// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
-// You should have received a copy of the GNU Library General Public
-// License along with this library; if not, write to the
-// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-// Boston, MA 02111-1307, USA.
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// $Id$
#ifndef _SG_INLINES_H
#define _SG_INLINES_H
+// return the sign of a value
template <class T>
-inline const int SG_SIGN(const T x) {
+inline int SG_SIGN(const T x) {
return x < T(0) ? -1 : 1;
}
+// return the minimum of two values
template <class T>
-inline const T SG_MIN2(const T a, const T b) {
+inline T SG_MIN2(const T a, const T b) {
return a < b ? a : b;
}
// return the minimum of three values
template <class T>
-inline const T SG_MIN3( const T a, const T b, const T c) {
+inline T SG_MIN3( const T a, const T b, const T c) {
return (a < b ? SG_MIN2 (a, c) : SG_MIN2 (b, c));
}
+// return the maximum of two values
template <class T>
-inline const T SG_MAX2(const T a, const T b) {
+inline T SG_MAX2(const T a, const T b) {
return a > b ? a : b;
}
// return the maximum of three values
template <class T>
-inline const T SG_MAX3 (const T a, const T b, const T c) {
+inline T SG_MAX3 (const T a, const T b, const T c) {
return (a > b ? SG_MAX2 (a, c) : SG_MAX2 (b, c));
}
-//
+// return the minimum and maximum of three values
+template <class T>
+inline void SG_MIN_MAX3 ( T &min, T &max, const T a, const T b, const T c) {
+ if( a > b ) {
+ if( a > c ) {
+ max = a;
+ min = SG_MIN2 (b, c);
+ } else {
+ max = c;
+ min = SG_MIN2 (a, b);
+ }
+ } else {
+ if( b > c ) {
+ max = b;
+ min = SG_MIN2 (a, c);
+ } else {
+ max = c;
+ min = SG_MIN2 (a, b);
+ }
+ }
+}
+
+// swap two values
template <class T>
inline void SG_SWAP( T &a, T &b) {
T c = a; a = b; b = c;
}
+// clamp a value to lie between min and max
+template <class T>
+inline void SG_CLAMP_RANGE(T &x, const T min, const T max ) {
+ if ( x < min ) { x = min; }
+ if ( x > max ) { x = max; }
+}
+
+// normalize a value to lie between min and max
+template <class T>
+inline void SG_NORMALIZE_RANGE( T &val, const T min, const T max ) {
+ T step = max - min;
+ while( val >= max ) val -= step;
+ while( val < min ) val += step;
+}
+
+// avoid an 'unused parameter' compiler warning.
+#define SG_UNUSED(x) (void)x
+
+// easy way to disable the copy constructor and assignment operator
+// on an object
+#define SG_DISABLE_COPY(Class) \
+ Class(const Class &); \
+ Class &operator=(const Class &);
+
#endif // _SG_INLINES_H