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 using System.Runtime.ConstrainedExecution;
  35
  36 namespace System
  37 {
  38         [Serializable]
  39         [System.Runtime.InteropServices.ComVisible (true)]
  40         public struct Single : IComparable, IFormattable, IConvertible, IComparable <float>, IEquatable <float>
  41         {
  42                 public const float Epsilon = 1.4e-45f;
  43                 public const float MaxValue =  3.40282346638528859e38f;
  44                 public const float MinValue = -3.40282346638528859e38f;
  45                 public const float NaN = 0.0f / 0.0f;
  46                 public const float PositiveInfinity =  1.0f / 0.0f;
  47                 public const float NegativeInfinity = -1.0f / 0.0f;
  48
  49                 internal float m_value;
  50
  51                 public int CompareTo (object value)
  52                 {
  53                         if (value == null)
  54                                 return 1;
  55
  56                         if (!(value is System.Single))
  57                                 throw new ArgumentException (Locale.GetText ("Value is not a System.Single."));
  58
  59                         float fv = (float)value;
  60
  61                         if (IsPositiveInfinity (m_value) && IsPositiveInfinity (fv))
  62                                 return 0;
  63
  64                         if (IsNegativeInfinity (m_value) && IsNegativeInfinity (fv))
  65                                 return 0;
  66
  67                         if (IsNaN (fv))
  68                                 if (IsNaN (m_value))
  69                                         return 0;
  70                                 else
  71                                         return 1;
  72
  73                         if (IsNaN (m_value))
  74                                 if (IsNaN (fv))
  75                                         return 0;
  76                                 else
  77                                         return -1;
  78
  79                         if (this.m_value == fv)
  80                                 return 0;
  81                         else if (this.m_value > fv)
  82                                 return 1;
  83                         else
  84                                 return -1;
  85                 }
  86
  87                 public override bool Equals (object obj)
  88                 {
  89                         if (!(obj is System.Single))
  90                                 return false;
  91
  92                         float value = (float) obj;
  93
  94                         if (IsNaN (value))
  95                                 return IsNaN (m_value);
  96
  97                         return (value == m_value);
  98                 }
  99
 100                 public int CompareTo (float value)
 101                 {
 102                         if (IsPositiveInfinity (m_value) && IsPositiveInfinity (value))
 103                                 return 0;
 104
 105                         if (IsNegativeInfinity (m_value) && IsNegativeInfinity (value))
 106                                 return 0;
 107
 108                         if (IsNaN (value))
 109                                 if (IsNaN (m_value))
 110                                         return 0;
 111                                 else
 112                                         return 1;
 113
 114                         if (IsNaN (m_value))
 115                                 if (IsNaN (value))
 116                                         return 0;
 117                                 else
 118                                         return -1;
 119
 120                         if (this.m_value == value)
 121                                 return 0;
 122                         else if (this.m_value > value)
 123                                 return 1;
 124                         else
 125                                 return -1;
 126                 }
 127
 128                 public bool Equals (float obj)
 129                 {
 130                         if (IsNaN (obj))
 131                                 return IsNaN (m_value);
 132
 133                         return obj == m_value;
 134                 }
 135
 136                 public unsafe override int GetHashCode ()
 137                 {
 138                         float f = m_value;
 139                         return *((int*)&f);
 140                 }
 141
 142                 public static bool IsInfinity (float f)
 143                 {
 144                         return (f == PositiveInfinity || f == NegativeInfinity);
 145                 }
 146
 147                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 148                 public static bool IsNaN (float f)
 149                 {
 150 #pragma warning disable 1718
 151                         return (f != f);
 152 #pragma warning restore
 153                 }
 154
 155                 public static bool IsNegativeInfinity (float f)
 156                 {
 157                         return (f < 0.0f && (f == NegativeInfinity || f == PositiveInfinity));
 158                 }
 159
 160                 public static bool IsPositiveInfinity (float f)
 161                 {
 162                         return (f > 0.0f && (f == NegativeInfinity || f == PositiveInfinity));
 163                 }
 164
 165                 public static float Parse (string s)
 166                 {
 167                         double parsed_value = Double.Parse (
 168                                 s, (NumberStyles.Float | NumberStyles.AllowThousands), null);
 169                         if (parsed_value > (double) float.MaxValue)
 170                                 throw new OverflowException();
 171
 172                         return (float) parsed_value;
 173                 }
 174
 175                 public static float Parse (string s, IFormatProvider provider)
 176                 {
 177                         double parsed_value = Double.Parse (
 178                                 s, (NumberStyles.Float | NumberStyles.AllowThousands), provider);
 179                         if (parsed_value > (double) float.MaxValue)
 180                                 throw new OverflowException();
 181
 182                         return (float) parsed_value;
 183                 }
 184
 185                 public static float Parse (string s, NumberStyles style)
 186                 {
 187                         double parsed_value = Double.Parse (s, style, null);
 188                         if (parsed_value > (double) float.MaxValue)
 189                                 throw new OverflowException();
 190
 191                         return (float) parsed_value;
 192                 }
 193
 194                 public static float Parse (string s, NumberStyles style, IFormatProvider provider)
 195                 {
 196                         double parsed_value = Double.Parse (s, style, provider);
 197                         if (parsed_value > (double) float.MaxValue)
 198                                 throw new OverflowException();
 199
 200                         return (float) parsed_value;
 201                 }
 202                 public static bool TryParse (string s, NumberStyles style, IFormatProvider provider, out float result)
 203                 {
 204                         double parsed_value;
 205                         Exception exc;
 206                         if (!Double.Parse (s, style, provider, true, out parsed_value, out exc)) {
 207                                 result = 0;
 208                                 return false;
 209                         } else if (parsed_value > (double) float.MaxValue) {
 210                                 result = 0;
 211                                 return false;
 212                         }
 213                         result = (float) parsed_value;
 214                         return true;
 215                 }
 216
 217                 public static bool TryParse (string s, out float result)
 218                 {
 219                         return TryParse (s, NumberStyles.Any, null, out result);
 220                 }
 221
 222                 public override string ToString ()
 223                 {
 224                         return NumberFormatter.NumberToString (m_value, null);
 225                 }
 226
 227                 public string ToString (IFormatProvider provider)
 228                 {
 229                         return NumberFormatter.NumberToString (m_value, provider);
 230                 }
 231
 232                 public string ToString (string format)
 233                 {
 234                         return ToString (format, null);
 235                 }
 236
 237                 public string ToString (string format, IFormatProvider provider)
 238                 {
 239                         return NumberFormatter.NumberToString (format, m_value, provider);
 240                 }
 241
 242                 // ============= IConvertible Methods ============ //
 243                 public TypeCode GetTypeCode ()
 244                 {
 245                         return TypeCode.Single;
 246                 }
 247
 248                 bool IConvertible.ToBoolean (IFormatProvider provider)
 249                 {
 250                         return System.Convert.ToBoolean (m_value);
 251                 }
 252
 253                 byte IConvertible.ToByte (IFormatProvider provider)
 254                 {
 255                         return System.Convert.ToByte (m_value);
 256                 }
 257
 258                 char IConvertible.ToChar (IFormatProvider provider)
 259                 {
 260                         return System.Convert.ToChar (m_value);
 261                 }
 262
 263                 DateTime IConvertible.ToDateTime (IFormatProvider provider)
 264                 {
 265                         return System.Convert.ToDateTime (m_value);
 266                 }
 267
 268                 decimal IConvertible.ToDecimal (IFormatProvider provider)
 269                 {
 270                         return System.Convert.ToDecimal (m_value);
 271                 }
 272
 273                 double IConvertible.ToDouble (IFormatProvider provider)
 274                 {
 275                         return System.Convert.ToDouble (m_value);
 276                 }
 277
 278                 short IConvertible.ToInt16 (IFormatProvider provider)
 279                 {
 280                         return System.Convert.ToInt16 (m_value);
 281                 }
 282
 283                 int IConvertible.ToInt32 (IFormatProvider provider)
 284                 {
 285                         return System.Convert.ToInt32 (m_value);
 286                 }
 287
 288                 long IConvertible.ToInt64 (IFormatProvider provider)
 289                 {
 290                         return System.Convert.ToInt64 (m_value);
 291                 }
 292
 293                 sbyte IConvertible.ToSByte (IFormatProvider provider)
 294                 {
 295                         return System.Convert.ToSByte (m_value);
 296                 }
 297
 298                 float IConvertible.ToSingle (IFormatProvider provider)
 299                 {
 300                         return System.Convert.ToSingle (m_value);
 301                 }
 302
 303                 object IConvertible.ToType (Type targetType, IFormatProvider provider)
 304                 {
 305                         if (targetType == null)
 306                                 throw new ArgumentNullException ("targetType");
 307                         return System.Convert.ToType (m_value, targetType, provider, false);
 308                 }
 309
 310                 ushort IConvertible.ToUInt16 (IFormatProvider provider)
 311                 {
 312                         return System.Convert.ToUInt16 (m_value);
 313                 }
 314
 315                 uint IConvertible.ToUInt32 (IFormatProvider provider)
 316                 {
 317                         return System.Convert.ToUInt32 (m_value);
 318                 }
 319
 320                 ulong IConvertible.ToUInt64 (IFormatProvider provider)
 321                 {
 322                         return System.Convert.ToUInt64 (m_value);
 323                 }
 324         }
 325 }