mcs/class/corlib/System/Int32.cs

   1 //
   2 // System.Int32.cs
   3 //
   4 // Author:
   5 //   Miguel de Icaza (miguel@ximian.com)
   6 //
   7 // (C) Ximian, Inc.  http://www.ximian.com
   8 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System.Globalization;
  31 using System.Threading;
  32
  33 namespace System {
  34
  35         [Serializable]
  36         [System.Runtime.InteropServices.ComVisible (true)]
  37         public struct Int32 : IFormattable, IConvertible, IComparable, IComparable<Int32>, IEquatable <Int32>
  38         {
  39
  40                 public const int MaxValue = 0x7fffffff;
  41                 public const int MinValue = -2147483648;
  42
  43                 // This field is looked up by name in the runtime
  44                 internal int m_value;
  45
  46                 public int CompareTo (object value)
  47                 {
  48                         if (value == null)
  49                                 return 1;
  50
  51                         if (!(value is System.Int32))
  52                                 throw new ArgumentException (Locale.GetText ("Value is not a System.Int32"));
  53
  54                         int xv = (int) value;
  55                         if (m_value == xv)
  56                                 return 0;
  57                         if (m_value > xv)
  58                                 return 1;
  59                         else
  60                                 return -1;
  61                 }
  62
  63                 public override bool Equals (object obj)
  64                 {
  65                         if (!(obj is System.Int32))
  66                                 return false;
  67
  68                         return ((int) obj) == m_value;
  69                 }
  70
  71                 public override int GetHashCode ()
  72                 {
  73                         return m_value;
  74                 }
  75
  76                 public int CompareTo (int value)
  77                 {
  78                         if (m_value == value)
  79                                 return 0;
  80                         if (m_value > value)
  81                                 return 1;
  82                         else
  83                                 return -1;
  84                 }
  85
  86                 public bool Equals (int obj)
  87                 {
  88                         return obj == m_value;
  89                 }
  90
  91                 internal static bool ProcessTrailingWhitespace (bool tryParse, string s, int position, ref Exception exc)
  92                 {
  93                         int len = s.Length;
  94
  95                         for (int i = position; i < len; i++){
  96                                 char c = s [i];
  97
  98                                 if (c != 0 && !Char.IsWhiteSpace (c)){
  99                                         if (!tryParse)
 100                                                 exc = GetFormatException ();
 101                                         return false;
 102                                 }
 103                         }
 104                         return true;
 105                 }
 106
 107                 internal static bool Parse (string s, bool tryParse, out int result, out Exception exc)
 108                 {
 109                         int val = 0;
 110                         int len;
 111                         int i, sign = 1;
 112                         bool digits_seen = false;
 113
 114                         result = 0;
 115                         exc = null;
 116
 117                         if (s == null) {
 118                                 if (!tryParse)
 119                                         exc = new ArgumentNullException ("s");
 120                                 return false;
 121                         }
 122
 123                         len = s.Length;
 124
 125                         char c;
 126                         for (i = 0; i < len; i++){
 127                                 c = s [i];
 128                                 if (!Char.IsWhiteSpace (c))
 129                                         break;
 130                         }
 131
 132                         if (i == len) {
 133                                 if (!tryParse)
 134                                         exc = GetFormatException ();
 135                                 return false;
 136                         }
 137
 138                         c = s [i];
 139                         if (c == '+')
 140                                 i++;
 141                         else if (c == '-'){
 142                                 sign = -1;
 143                                 i++;
 144                         }
 145
 146                         for (; i < len; i++){
 147                                 c = s [i];
 148
 149                                 if (c == '\0') {
 150                                         i = len;
 151                                         continue;
 152                                 }
 153
 154                                 if (c >= '0' && c <= '9'){
 155                                         byte d = (byte) (c - '0');
 156
 157                                         if (val > (MaxValue/10))
 158                                                 goto overflow;
 159
 160                                         if (val == (MaxValue/10)){
 161                                                 if ((d > (MaxValue % 10)) && (sign == 1 || (d > ((MaxValue % 10) + 1))))
 162                                                         goto overflow;
 163                                                 if (sign == -1)
 164                                                         val = (val * sign * 10) - d;
 165                                                 else
 166                                                         val = (val * 10) + d;
 167
 168                                                 if (ProcessTrailingWhitespace (tryParse, s, i + 1, ref exc)){
 169                                                         result = val;
 170                                                         return true;
 171                                                 }
 172                                                 goto overflow;
 173                                         } else
 174                                                 val = val * 10 + d;
 175
 176                                         digits_seen = true;
 177                                 } else if (!ProcessTrailingWhitespace (tryParse, s, i, ref exc))
 178                                         return false;
 179                         }
 180                         if (!digits_seen) {
 181                                 if (!tryParse)
 182                                         exc = GetFormatException ();
 183                                 return false;
 184                         }
 185
 186                         if (sign == -1)
 187                                 result = val * sign;
 188                         else
 189                                 result = val;
 190
 191                         return true;
 192
 193                 overflow:
 194                         if (!tryParse)
 195                                 exc = new OverflowException ("Value is too large");
 196                         return false;
 197                 }
 198
 199                 public static int Parse (string s, IFormatProvider provider)
 200                 {
 201                         return Parse (s, NumberStyles.Integer, provider);
 202                 }
 203
 204                 public static int Parse (string s, NumberStyles style)
 205                 {
 206                         return Parse (s, style, null);
 207                 }
 208
 209                 internal static bool CheckStyle (NumberStyles style, bool tryParse, ref Exception exc)
 210                 {
 211                         if ((style & NumberStyles.AllowHexSpecifier) != 0) {
 212                                 NumberStyles ne = style ^ NumberStyles.AllowHexSpecifier;
 213                                 if ((ne & NumberStyles.AllowLeadingWhite) != 0)
 214                                         ne ^= NumberStyles.AllowLeadingWhite;
 215                                 if ((ne & NumberStyles.AllowTrailingWhite) != 0)
 216                                         ne ^= NumberStyles.AllowTrailingWhite;
 217                                 if (ne != 0) {
 218                                         if (!tryParse)
 219                                                 exc = new ArgumentException (
 220                                                         "With AllowHexSpecifier only " +
 221                                                         "AllowLeadingWhite and AllowTrailingWhite " +
 222                                                         "are permitted.");
 223                                         return false;
 224                                 }
 225                         } else if ((uint) style > (uint) NumberStyles.Any){
 226                                 if (!tryParse)
 227                                         exc = new ArgumentException ("Not a valid number style");
 228                                 return false;
 229                         }
 230
 231                         return true;
 232                 }
 233
 234                 internal static bool JumpOverWhite (ref int pos, string s, bool reportError, bool tryParse, ref Exception exc)
 235                 {
 236                         while (pos < s.Length && Char.IsWhiteSpace (s [pos]))
 237                                 pos++;
 238
 239                         if (reportError && pos >= s.Length) {
 240                                 if (!tryParse)
 241                                         exc = GetFormatException ();
 242                                 return false;
 243                         }
 244
 245                         return true;
 246                 }
 247
 248                 internal static void FindSign (ref int pos, string s, NumberFormatInfo nfi,
 249                                       ref bool foundSign, ref bool negative)
 250                 {
 251                         if ((pos + nfi.NegativeSign.Length) <= s.Length &&
 252                                 s.IndexOf (nfi.NegativeSign, pos, nfi.NegativeSign.Length) == pos) {
 253                                 negative = true;
 254                                 foundSign = true;
 255                                 pos += nfi.NegativeSign.Length;
 256                         }
 257                         else if ((pos + nfi.PositiveSign.Length) < s.Length &&
 258                                 s.IndexOf (nfi.PositiveSign, pos, nfi.PositiveSign.Length) == pos) {
 259                                 negative = false;
 260                                 pos += nfi.PositiveSign.Length;
 261                                 foundSign = true;
 262                         }
 263                 }
 264
 265                 internal static void FindCurrency (ref int pos,
 266                                                  string s,
 267                                                  NumberFormatInfo nfi,
 268                                                  ref bool foundCurrency)
 269                 {
 270                         if ((pos + nfi.CurrencySymbol.Length) <= s.Length &&
 271                              s.Substring (pos, nfi.CurrencySymbol.Length) == nfi.CurrencySymbol) {
 272                                 foundCurrency = true;
 273                                 pos += nfi.CurrencySymbol.Length;
 274                         }
 275                 }
 276
 277                 internal static bool FindExponent (ref int pos, string s, ref int exponent, bool tryParse, ref Exception exc)
 278                 {
 279                                 exponent = 0;
 280                                 long exp = 0; // temp long value
 281
 282                                 int i = s.IndexOfAny(new char [] {'e', 'E'}, pos);
 283                                 if (i < 0) {
 284                                         exc = null;
 285                                         return false;
 286                                 }
 287
 288                                 if (++i == s.Length) {
 289                                         exc = tryParse ? null : GetFormatException ();
 290                                         return true;
 291                                 }
 292
 293                                 // negative exponent not valid for Int32
 294                                 if (s [i] == '-') {
 295                                         exc = tryParse ? null : new OverflowException ("Value too large or too small.");
 296                                         return true;
 297                                 }
 298
 299                                 if (s [i] == '+' && ++i == s.Length) {
 300                                         exc = tryParse ? null : GetFormatException ();
 301                                         return true;
 302                                 }
 303
 304                                 for (; i < s.Length; i++) {
 305                                         if (!Char.IsDigit (s [i]))  {
 306                                                 exc = tryParse ? null : GetFormatException ();
 307                                                 return true;
 308                                         }
 309
 310                                         // Reduce the risk of throwing an overflow exc
 311                                         exp = checked (exp * 10 - (int) (s [i] - '0'));
 312                                         if (exp < Int32.MinValue || exp > Int32.MaxValue) {
 313                                                 exc = tryParse ? null : new OverflowException ("Value too large or too small.");
 314                                                 return true;
 315                                         }
 316                                 }
 317
 318                                 // exp value saved as negative
 319                                 exp = -exp;
 320
 321                                 exc = null;
 322                                 exponent = (int)exp;
 323                                 pos = i;
 324                                 return true;
 325                 }
 326
 327                 internal static bool FindOther (ref int pos,
 328                                               string s,
 329                                               string other)
 330                 {
 331                         if ((pos + other.Length) <= s.Length &&
 332                              s.Substring (pos, other.Length) == other) {
 333                                 pos += other.Length;
 334                                 return true;
 335                         }
 336
 337                         return false;
 338                 }
 339
 340                 internal static bool ValidDigit (char e, bool allowHex)
 341                 {
 342                         if (allowHex)
 343                                 return Char.IsDigit (e) || (e >= 'A' && e <= 'F') || (e >= 'a' && e <= 'f');
 344
 345                         return Char.IsDigit (e);
 346                 }
 347
 348                 internal static Exception GetFormatException ()
 349                 {
 350                         return new FormatException ("Input string was not in the correct format");
 351                 }
 352
 353                 internal static bool Parse (string s, NumberStyles style, IFormatProvider fp, bool tryParse, out int result, out Exception exc)
 354                 {
 355                         result = 0;
 356                         exc = null;
 357
 358                         if (s == null) {
 359                                 if (!tryParse)
 360                                         exc = new ArgumentNullException ();
 361                                 return false;
 362                         }
 363
 364                         if (s.Length == 0) {
 365                                 if (!tryParse)
 366                                         exc = GetFormatException ();
 367                                 return false;
 368                         }
 369
 370                         NumberFormatInfo nfi = null;
 371                         if (fp != null) {
 372                                 Type typeNFI = typeof (System.Globalization.NumberFormatInfo);
 373                                 nfi = (NumberFormatInfo) fp.GetFormat (typeNFI);
 374                         }
 375                         if (nfi == null)
 376                                 nfi = Thread.CurrentThread.CurrentCulture.NumberFormat;
 377
 378                         if (!CheckStyle (style, tryParse, ref exc))
 379                                 return false;
 380
 381                         bool AllowCurrencySymbol = (style & NumberStyles.AllowCurrencySymbol) != 0;
 382                         bool AllowHexSpecifier = (style & NumberStyles.AllowHexSpecifier) != 0;
 383                         bool AllowThousands = (style & NumberStyles.AllowThousands) != 0;
 384                         bool AllowDecimalPoint = (style & NumberStyles.AllowDecimalPoint) != 0;
 385                         bool AllowParentheses = (style & NumberStyles.AllowParentheses) != 0;
 386                         bool AllowTrailingSign = (style & NumberStyles.AllowTrailingSign) != 0;
 387                         bool AllowLeadingSign = (style & NumberStyles.AllowLeadingSign) != 0;
 388                         bool AllowTrailingWhite = (style & NumberStyles.AllowTrailingWhite) != 0;
 389                         bool AllowLeadingWhite = (style & NumberStyles.AllowLeadingWhite) != 0;
 390                         bool AllowExponent = (style & NumberStyles.AllowExponent) != 0;
 391
 392                         int pos = 0;
 393
 394                         if (AllowLeadingWhite && !JumpOverWhite (ref pos, s, true, tryParse, ref exc))
 395                                 return false;
 396
 397                         bool foundOpenParentheses = false;
 398                         bool negative = false;
 399                         bool foundSign = false;
 400                         bool foundCurrency = false;
 401
 402                         // Pre-number stuff
 403                         if (AllowParentheses && s [pos] == '(') {
 404                                 foundOpenParentheses = true;
 405                                 foundSign = true;
 406                                 negative = true; // MS always make the number negative when there parentheses
 407                                                  // even when NumberFormatInfo.NumberNegativePattern != 0!!!
 408                                 pos++;
 409                                 if (AllowLeadingWhite && !!JumpOverWhite (ref pos, s, true, tryParse, ref exc))
 410                                         return false;
 411
 412                                 if (s.Substring (pos, nfi.NegativeSign.Length) == nfi.NegativeSign) {
 413                                         if (!tryParse)
 414                                                 exc = GetFormatException ();
 415                                         return false;
 416                                 }
 417
 418                                 if (s.Substring (pos, nfi.PositiveSign.Length) == nfi.PositiveSign) {
 419                                         if (!tryParse)
 420                                                 exc = GetFormatException ();
 421                                         return false;
 422                                 }
 423                         }
 424
 425                         if (AllowLeadingSign && !foundSign) {
 426                                 // Sign + Currency
 427                                 FindSign (ref pos, s, nfi, ref foundSign, ref negative);
 428                                 if (foundSign) {
 429                                         if (AllowLeadingWhite && !JumpOverWhite (ref pos, s, true, tryParse, ref exc))
 430                                                 return false;
 431                                         if (AllowCurrencySymbol) {
 432                                                 FindCurrency (ref pos, s, nfi,
 433                                                               ref foundCurrency);
 434                                                 if (foundCurrency && AllowLeadingWhite &&
 435                                                                 !JumpOverWhite (ref pos, s, true, tryParse, ref exc))
 436                                                         return false;
 437                                         }
 438                                 }
 439                         }
 440
 441                         if (AllowCurrencySymbol && !foundCurrency) {
 442                                 // Currency + sign
 443                                 FindCurrency (ref pos, s, nfi, ref foundCurrency);
 444                                 if (foundCurrency) {
 445                                         if (AllowLeadingWhite && !JumpOverWhite (ref pos, s, true, tryParse, ref exc))
 446                                                 return false;
 447                                         if (foundCurrency) {
 448                                                 if (!foundSign && AllowLeadingSign) {
 449                                                         FindSign (ref pos, s, nfi, ref foundSign,
 450                                                                   ref negative);
 451                                                         if (foundSign && AllowLeadingWhite &&
 452                                                                         !JumpOverWhite (ref pos, s, true, tryParse, ref exc))
 453                                                                 return false;
 454                                                 }
 455                                         }
 456                                 }
 457                         }
 458
 459                         int number = 0;
 460                         int nDigits = 0;
 461                         bool decimalPointFound = false;
 462                         int digitValue;
 463                         char hexDigit;
 464                         int exponent = 0;
 465
 466                         // Number stuff
 467                         do {
 468
 469                                 if (!ValidDigit (s [pos], AllowHexSpecifier)) {
 470                                         if (AllowThousands &&
 471                                             FindOther (ref pos, s, nfi.NumberGroupSeparator))
 472                                             continue;
 473                                         else
 474                                         if (!decimalPointFound && AllowDecimalPoint &&
 475                                             FindOther (ref pos, s, nfi.NumberDecimalSeparator)) {
 476                                             decimalPointFound = true;
 477                                             continue;
 478                                         }
 479
 480                                         break;
 481                                 }
 482                                 else if (AllowHexSpecifier) {
 483                                         nDigits++;
 484                                         hexDigit = s [pos++];
 485                                         if (Char.IsDigit (hexDigit))
 486                                                 digitValue = (int) (hexDigit - '0');
 487                                         else if (Char.IsLower (hexDigit))
 488                                                 digitValue = (int) (hexDigit - 'a' + 10);
 489                                         else
 490                                                 digitValue = (int) (hexDigit - 'A' + 10);
 491
 492                                         uint unumber = (uint)number;
 493                                         if (tryParse){
 494                                                 if ((unumber & 0xf0000000) != 0)
 495                                                         return false;
 496
 497                                                 number = (int) (unumber * 16u + (uint) digitValue);
 498                                         } else {
 499                                                 number = (int)checked (unumber * 16u + (uint)digitValue);
 500                                         }
 501                                 }
 502                                 else if (decimalPointFound) {
 503                                         nDigits++;
 504                                         // Allows decimal point as long as it's only
 505                                         // followed by zeroes.
 506                                         if (s [pos++] != '0') {
 507                                                 if (!tryParse)
 508                                                         exc = new OverflowException ("Value too large or too " +
 509                                                                         "small.");
 510                                                 return false;
 511                                         }
 512                                 }
 513                                 else {
 514                                         nDigits++;
 515
 516                                         try {
 517                                                 // Calculations done as negative
 518                                                 // (abs (MinValue) > abs (MaxValue))
 519                                                 number = checked (
 520                                                         number * 10 -
 521                                                         (int) (s [pos++] - '0')
 522                                                         );
 523                                         } catch (OverflowException) {
 524                                                 if (!tryParse)
 525                                                         exc = new OverflowException ("Value too large or too " +
 526                                                                         "small.");
 527                                                 return false;
 528                                         }
 529                                 }
 530                         } while (pos < s.Length);
 531
 532                         // Post number stuff
 533                         if (nDigits == 0) {
 534                                 if (!tryParse)
 535                                         exc = GetFormatException ();
 536                                 return false;
 537                         }
 538
 539                         if (AllowExponent)
 540                                 if (FindExponent (ref pos, s, ref exponent, tryParse, ref exc) && exc != null)
 541                                         return false;
 542
 543                         if (AllowTrailingSign && !foundSign) {
 544                                 // Sign + Currency
 545                                 FindSign (ref pos, s, nfi, ref foundSign, ref negative);
 546                                 if (foundSign) {
 547                                         if (AllowTrailingWhite && !JumpOverWhite (ref pos, s, true, tryParse, ref exc))
 548                                                 return false;
 549                                         if (AllowCurrencySymbol)
 550                                                 FindCurrency (ref pos, s, nfi,
 551                                                               ref foundCurrency);
 552                                 }
 553                         }
 554
 555                         if (AllowCurrencySymbol && !foundCurrency) {
 556                                 // Currency + sign
 557                                 FindCurrency (ref pos, s, nfi, ref foundCurrency);
 558                                 if (foundCurrency) {
 559                                         if (AllowTrailingWhite && !JumpOverWhite (ref pos, s, true, tryParse, ref exc))
 560                                                 return false;
 561                                         if (!foundSign && AllowTrailingSign)
 562                                                 FindSign (ref pos, s, nfi, ref foundSign,
 563                                                           ref negative);
 564                                 }
 565                         }
 566
 567                         if (AllowTrailingWhite && pos < s.Length && !JumpOverWhite (ref pos, s, false, tryParse, ref exc))
 568                                 return false;
 569
 570                         if (foundOpenParentheses) {
 571                                 if (pos >= s.Length || s [pos++] != ')') {
 572                                         if (!tryParse)
 573                                                 exc = GetFormatException ();
 574                                         return false;
 575                                 }
 576                                 if (AllowTrailingWhite && pos < s.Length &&
 577                                                 !JumpOverWhite (ref pos, s, false, tryParse, ref exc))
 578                                         return false;
 579                         }
 580
 581                         if (pos < s.Length && s [pos] != '\u0000') {
 582                                 if (!tryParse)
 583                                         exc = GetFormatException ();
 584                                 return false;
 585                         }
 586
 587                         if (!negative && !AllowHexSpecifier){
 588                                 if (tryParse){
 589                                         long lval = -((long)number);
 590
 591                                         if (lval < MinValue || lval > MaxValue)
 592                                                 return false;
 593                                         number = (int) lval;
 594                                 } else
 595                                         number = checked (-number);
 596                         }
 597
 598                         // result *= 10^exponent
 599                         if (exponent > 0) {
 600                                 // Reduce the risk of throwing an overflow exc
 601                                 double res = checked (Math.Pow (10, exponent) * number);
 602                                 if (res < Int32.MinValue || res > Int32.MaxValue) {
 603                                         if (!tryParse)
 604                                                 exc = new OverflowException ("Value too large or too small.");
 605                                         return false;
 606                                 }
 607
 608                                 number = (int)res;
 609                         }
 610
 611                         result = number;
 612
 613                         return true;
 614                 }
 615
 616                 public static int Parse (string s)
 617                 {
 618                         Exception exc;
 619                         int res;
 620
 621                         if (!Parse (s, false, out res, out exc))
 622                                 throw exc;
 623
 624                         return res;
 625                 }
 626
 627                 public static int Parse (string s, NumberStyles style, IFormatProvider provider)
 628                 {
 629                         Exception exc;
 630                         int res;
 631
 632                         if (!Parse (s, style, provider, false, out res, out exc))
 633                                 throw exc;
 634
 635                         return res;
 636                 }
 637
 638                 public static bool TryParse (string s, out int result)
 639                 {
 640                         Exception exc;
 641
 642                         if (!Parse (s, true, out result, out exc)) {
 643                                 result = 0;
 644                                 return false;
 645                         }
 646
 647                         return true;
 648                 }
 649
 650                 public static bool TryParse (string s, NumberStyles style, IFormatProvider provider, out int result)
 651                 {
 652                         Exception exc;
 653                         if (!Parse (s, style, provider, true, out result, out exc)) {
 654                                 result = 0;
 655                                 return false;
 656                         }
 657
 658                         return true;
 659                 }
 660
 661                 public override string ToString ()
 662                 {
 663                         return NumberFormatter.NumberToString (m_value, null);
 664                 }
 665
 666                 public string ToString (IFormatProvider provider)
 667                 {
 668                         return NumberFormatter.NumberToString (m_value, provider);
 669                 }
 670
 671                 public string ToString (string format)
 672                 {
 673                         return ToString (format, null);
 674                 }
 675
 676                 public string ToString (string format, IFormatProvider provider)
 677                 {
 678                         return NumberFormatter.NumberToString (format, m_value, provider);
 679                 }
 680
 681                 // =========== IConvertible Methods =========== //
 682
 683                 public TypeCode GetTypeCode ()
 684                 {
 685                         return TypeCode.Int32;
 686                 }
 687
 688                 bool IConvertible.ToBoolean (IFormatProvider provider)
 689                 {
 690                         return System.Convert.ToBoolean (m_value);
 691                 }
 692
 693                 byte IConvertible.ToByte (IFormatProvider provider)
 694                 {
 695                         return System.Convert.ToByte (m_value);
 696                 }
 697
 698                 char IConvertible.ToChar (IFormatProvider provider)
 699                 {
 700                         return System.Convert.ToChar (m_value);
 701                 }
 702
 703                 DateTime IConvertible.ToDateTime (IFormatProvider provider)
 704                 {
 705                         return System.Convert.ToDateTime (m_value);
 706                 }
 707
 708                 decimal IConvertible.ToDecimal (IFormatProvider provider)
 709                 {
 710                         return System.Convert.ToDecimal (m_value);
 711                 }
 712
 713                 double IConvertible.ToDouble (IFormatProvider provider)
 714                 {
 715                         return System.Convert.ToDouble (m_value);
 716                 }
 717
 718                 short IConvertible.ToInt16 (IFormatProvider provider)
 719                 {
 720                         return System.Convert.ToInt16 (m_value);
 721                 }
 722
 723                 int IConvertible.ToInt32 (IFormatProvider provider)
 724                 {
 725                         return m_value;
 726                 }
 727
 728                 long IConvertible.ToInt64 (IFormatProvider provider)
 729                 {
 730                         return System.Convert.ToInt64 (m_value);
 731                 }
 732
 733                 sbyte IConvertible.ToSByte (IFormatProvider provider)
 734                 {
 735                         return System.Convert.ToSByte (m_value);
 736                 }
 737
 738                 float IConvertible.ToSingle (IFormatProvider provider)
 739                 {
 740                         return System.Convert.ToSingle (m_value);
 741                 }
 742
 743                 object IConvertible.ToType (Type targetType, IFormatProvider provider)
 744                 {
 745                         if (targetType == null)
 746                                 throw new ArgumentNullException ("targetType");
 747                         return System.Convert.ToType (m_value, targetType, provider, false);
 748                 }
 749
 750                 ushort IConvertible.ToUInt16 (IFormatProvider provider)
 751                 {
 752                         return System.Convert.ToUInt16 (m_value);
 753                 }
 754
 755                 uint IConvertible.ToUInt32 (IFormatProvider provider)
 756                 {
 757                         return System.Convert.ToUInt32 (m_value);
 758                 }
 759
 760                 ulong IConvertible.ToUInt64 (IFormatProvider provider)
 761                 {
 762                         return System.Convert.ToUInt64 (m_value);
 763                 }
 764         }
 765 }