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>, IEquatable <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 #pragma warning disable 1718
 159                         return (f != f);
 160 #pragma warning restore
 161                 }
 162
 163                 public static bool IsNegativeInfinity (float f)
 164                 {
 165                         return (f < 0.0f && (f == NegativeInfinity || f == PositiveInfinity));
 166                 }
 167
 168                 public static bool IsPositiveInfinity (float f)
 169                 {
 170                         return (f > 0.0f && (f == NegativeInfinity || f == PositiveInfinity));
 171                 }
 172
 173                 public static float Parse (string s)
 174                 {
 175                         double parsed_value = Double.Parse (
 176                                 s, (NumberStyles.Float | NumberStyles.AllowThousands), null);
 177                         if (parsed_value > (double) float.MaxValue)
 178                                 throw new OverflowException();
 179
 180                         return (float) parsed_value;
 181                 }
 182
 183                 public static float Parse (string s, IFormatProvider provider)
 184                 {
 185                         double parsed_value = Double.Parse (
 186                                 s, (NumberStyles.Float | NumberStyles.AllowThousands), provider);
 187                         if (parsed_value > (double) float.MaxValue)
 188                                 throw new OverflowException();
 189
 190                         return (float) parsed_value;
 191                 }
 192
 193                 public static float Parse (string s, NumberStyles style)
 194                 {
 195                         double parsed_value = Double.Parse (s, style, null);
 196                         if (parsed_value > (double) float.MaxValue)
 197                                 throw new OverflowException();
 198
 199                         return (float) parsed_value;
 200                 }
 201
 202                 public static float Parse (string s, NumberStyles style, IFormatProvider provider)
 203                 {
 204                         double parsed_value = Double.Parse (s, style, provider);
 205                         if (parsed_value > (double) float.MaxValue)
 206                                 throw new OverflowException();
 207
 208                         return (float) parsed_value;
 209                 }
 210 #if NET_2_0
 211                 public static bool TryParse (string s, NumberStyles style, IFormatProvider provider, out float result)
 212                 {
 213                         double parsed_value;
 214                         Exception exc;
 215                         if (!Double.Parse (s, style, provider, true, out parsed_value, out exc)) {
 216                                 result = 0;
 217                                 return false;
 218                         } else if (parsed_value > (double) float.MaxValue) {
 219                                 result = 0;
 220                                 return false;
 221                         }
 222                         result = (float) parsed_value;
 223                         return true;
 224                 }
 225
 226                 public static bool TryParse (string s, out float result)
 227                 {
 228                         return TryParse (s, NumberStyles.Any, null, out result);
 229                 }
 230 #endif
 231                 public override string ToString ()
 232                 {
 233                         return ToString (null, null);
 234                 }
 235
 236                 public string ToString (IFormatProvider provider)
 237                 {
 238                         return ToString (null, provider);
 239                 }
 240
 241                 public string ToString (string format)
 242                 {
 243                         return ToString (format, null);
 244                 }
 245
 246                 public string ToString (string format, IFormatProvider provider)
 247                 {
 248                         NumberFormatInfo nfi = NumberFormatInfo.GetInstance (provider);
 249                         return NumberFormatter.NumberToString (format, m_value, nfi);
 250                 }
 251
 252                 // ============= IConvertible Methods ============ //
 253                 public TypeCode GetTypeCode ()
 254                 {
 255                         return TypeCode.Single;
 256                 }
 257
 258                 bool IConvertible.ToBoolean (IFormatProvider provider)
 259                 {
 260                         return System.Convert.ToBoolean (m_value);
 261                 }
 262
 263                 byte IConvertible.ToByte (IFormatProvider provider)
 264                 {
 265                         return System.Convert.ToByte (m_value);
 266                 }
 267
 268                 char IConvertible.ToChar (IFormatProvider provider)
 269                 {
 270                         return System.Convert.ToChar (m_value);
 271                 }
 272
 273                 DateTime IConvertible.ToDateTime (IFormatProvider provider)
 274                 {
 275                         return System.Convert.ToDateTime (m_value);
 276                 }
 277
 278                 decimal IConvertible.ToDecimal (IFormatProvider provider)
 279                 {
 280                         return System.Convert.ToDecimal (m_value);
 281                 }
 282
 283                 double IConvertible.ToDouble (IFormatProvider provider)
 284                 {
 285                         return System.Convert.ToDouble (m_value);
 286                 }
 287
 288                 short IConvertible.ToInt16 (IFormatProvider provider)
 289                 {
 290                         return System.Convert.ToInt16 (m_value);
 291                 }
 292
 293                 int IConvertible.ToInt32 (IFormatProvider provider)
 294                 {
 295                         return System.Convert.ToInt32 (m_value);
 296                 }
 297
 298                 long IConvertible.ToInt64 (IFormatProvider provider)
 299                 {
 300                         return System.Convert.ToInt64 (m_value);
 301                 }
 302
 303                 sbyte IConvertible.ToSByte (IFormatProvider provider)
 304                 {
 305                         return System.Convert.ToSByte (m_value);
 306                 }
 307
 308                 float IConvertible.ToSingle (IFormatProvider provider)
 309                 {
 310                         return System.Convert.ToSingle (m_value);
 311                 }
 312
 313                 object IConvertible.ToType (Type conversionType, IFormatProvider provider)
 314                 {
 315                         return System.Convert.ToType (m_value, conversionType, provider);
 316                 }
 317
 318                 ushort IConvertible.ToUInt16 (IFormatProvider provider)
 319                 {
 320                         return System.Convert.ToUInt16 (m_value);
 321                 }
 322
 323                 uint IConvertible.ToUInt32 (IFormatProvider provider)
 324                 {
 325                         return System.Convert.ToUInt32 (m_value);
 326                 }
 327
 328                 ulong IConvertible.ToUInt64 (IFormatProvider provider)
 329                 {
 330                         return System.Convert.ToUInt64 (m_value);
 331                 }
 332         }
 333 }