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#pike __REAL_VERSION__ 
 
//! Returns the parity of the integer @[value]. If the 
//! parity is odd 1 is returned. If it is even 0 is 
//! returned. 
int(0..1) parity(int(0..) value) { 
  if(value<0) error("Parity can not determined for negative values.\n"); 
  return Gmp.mpz(value)->popcount()&1; 
} 
 
constant NATIVE_MIN = __builtin.NATIVE_INT_MIN; 
constant NATIVE_MAX = __builtin.NATIVE_INT_MAX; 
 
//! @decl constant NATIVE_MIN; 
//! @decl constant NATIVE_MAX; 
//! 
//! The limits for using the native representation of integers on the 
//! current architecture. Any integer that is outside this range uses 
//! a more complex and slower representation. Also, some builtin 
//! functions that don't expect very large integers might start to 
//! complain about invalid argument type when given values outside 
//! this range (they typically say something like "Expected integer, 
//! got object"). 
//! 
//! @[NATIVE_MIN] is not greater than @expr{-2147483648@} 
//! (@expr{-0x80000000@}). 
//! 
//! @[NATIVE_MAX] is not less than @expr{2147483647@} 
//! (@expr{0x7fffffff@}). 
//! 
//! @note 
//! The size of the native integers can be controlled when Pike is 
//! compiled with the configure flags @expr{--with-int-int@}, 
//! @expr{--with-long-int@}, and @expr{--with-long-long-int@}. The 
//! default is to use the longest available integer type that fits 
//! inside a pointer, which typically means that it's 64 bit on "true" 
//! 64 bit architectures. 
//! 
//! @note 
//! If Pike is compiled with the configure flag 
//! @expr{--without-bignum@} (which is discouraged), then all 
//! arithmetic operations will instead silently wrap around at these 
//! limits. 
 
//! Swaps the upper and lower byte in a word. 
int(0..65535) swap_word(int(0..65535) i) { 
  return ((i&255)<<8) | ((i&(255<<8))>>8); 
} 
 
//! Swaps the upper and lower word in a longword, and the upper and 
//! lower bytes in the words. Simply put, the bytes are reversed. 
int(0..4294967295) swap_long(int(0..4294967295) i) { 
  return ((i&255)<<24) | ((i&(255<<8))<<8) | 
    ((i&(255<<16))>>8) | ((i&(255<<24))>>24); 
} 
 
static class Inf { 
 
  static constant neg = 0; 
  static int __hash() { return 17; } 
  static int(0..1) _equal(mixed arg) { 
    if(neg && arg==-Math.inf) return 1; 
    if(!neg && arg==Math.inf) return 1; 
    return arg==this; 
  } 
  static int(0..1) _is_type(mixed type) { return (< "int", "object" >)[type]; } 
  static mixed _random() { return this; } 
  static mixed _sqrt() { return this; } 
  // % == nan 
  // & == nan 
  static mixed `*(mixed ... args) { 
    int n = neg; 
    foreach(args, mixed arg) 
      if(arg<0) n = !n; 
    if(n) return ninf; 
    return inf; 
  } 
  static mixed ``*(mixed ... args) { return `*(@args); } 
  static mixed `+(mixed ... args) { 
    foreach(args, mixed arg) 
      if(arg==`-()) error("NaN\n"); 
    return this; 
  } 
  static mixed ``+(mixed ... args) { return ``+(@args); } 
  static mixed `-(mixed ... args) { 
    if(!sizeof(args)) { 
      if(neg) return inf; 
      return ninf; 
    } 
    foreach(args, mixed arg) 
      if(arg==inf || arg==ninf) error("NaN\n"); 
    return this; 
  } 
  static mixed ``-(mixed arg) { 
    if(arg==inf || arg==ninf) error("NaN\n"); 
    return this; 
  } 
  static int(0..1) `<(mixed arg) { 
    if(arg==this) return 0; 
    return neg; 
  } 
  static int(0..1) `>(mixed arg) { 
    if(arg==this) return 0; 
    return !neg; 
  } 
  static mixed `~() { return `-(); } 
  static mixed `<<(mixed arg) { 
    if(arg<0) error("Got negative shift count.\n"); 
    return this; 
  } 
  static mixed ``<<(mixed arg) { 
    if(arg<0) return ninf; 
    return inf; 
  } 
  static mixed `>>(mixed arg) { 
    if(arg<0) error("Got negative shift count.\n"); 
    return this; 
  } 
  static mixed ``>>(mixed arg) { 
    return 0; 
  } 
  static mixed cast(string to) { 
    switch(to) { 
    case "string": 
      return "inf"; 
    case "float": 
      return Math.inf; 
    default: 
      error("Can not cast to %O.\n", to); 
    } 
  } 
  static string _sprintf(int t) { 
    return t=='O' && (neg?"-":"")+"Int.inf"; 
  } 
} 
 
class NInf { 
  inherit Inf; 
  constant neg = 1; 
} 
 
static Inf ninf = NInf(); 
 
//! An infinite number. 
Inf inf = Inf();