"8-17" C + + Learning Note 01

The console program does not automatically exit the method:

• System ("pause");
• GetChar ()
• Use execution Ctrl+f5 to start debugging F5 will appear flash back

Dynamic memory allocation

1 //construct C String2 //class Stringbad::stringbad (char *)3Stringbad::stringbad (Char*Pchar)4 {5str =New Char[Std::strlen (Pchar) +1];6 std:strcpy (str, p);7num_string++;8 }9 //Static class Numer should defined out of the class define fileTen //static int num_string; One intStringbad::num_string =0

// destructor stringbad::~Stringbad () {    num_string--;     Delete [] str;

Copy constructor

• If a class is useful for a pointer member that is initialized by new, you should write a display copy constructor to implement a deep copy to prevent memory leaks.
• The default constructor for a class implements a shallow copy, so you should also write a copy constructor when you have a static member, and the constructor handles static members.
• A copy constructor, which is typically a constant reference to a class, to save memory and time

The C + + compiler provides a class for:

• Default constructor, if no constructor is displayed
• Default destructor
• Default copy function
• Default Assignment function
• Default address operator

"8-17" C + + Learning Note 01