CDynamicString

#include <stdio.h>
#include <conio.h>
#include <memory.h>

#define DYNAMIC_STR_START_MEMORY_SIZE 4

class CDynamicString
{
public:
    CDynamicString()
    {
        m_uStrLength = 0;
        m_uMemLength = DYNAMIC_STR_START_MEMORY_SIZE;
        m_pString = new char[m_uMemLength];
    };

    CDynamicString(CDynamicString &_SrcDynStr)
    {
        m_uStrLength = _SrcDynStr.m_uStrLength;
        m_uMemLength = _SrcDynStr.m_uMemLength;
        m_pString = new char[m_uMemLength];

        memcpy(m_pString, _SrcDynStr.m_pString, m_uStrLength);
    };

    CDynamicString(CDynamicString &&_SrcDynStr)
    {
        if (this != &_SrcDynStr)
        {
            m_pString = _SrcDynStr.m_pString;
            m_uStrLength = _SrcDynStr.m_uStrLength;
            m_uMemLength = _SrcDynStr.m_uMemLength;

            memset(&_SrcDynStr, 0, sizeof(CDynamicString));
        }
    };

    CDynamicString(char const *const _pSrcStr)
    {
        m_uMemLength = DYNAMIC_STR_START_MEMORY_SIZE;

        unsigned int nSrcStrLength = 0;
        char const *pSrcStr = _pSrcStr;
        while (*pSrcStr)
        {
            nSrcStrLength++;
            pSrcStr++;
        }

        nSrcStrLength++;

        if (nSrcStrLength > m_uMemLength)
        {
            while (nSrcStrLength > m_uMemLength)
                m_uMemLength <<= 1;
        }

        m_uStrLength = nSrcStrLength;

        m_pString = new char[m_uMemLength];

        memcpy(m_pString, _pSrcStr, m_uStrLength);
    };

    ~CDynamicString()
    {
        if (m_pString)
            delete[] m_pString;
    };

    const CDynamicString &operator=(const CDynamicString &_SrcDynStr)
    {
        if (this != &_SrcDynStr)
        {
            if (_SrcDynStr.m_uStrLength > m_uMemLength)
            {
                while (_SrcDynStr.m_uStrLength > m_uMemLength)
                    m_uMemLength <<= 1;

                delete[] m_pString;

                m_pString = new char[m_uMemLength];
            }

            m_uStrLength = _SrcDynStr.m_uStrLength;

            memcpy(m_pString, _SrcDynStr.m_pString, m_uStrLength);
        }

        return *this;
    };

    const CDynamicString& operator=(CDynamicString &&_SrcDynStr)
    {
        if (this != &_SrcDynStr)
        {
            m_pString = _SrcDynStr.m_pString;
            m_uStrLength = _SrcDynStr.m_uStrLength;
            m_uMemLength = _SrcDynStr.m_uMemLength;

            memset(&_SrcDynStr, 0, sizeof(CDynamicString));
        }

        return *this;
    };

    friend const CDynamicString operator+(const CDynamicString &_SrcDynStr1, const CDynamicString &_SrcDynStr2)
    {
        CDynamicString tmp;
        tmp.m_uStrLength = _SrcDynStr1.m_uStrLength + _SrcDynStr2.m_uStrLength - 1;

        if (tmp.m_uStrLength > tmp.m_uMemLength)
        {
            while (tmp.m_uStrLength > tmp.m_uMemLength)
                tmp.m_uMemLength <<= 1;

            delete[] tmp.m_pString;

            tmp.m_pString = new char[tmp.m_uMemLength];
        }

        memcpy(tmp.m_pString, _SrcDynStr1.m_pString, _SrcDynStr1.m_uStrLength - 1);
        memcpy(tmp.m_pString + _SrcDynStr1.m_uStrLength - 1, _SrcDynStr2.m_pString, _SrcDynStr2.m_uStrLength);

        return tmp;
    }

    char const *const GetString() const
    {
        return m_pString;
    };

    unsigned int const GetLength() const
    {
        return m_uStrLength;
    };
private:
    char *m_pString;
    unsigned int m_uStrLength;
    unsigned int m_uMemLength;
};

int main()
{
    CDynamicString str("myshgfhgfhdgfhdfhdfghgdfhgdfhgdfhgfhgdfhgdfhdftr");
    CDynamicString str2("pri1010hgfhgdfhgdfhdfgd101010hgfdhgdfhgfhdfhfhdfgvet");
    str = str + str2;

    printf("%s %d\n", str.GetString(), str.GetLength());

    _getch();
    return 0;
}