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 namespace System
  36 {
  37         [Serializable]
  38         public struct Single : IComparable, IFormattable, IConvertible
  39 #if NET_2_0
  40                 , IComparable <float>
  41 #endif
  42         {
  43                 public const float Epsilon = 1.4e-45f;
  44                 public const float MaxValue =  3.40282346638528859e38f;
  45                 public const float MinValue = -3.40282346638528859e38f;
  46                 public const float NaN = 0.0f / 0.0f;
  47                 public const float PositiveInfinity =  1.0f / 0.0f;
  48                 public const float NegativeInfinity = -1.0f / 0.0f;
  49
  50                 internal float m_value;
  51
  52                 public int CompareTo (object v)
  53                 {
  54                         if (v == null)
  55                                 return 1;
  56
  57                         if (!(v is System.Single))
  58                                 throw new ArgumentException (Locale.GetText ("Value is not a System.Single."));
  59
  60                         float fv = (float)v;
  61
  62                         if (IsPositiveInfinity (m_value) && IsPositiveInfinity (fv))
  63                                 return 0;
  64
  65                         if (IsNegativeInfinity (m_value) && IsNegativeInfinity (fv))
  66                                 return 0;
  67
  68                         if (IsNaN (fv))
  69                                 if (IsNaN (m_value))
  70                                         return 0;
  71                                 else
  72                                         return 1;
  73
  74                         if (IsNaN (m_value))
  75                                 if (IsNaN (fv))
  76                                         return 0;
  77                                 else
  78                                         return -1;
  79
  80                         if (this.m_value == fv)
  81                                 return 0;
  82                         else if (this.m_value > fv)
  83                                 return 1;
  84                         else
  85                                 return -1;
  86                 }
  87
  88                 public override bool Equals (object o)
  89                 {
  90                         if (!(o is System.Single))
  91                                 return false;
  92
  93                         if (IsNaN ((float) o)) {
  94                                 return IsNaN (m_value);
  95                         }
  96
  97                         return ((float) o) == m_value;
  98                 }
  99
 100 #if NET_2_0
 101                 public int CompareTo (float value)
 102                 {
 103                         if (IsPositiveInfinity (m_value) && IsPositiveInfinity (value))
 104                                 return 0;
 105
 106                         if (IsNegativeInfinity (m_value) && IsNegativeInfinity (value))
 107                                 return 0;
 108
 109                         if (IsNaN (value))
 110                                 if (IsNaN (m_value))
 111                                         return 0;
 112                                 else
 113                                         return 1;
 114
 115                         if (IsNaN (m_value))
 116                                 if (IsNaN (value))
 117                                         return 0;
 118                                 else
 119                                         return -1;
 120
 121                         if (this.m_value == value)
 122                                 return 0;
 123                         else if (this.m_value > value)
 124                                 return 1;
 125                         else
 126                                 return -1;
 127                 }
 128
 129                 public bool Equals (float value)
 130                 {
 131                         if (IsNaN (value))
 132                                 return IsNaN (m_value);
 133
 134                         return value == m_value;
 135                 }
 136 #endif
 137
 138                 public unsafe override int GetHashCode ()
 139                 {
 140                         float f = m_value;
 141                         return *((int*)&f);
 142                 }
 143
 144                 public static bool IsInfinity (float f)
 145                 {
 146                         return (f == PositiveInfinity || f == NegativeInfinity);
 147                 }
 148
 149                 public static bool IsNaN (float f)
 150                 {
 151                         return (f != f);
 152                 }
 153
 154                 public static bool IsNegativeInfinity (float f)
 155                 {
 156                         return (f < 0.0f && (f == NegativeInfinity || f == PositiveInfinity));
 157                 }
 158
 159                 public static bool IsPositiveInfinity (float f)
 160                 {
 161                         return (f > 0.0f && (f == NegativeInfinity || f == PositiveInfinity));
 162                 }
 163
 164                 public static float Parse (string s)
 165                 {
 166                         double parsed_value = Double.Parse (
 167                                 s, (NumberStyles.Float | NumberStyles.AllowThousands), null);
 168                         if (parsed_value > (double) float.MaxValue)
 169                                 throw new OverflowException();
 170
 171                         return (float) parsed_value;
 172                 }
 173
 174                 public static float Parse (string s, IFormatProvider provider)
 175                 {
 176                         double parsed_value = Double.Parse (
 177                                 s, (NumberStyles.Float | NumberStyles.AllowThousands), provider);
 178                         if (parsed_value > (double) float.MaxValue)
 179                                 throw new OverflowException();
 180
 181                         return (float) parsed_value;
 182                 }
 183
 184                 public static float Parse (string s, NumberStyles style)
 185                 {
 186                         double parsed_value = Double.Parse (s, style, null);
 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, IFormatProvider provider)
 194                 {
 195                         double parsed_value = Double.Parse (s, style, provider);
 196                         if (parsed_value > (double) float.MaxValue)
 197                                 throw new OverflowException();
 198
 199                         return (float) parsed_value;
 200                 }
 201
 202                 public override string ToString ()
 203                 {
 204                         return ToString (null, null);
 205                 }
 206
 207                 public string ToString (IFormatProvider provider)
 208                 {
 209                         return ToString (null, provider);
 210                 }
 211
 212                 public string ToString (string format)
 213                 {
 214                         return ToString (format, null);
 215                 }
 216
 217                 public string ToString (string format, IFormatProvider provider)
 218                 {
 219                         if (provider is CultureInfo)
 220                                 return SingleFormatter.NumberToString (format, ((CultureInfo) provider).NumberFormat, m_value);
 221                         else
 222                                 return SingleFormatter.NumberToString (format, (NumberFormatInfo) provider, m_value);
 223                 }
 224
 225                 // ============= IConvertible Methods ============ //
 226                 public TypeCode GetTypeCode ()
 227                 {
 228                         return TypeCode.Single;
 229                 }
 230
 231                 bool IConvertible.ToBoolean (IFormatProvider provider)
 232                 {
 233                         return System.Convert.ToBoolean (m_value);
 234                 }
 235
 236                 byte IConvertible.ToByte (IFormatProvider provider)
 237                 {
 238                         return System.Convert.ToByte (m_value);
 239                 }
 240
 241                 char IConvertible.ToChar (IFormatProvider provider)
 242                 {
 243                         return System.Convert.ToChar (m_value);
 244                 }
 245
 246                 DateTime IConvertible.ToDateTime (IFormatProvider provider)
 247                 {
 248                         return System.Convert.ToDateTime (m_value);
 249                 }
 250
 251                 decimal IConvertible.ToDecimal (IFormatProvider provider)
 252                 {
 253                         return System.Convert.ToDecimal (m_value);
 254                 }
 255
 256                 double IConvertible.ToDouble (IFormatProvider provider)
 257                 {
 258                         return System.Convert.ToDouble (m_value);
 259                 }
 260
 261                 short IConvertible.ToInt16 (IFormatProvider provider)
 262                 {
 263                         return System.Convert.ToInt16 (m_value);
 264                 }
 265
 266                 int IConvertible.ToInt32 (IFormatProvider provider)
 267                 {
 268                         return System.Convert.ToInt32 (m_value);
 269                 }
 270
 271                 long IConvertible.ToInt64 (IFormatProvider provider)
 272                 {
 273                         return System.Convert.ToInt64 (m_value);
 274                 }
 275
 276                 sbyte IConvertible.ToSByte (IFormatProvider provider)
 277                 {
 278                         return System.Convert.ToSByte (m_value);
 279                 }
 280
 281                 float IConvertible.ToSingle (IFormatProvider provider)
 282                 {
 283                         return System.Convert.ToSingle (m_value);
 284                 }
 285
 286                 object IConvertible.ToType (Type conversionType, IFormatProvider provider)
 287                 {
 288                         return System.Convert.ToType (m_value, conversionType, provider);
 289                 }
 290
 291                 ushort IConvertible.ToUInt16 (IFormatProvider provider)
 292                 {
 293                         return System.Convert.ToUInt16 (m_value);
 294                 }
 295
 296                 uint IConvertible.ToUInt32 (IFormatProvider provider)
 297                 {
 298                         return System.Convert.ToUInt32 (m_value);
 299                 }
 300
 301                 ulong IConvertible.ToUInt64 (IFormatProvider provider)
 302                 {
 303                         return System.Convert.ToUInt64 (m_value);
 304                 }
 305         }
 306 }