flower/include/real.hh

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond 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 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond 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 LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #ifndef REAL_HH
  21 #define REAL_HH
  22
  23 #include <algorithm>
  24 #include <climits>
  25 #include <cmath>
  26 using namespace std;
  27
  28 typedef double Real;
  29 extern const Real infinity_f;
  30
  31 /* namespace std { */
  32
  33 template<class T> inline T abs (T x)
  34 {
  35   return x > 0 ? x : -x;
  36 }
  37
  38 /* } namespace std */
  39
  40 inline Real
  41 distance (Real x, Real y)
  42 {
  43   return abs (x - y);
  44 }
  45
  46 template<class T> inline int sign (T x)
  47 {
  48   if (x)
  49     return x > T (0) ? 1 : -1;
  50   return 0;
  51 }
  52
  53 template<class T> inline T sqr (T x)
  54 {
  55   return x * x;
  56 }
  57
  58 #endif