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 //
  11 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System.Globalization;
  34
  35 #if NET_2_0
  36 using System.Runtime.ConstrainedExecution;
  37 #endif
  38
  39 namespace System
  40 {
  41         [Serializable]
  42         public struct Single : IComparable, IFormattable, IConvertible
  43 #if NET_2_0
  44                 , IComparable <float>
  45 #endif
  46         {
  47                 public const float Epsilon = 1.4e-45f;
  48                 public const float MaxValue =  3.40282346638528859e38f;
  49                 public const float MinValue = -3.40282346638528859e38f;
  50                 public const float NaN = 0.0f / 0.0f;
  51                 public const float PositiveInfinity =  1.0f / 0.0f;
  52                 public const float NegativeInfinity = -1.0f / 0.0f;
  53
  54                 internal float m_value;
  55
  56                 public int CompareTo (object v)
  57                 {
  58                         if (v == null)
  59                                 return 1;
  60
  61                         if (!(v is System.Single))
  62                                 throw new ArgumentException (Locale.GetText ("Value is not a System.Single."));
  63
  64                         float fv = (float)v;
  65
  66                         if (IsPositiveInfinity (m_value) && IsPositiveInfinity (fv))
  67                                 return 0;
  68
  69                         if (IsNegativeInfinity (m_value) && IsNegativeInfinity (fv))
  70                                 return 0;
  71
  72                         if (IsNaN (fv))
  73                                 if (IsNaN (m_value))
  74                                         return 0;
  75                                 else
  76                                         return 1;
  77
  78                         if (IsNaN (m_value))
  79                                 if (IsNaN (fv))
  80                                         return 0;
  81                                 else
  82                                         return -1;
  83
  84                         if (this.m_value == fv)
  85                                 return 0;
  86                         else if (this.m_value > fv)
  87                                 return 1;
  88                         else
  89                                 return -1;
  90                 }
  91
  92                 public override bool Equals (object o)
  93                 {
  94                         if (!(o is System.Single))
  95                                 return false;
  96
  97                         if (IsNaN ((float) o)) {
  98                                 return IsNaN (m_value);
  99                         }
 100
 101                         return ((float) o) == m_value;
 102                 }
 103
 104 #if NET_2_0
 105                 public int CompareTo (float value)
 106                 {
 107                         if (IsPositiveInfinity (m_value) && IsPositiveInfinity (value))
 108                                 return 0;
 109
 110                         if (IsNegativeInfinity (m_value) && IsNegativeInfinity (value))
 111                                 return 0;
 112
 113                         if (IsNaN (value))
 114                                 if (IsNaN (m_value))
 115                                         return 0;
 116                                 else
 117                                         return 1;
 118
 119                         if (IsNaN (m_value))
 120                                 if (IsNaN (value))
 121                                         return 0;
 122                                 else
 123                                         return -1;
 124
 125                         if (this.m_value == value)
 126                                 return 0;
 127                         else if (this.m_value > value)
 128                                 return 1;
 129                         else
 130                                 return -1;
 131                 }
 132
 133                 public bool Equals (float value)
 134                 {
 135                         if (IsNaN (value))
 136                                 return IsNaN (m_value);
 137
 138                         return value == m_value;
 139                 }
 140 #endif
 141
 142                 public unsafe override int GetHashCode ()
 143                 {
 144                         float f = m_value;
 145                         return *((int*)&f);
 146                 }
 147
 148                 public static bool IsInfinity (float f)
 149                 {
 150                         return (f == PositiveInfinity || f == NegativeInfinity);
 151                 }
 152
 153 #if NET_2_0
 154                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, CER.Success)]
 155 #endif
 156                 public static bool IsNaN (float f)
 157                 {
 158                         return (f != f);
 159                 }
 160
 161                 public static bool IsNegativeInfinity (float f)
 162                 {
 163                         return (f < 0.0f && (f == NegativeInfinity || f == PositiveInfinity));
 164                 }
 165
 166                 public static bool IsPositiveInfinity (float f)
 167                 {
 168                         return (f > 0.0f && (f == NegativeInfinity || f == PositiveInfinity));
 169                 }
 170
 171                 public static float Parse (string s)
 172                 {
 173                         double parsed_value = Double.Parse (
 174                                 s, (NumberStyles.Float | NumberStyles.AllowThousands), null);
 175                         if (parsed_value > (double) float.MaxValue)
 176                                 throw new OverflowException();
 177
 178                         return (float) parsed_value;
 179                 }
 180
 181                 public static float Parse (string s, IFormatProvider provider)
 182                 {
 183                         double parsed_value = Double.Parse (
 184                                 s, (NumberStyles.Float | NumberStyles.AllowThousands), provider);
 185                         if (parsed_value > (double) float.MaxValue)
 186                                 throw new OverflowException();
 187
 188                         return (float) parsed_value;
 189                 }
 190
 191                 public static float Parse (string s, NumberStyles style)
 192                 {
 193                         double parsed_value = Double.Parse (s, style, null);
 194                         if (parsed_value > (double) float.MaxValue)
 195                                 throw new OverflowException();
 196
 197                         return (float) parsed_value;
 198                 }
 199
 200                 public static float Parse (string s, NumberStyles style, IFormatProvider provider)
 201                 {
 202                         double parsed_value = Double.Parse (s, style, provider);
 203                         if (parsed_value > (double) float.MaxValue)
 204                                 throw new OverflowException();
 205
 206                         return (float) parsed_value;
 207                 }
 208
 209                 public override string ToString ()
 210                 {
 211                         return ToString (null, null);
 212                 }
 213
 214                 public string ToString (IFormatProvider provider)
 215                 {
 216                         return ToString (null, provider);
 217                 }
 218
 219                 public string ToString (string format)
 220                 {
 221                         return ToString (format, null);
 222                 }
 223
 224                 public string ToString (string format, IFormatProvider provider)
 225                 {
 226                         NumberFormatInfo nfi = NumberFormatInfo.GetInstance (provider);
 227                         return NumberFormatter.NumberToString (format, m_value, nfi);
 228                 }
 229
 230                 // ============= IConvertible Methods ============ //
 231                 public TypeCode GetTypeCode ()
 232                 {
 233                         return TypeCode.Single;
 234                 }
 235
 236                 bool IConvertible.ToBoolean (IFormatProvider provider)
 237                 {
 238                         return System.Convert.ToBoolean (m_value);
 239                 }
 240
 241                 byte IConvertible.ToByte (IFormatProvider provider)
 242                 {
 243                         return System.Convert.ToByte (m_value);
 244                 }
 245
 246                 char IConvertible.ToChar (IFormatProvider provider)
 247                 {
 248                         return System.Convert.ToChar (m_value);
 249                 }
 250
 251                 DateTime IConvertible.ToDateTime (IFormatProvider provider)
 252                 {
 253                         return System.Convert.ToDateTime (m_value);
 254                 }
 255
 256                 decimal IConvertible.ToDecimal (IFormatProvider provider)
 257                 {
 258                         return System.Convert.ToDecimal (m_value);
 259                 }
 260
 261                 double IConvertible.ToDouble (IFormatProvider provider)
 262                 {
 263                         return System.Convert.ToDouble (m_value);
 264                 }
 265
 266                 short IConvertible.ToInt16 (IFormatProvider provider)
 267                 {
 268                         return System.Convert.ToInt16 (m_value);
 269                 }
 270
 271                 int IConvertible.ToInt32 (IFormatProvider provider)
 272                 {
 273                         return System.Convert.ToInt32 (m_value);
 274                 }
 275
 276                 long IConvertible.ToInt64 (IFormatProvider provider)
 277                 {
 278                         return System.Convert.ToInt64 (m_value);
 279                 }
 280
 281                 sbyte IConvertible.ToSByte (IFormatProvider provider)
 282                 {
 283                         return System.Convert.ToSByte (m_value);
 284                 }
 285
 286                 float IConvertible.ToSingle (IFormatProvider provider)
 287                 {
 288                         return System.Convert.ToSingle (m_value);
 289                 }
 290
 291                 object IConvertible.ToType (Type conversionType, IFormatProvider provider)
 292                 {
 293                         return System.Convert.ToType (m_value, conversionType, provider);
 294                 }
 295
 296                 ushort IConvertible.ToUInt16 (IFormatProvider provider)
 297                 {
 298                         return System.Convert.ToUInt16 (m_value);
 299                 }
 300
 301                 uint IConvertible.ToUInt32 (IFormatProvider provider)
 302                 {
 303                         return System.Convert.ToUInt32 (m_value);
 304                 }
 305
 306                 ulong IConvertible.ToUInt64 (IFormatProvider provider)
 307                 {
 308                         return System.Convert.ToUInt64 (m_value);
 309                 }
 310         }
 311 }