D Documentation  
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  1. Introduction
    1. A simple tutorial
    2. Switching to D
    3. An advanced tutorial
  2. Language Reference
    1. General syntax
    2. Statements
    3. Types
      1. void
      2. bit
      3. Integer data types
      4. Floatingpoint data types
      5. Character data types
      6. Derived data types
      7. User Defined Types
        1. Classes
      8. Delegates
    4. Error Handling
    5. Memory Management
  3. Std. runtime library (Phobos)
    1. std.base64
    2. std.boxer
    3. std.compiler
    4. std.conv
    5. std.ctype
    6. std.date
    7. std.file
    8. std.format
    9. std.gc
    10. std.intrinsic
    11. std.math
    12. std.md5
    13. std.mmfile
    14. std.outbuffer
    15. std.path
    16. std.process
    17. std.random
    18. std.recls
    19. std.regexp
    20. std.socket
    21. std.socketstream
    22. std.stdint
    23. std.stdio
    24. std.stream
    25. std.string
    26. std.system
    27. std.thread
    28. std.uri
    29. std.utf
    30. std.zip
    31. std.zlib
  4. Libraries and Tools
    1. mango
    2. Build
  5. Related Links
  6. About this documentation
Classes
A class foo is described with the class statement:

class foo
{
  /* your code here */
}

A class can contain variables and zero or more constructors , which are called when an object of this class is generated:
class foo
{
  int a = 0;
  this()
  {
    a++;
  }
  this(int b)
  {
    a = b;
  }
}

foo myFoo  = new foo();  // myFoo.a  is 1
foo myFoo2 = new foo(5); // myFoo2.a is 5

Every class can have none ore one SuperClass, from which it is inherited from. It's constructor ("this()") can use super to call the SuperClasses constructor:

class bar:foo {
  bool isnumber;
  this() {
    isnumber = false;
    super(-1);
  }
  this(int b) {
    super(b+1);
    isnumber = true;
  }
}

bar myBar  = new bar();  // myBar.a  is -1 , myBar.isnumber == false
bar myBar2 = new bar(8); // myBar2.a is  9 , myBar.isnumber == true

In this case, SuperClass is foo, the class name is bar and the constructor of foo is called with -1 or with b+1.
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