mcs/class/corlib/System/Single.cs

   1 //
   2 // System.Single.cs
   3 //
   4 // Author:
   5 //   Miguel de Icaza (miguel@ximian.com)
   6 //
   7 // (C) Ximian, Inc.  http://www.ximian.com
   8 //
   9
  10 using System.Globalization;
  11
  12 namespace System {
  13
  14         public struct Single : IComparable, IFormattable { //, IConvertible {
  15                 public const float Epsilon = 1.4e-45f;
  16                 public const float MaxValue =  3.40282346638528859e38f;
  17                 public const float MinValue = -3.40282346638528859e38f;
  18                 public const float NaN = 0.0f / 0.0f;
  19                 public const float PositiveInfinity =  1.0f / 0.0f;
  20                 public const float NegativeInfinity = -1.0f / 0.0f;
  21
  22                 // VES needs to know about value.  public is workaround
  23                 // so source will compile
  24                 public float value;
  25
  26                 public int CompareTo (object v)
  27                 {
  28                         if (v == null)
  29                                 return 1;
  30
  31                         if (!(v is System.Single))
  32                                 throw new ArgumentException (Locale.GetText ("Value is not a System.Single"));
  33
  34                         return (int) (value - ((float) v));
  35                 }
  36
  37                 public override bool Equals (object o)
  38                 {
  39                         if (!(o is System.Single))
  40                                 return false;
  41
  42                         return ((float) o) == value;
  43                 }
  44
  45                 public override int GetHashCode ()
  46                 {
  47                         return (int) value;
  48                 }
  49
  50                 public static bool IsInfinity (float f)
  51                 {
  52                         return (f == PositiveInfinity || f == NegativeInfinity);
  53                 }
  54
  55                 public static bool IsNaN (float f)
  56                 {
  57                         return (f != f);
  58                 }
  59
  60                 public static bool IsNegativeInfinity (float f)
  61                 {
  62                         return (f < 0.0f && (f == NegativeInfinity || f == PositiveInfinity));
  63                 }
  64
  65                 public static bool IsPositiveInfinity (float f)
  66                 {
  67                         return (f > 0.0f && (f == NegativeInfinity || f == PositiveInfinity));
  68                 }
  69
  70                 public static float Parse (string s)
  71                 {
  72                         return Parse (s, (NumberStyles.Float | NumberStyles.AllowThousands), null);
  73                 }
  74
  75                 public static float Parse (string s, IFormatProvider fp)
  76                 {
  77                         return Parse (s, (NumberStyles.Float | NumberStyles.AllowThousands), fp);
  78                 }
  79
  80                 public static float Parse (string s, NumberStyles style)
  81                 {
  82                         return Parse (s, style, null);
  83                 }
  84
  85                 [MonoTODO]
  86                 public static float Parse (string s, NumberStyles style, IFormatProvider fp)
  87                 {
  88                         // TODO: Implement me
  89                         throw new NotImplementedException ();
  90                 }
  91
  92                 public override string ToString ()
  93                 {
  94                         return ToString(null, null);
  95                 }
  96
  97                 public string ToString (IFormatProvider fp)
  98                 {
  99                         return ToString(null, fp);
 100                 }
 101
 102                 public string ToString (string format)
 103                 {
 104                         return ToString(format, null);
 105                 }
 106
 107                 [MonoTODO]
 108                 public string ToString (string format, IFormatProvider fp)
 109                 {
 110                         // TODO: Implement me.
 111                         throw new NotImplementedException ();
 112                 }
 113
 114                 // ============= IConvertible Methods ============ //
 115
 116                 public TypeCode GetTypeCode ()
 117                 {
 118                         return TypeCode.Single;
 119                 }
 120         }
 121 }