interpreter/preprocessor/faust-0.9.47mr3/compiler/headers/num.hh

   1 /************************************************************************
   2  ************************************************************************
   3     FAUST compiler
   4         Copyright (C) 2003-2004 GRAME, Centre National de Creation Musicale
   5     ---------------------------------------------------------------------
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  ************************************************************************
  20  ************************************************************************/
  21
  22
  23
  24 /*****************************************************************************
  25 ******************************************************************************
  26                                                                 NUM
  27                                                 Y. Orlarey, (c) Grame 2002
  28 ------------------------------------------------------------------------------
  29 Nums are tagged unions of ints and floats. Nums are completly described by
  30 the num.h file, there is no num.cpp file.
  31
  32  API:
  33  ----
  34         num(10);                                : num with int content
  35         num(3.14159);                   : num with double content
  36
  37         num op num                              : op is any C binary operator
  38
  39         type(num)                               : 0 = int, 1 = double
  40         int(num);                               : int content of num or conversion
  41         double(num);                            : double content of num or conversion
  42
  43  History :
  44  ---------
  45         2002-02-08 : First version
  46
  47 ******************************************************************************
  48 *****************************************************************************/
  49
  50
  51 #ifndef     __NUM__
  52 #define     __NUM__
  53
  54
  55 //-------------------------------------------------------------------------
  56 // Class num = (int x (int + double))
  57 //-------------------------------------------------------------------------
  58 class num
  59 {
  60         int             fType;
  61         union {
  62                 int     i;
  63                 double  f;
  64         } fData;
  65
  66  public:
  67         // constructeurs
  68         num (int x=0)           : fType(0)                      { fData.i = x; }
  69         //num (double x)                : fType(1)              { fData.f = (double)x; }
  70         num (double x)          : fType(1)              { fData.f = x; }
  71         num (const num& n)      : fType(n.fType)        { fData.i = n.fData.i; }
  72
  73         num& operator = (int n)         { fType = 0; fData.i = n; return *this; }
  74         num& operator = (double n)      { fType = 1; fData.f = n; return *this; }
  75
  76         // predicats
  77         bool operator == (const num& n) const { return fType == n.fType && fData.i == n.fData.i; }
  78         bool operator != (const num& n) const { return fType != n.fType || fData.i != n.fData.i; }
  79
  80         // accessors
  81         int                     type()          const   { return fType; }
  82         operator        int()           const   { return (fType) ? int(fData.f) : fData.i; }
  83         operator        double()        const   { return (fType) ? fData.f : double(fData.i); }
  84
  85 };
  86
  87
  88 inline int isfloat (const num& n) { return n.type(); }
  89
  90 inline const num operator+ (const num& x, const num& y)
  91         { return (isfloat(x)|isfloat(y)) ? num(double(x)+double(y)) : num(int(x)+int(y)); }
  92
  93 inline const num operator- (const num& x, const num& y)
  94         { return (isfloat(x)|isfloat(y)) ? num(double(x)-double(y)) : num(int(x)-int(y)); }
  95
  96 inline const num operator* (const num& x, const num& y)
  97         { return (isfloat(x)|isfloat(y)) ? num(double(x)*double(y)) : num(int(x)*int(y)); }
  98
  99 inline const num operator/ (const num& x, const num& y)
 100         { return (isfloat(x)|isfloat(y)) ? num(double(x)/double(y)) : num(int(x)/int(y)); }
 101
 102 inline const num operator% (const num& x, const num& y)
 103         { return num(int(x)%int(y)); }
 104
 105
 106 // operations sur les bits
 107 inline const num operator<< (const num& x, const num& y)
 108         { return num(int(x)<<int(y)); }
 109
 110 inline const num operator>> (const num& x, const num& y)
 111         { return num(int(x)>>int(y)); }
 112
 113
 114 // operations booléennes sur les bits
 115 inline const num operator& (const num& x, const num& y)
 116         { return num(int(x)&int(y)); }
 117
 118 inline const num operator| (const num& x, const num& y)
 119         { return num(int(x)|int(y)); }
 120
 121 inline const num operator^ (const num& x, const num& y)
 122         { return num(int(x)^int(y)); }
 123
 124
 125 // operations de comparaison
 126 inline const num operator> (const num& x, const num& y)
 127         { return (isfloat(x)|isfloat(y)) ? num(double(x)>double(y)) : num(int(x)>int(y)); }
 128
 129 inline const num operator< (const num& x, const num& y)
 130         { return (isfloat(x)|isfloat(y)) ? num(double(x)<double(y)) : num(int(x)<int(y)); }
 131
 132 inline const num operator>= (const num& x, const num& y)
 133         { return (isfloat(x)|isfloat(y)) ? num(double(x)>=double(y)) : num(int(x)>=int(y)); }
 134
 135 inline const num operator<= (const num& x, const num& y)
 136         { return (isfloat(x)|isfloat(y)) ? num(double(x)<=double(y)) : num(int(x)<=int(y)); }
 137
 138 inline const num operator== (const num& x, const num& y)
 139         { return (isfloat(x)|isfloat(y)) ? num(double(x)==double(y)) : num(int(x)==int(y)); }
 140
 141 inline const num operator!= (const num& x, const num& y)
 142         { return (isfloat(x)|isfloat(y)) ? num(double(x)!=double(y)) : num(int(x)!=int(y)); }
 143
 144
 145 #endif