 0;

typedef basic_string<wchar_t> wstring;
typedef basic_string<char> string;

wstring wstring_l(const wchar_t* data)
{
    return wstring(wstring::literal_t(), data);
}

string string_l(const char* data)
{
    return string(string::literal_t(), data);
}