mcs/class/corlib/System/Nullable.cs

   1 //
   2 // System.Nullable
   3 //
   4 // Martin Baulig (martin@ximian.com)
   5 //
   6 // (C) 2004 Novell, Inc.
   7 //
   8
   9 using System.Reflection;
  10 #if GENERICS
  11 using System.Collections.Generic;
  12 #endif
  13 using System.Runtime.CompilerServices;
  14
  15 #if GENERICS
  16 namespace System
  17 {
  18         [CLSCompliant(false)]
  19         public struct Nullable<T>
  20         {
  21                 T value;
  22                 bool has_value;
  23
  24                 public Nullable (T value)
  25                 {
  26                         this.value = value;
  27                         this.has_value = true;
  28                 }
  29
  30                 public bool HasValue {
  31                         get { return has_value; }
  32                 }
  33
  34                 public T Value {
  35                         get { return value; }
  36                 }
  37
  38                 public T GetValueOrDefault ()
  39                 {
  40                         if (has_value)
  41                                 return value;
  42                         return default (T);
  43                 }
  44
  45                 public T GetValueOrDefault (T def_value)
  46                 {
  47                         if (has_value)
  48                                 return value;
  49                         else
  50                                 return def_value;
  51                 }
  52         }
  53 }
  54 #endif