/*
This file is part of LilyPond, the GNU music typesetter.
- Copyright (C) 1997--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
LilyPond is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#ifndef DIRECTION_HH
#define DIRECTION_HH
+#include <algorithm>
#include "axis.hh"
enum Direction
- {
- UP = 1,
- DOWN=-1,
- LEFT=-1,
- RIGHT = 1,
- MIN=-1,
- MAX = 1,
- CENTER = 0,
- SMALLER=-1,
- BIGGER = 1,
- START = -1,
- STOP = 1,
-
- /*
- This is necessary to safely write loops,
- since
-
- dir <= RIGHT
-
- is otherwise transformed into true unconditionally.
- */
- DIRECTION_LIMIT = 2,
- DIRECTION_NEG_LIMIT = -2,
- };
-
-inline Direction
-other_dir (Direction const d)
{
- return (Direction) (-d);
-}
+ UP = 1,
+ DOWN = -1,
+ LEFT = -1,
+ RIGHT = 1,
+ MIN = -1,
+ MAX = 1,
+ CENTER = 0,
+ SMALLER = -1,
+ BIGGER = 1,
+ START = -1,
+ STOP = 1,
+
+ /*
+ This is necessary to safely write loops,
+ since
+
+ dir <= RIGHT
+
+ is otherwise transformed into true unconditionally.
+ */
+ DIRECTION_LIMIT = 2,
+ DIRECTION_NEG_LIMIT = -2,
+};
inline Direction
-operator - (Direction const d)
+operator - (Direction d)
{
- return other_dir (d);
+ return Direction (- static_cast<int> (d)); // cast avoids recursion
}
-// huh?
-inline Direction
-flip (Direction *i)
-{
- if (*i == (Direction)1)
- *i = (Direction) - 1;
- else if (*i == (Direction) - 1)
- *i = (Direction)1;
- return *i;
-}
+#define UP_and_DOWN(d) \
+ Direction d = UP; d != CENTER; d = (d == UP ? DOWN : CENTER)
+
+#define DOWN_and_UP(d) \
+ Direction d = DOWN; d != CENTER; d = (d == DOWN ? UP : CENTER)
+
+#define LEFT_and_RIGHT(d) \
+ Direction d = LEFT; d != CENTER; d = (d == LEFT ? RIGHT : CENTER)
/**
if d > 0: the max operator
if d < 0: the min operator
*/
-template<class T> T minmax (Direction d, T, T);
-
-// String direction_string (Direction, Axis);
+template<class T> T minmax (Direction d, T a, T b)
+{
+ if (d == UP)
+ return max (a, b);
+ else
+ return min (a, b);
+}
#endif // DIRECTION_HH