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// Soln8_04.cpp
// The only change required is to the assignment operator to check for lhs being the same as rhs
// To trace constructor and operator function calls, uncommenting the next line
#define TRACE
#include <iostream> // For stream input/output
#include <cstring>
using std::cout;
using std::endl;
class CSimpleString
{
private:
size_t len{};
char* buff{};
public:
CSimpleString(const char* p = nullptr);
CSimpleString(const CSimpleString& s);
CSimpleString(CSimpleString&& s); // Move copy constructor
CSimpleString(char c, int count = 1);
CSimpleString(int i);
~CSimpleString();
CSimpleString& operator=(const CSimpleString& rhs); // Assignment operator
CSimpleString& operator=(CSimpleString&& rhs); // Move assignment operator
void print();
};
// Contructor - repeated given character
CSimpleString::CSimpleString(char c, int count)
{
#ifdef TRACE
cout << "Construction from repeated character\n";
#endif
len = count;
if (len)
{
buff = new char[len + 1];
memset(buff, c, len);
buff[len] = '\0';
}
}
// Constructor - from an integer
CSimpleString::CSimpleString(int i)
{
#ifdef TRACE
cout << "Contruction from an integer.\n";
#endif
char sTmp[20];
_itoa_s(i, sTmp, _countof(sTmp), 10);
len = strlen(sTmp);
if (len)
{
buff = new char[len + 1];
strcpy_s(buff, len + 1, sTmp);
}
}
// Constructor
CSimpleString::CSimpleString(const char* p)
{
#ifdef TRACE
cout << "Contruction from a string.\n";
#endif
if (p)
{
len = strlen(p);
if (len)
{
buff = new char[len + 1];
strcpy_s(buff, len + 1, p);
}
}
}
// Copy constructor
CSimpleString::CSimpleString(const CSimpleString& s)
{
#ifdef TRACE
cout << "Copy constructor.\n";
#endif
len = s.len + 1;
buff = new char[len];
strcpy_s(buff, len, s.buff);
}
// Move copy constructor
CSimpleString::CSimpleString(CSimpleString&& s)
{
#ifdef TRACE
cout << "Move copy constructor.\n";
#endif
len = s.len;
buff = s.buff;
s.buff = nullptr; // Prevent the string from being deleted
}
// Destructor
CSimpleString::~CSimpleString()
{
#ifdef TRACE
cout << "Destructor.\n";
#endif
delete[] buff;
}
// Assignment operator - does deal with str = str
CSimpleString& CSimpleString::operator=(const CSimpleString& rhs)
{
#ifdef TRACE
cout << "Assignment operator.\n";
#endif
if (this != &rhs)
{
len = rhs.len + 1;
delete buff;
buff = new char[len];
strcpy_s(buff, len, rhs.buff);
}
return *this;
}
// Move assignment operator
CSimpleString& CSimpleString::operator=(CSimpleString&& rhs)
{
#ifdef TRACE
cout << "Move assignment operator.\n";
#endif
len = rhs.len;
buff = rhs.buff;
rhs.buff = nullptr;
return *this;
}
void CSimpleString::print()
{
cout << buff;
}
int main()
{
CSimpleString marker{ '*', 30 };
/* CSimpleString s1{ "hello" };
CSimpleString s2;
// Test assignment
marker.print();
cout << endl;
cout << "s1 is \"";
s1.print();
cout << "\" and s2 is empty.\n";
s2 = s1;
cout << " After s2 = s1, s2 is \"";
s2.print();
cout << endl;
marker.print();
cout << endl;
// Test construction from an integer
int n = 7890;
CSimpleString nStr{ n };
cout << n << " as a string is \"";
nStr.print();
cout << "\"" << endl;
marker.print();
cout << endl;
*/
// Test move constructor
cout << "Move construction:\n";
CSimpleString s3{ CSimpleString{ "goodbye" } };
s3.print();
cout << endl;
marker.print();
cout << endl;
// Test move assignment
cout << "Move assignment:\n";
s3 = CSimpleString{ "toodlepip" };
s3.print();
cout << endl;
marker.print();
cout << endl;
}
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