dc463d1c2c
Another toolkit I use has an explicit macro for this, which is nice for readability, so I've borrowed it here.
113 lines
2.9 KiB
C++
113 lines
2.9 KiB
C++
/**
|
|
* \file sg_inlines.h
|
|
* Various inline template definitions.
|
|
*/
|
|
|
|
// Written by Norman Vine, started June 2000.
|
|
//
|
|
// Copyright (C) 2000 Norman Vine - nhv@cape.com
|
|
//
|
|
// This library is free software; you can redistribute it and/or
|
|
// modify it under the terms of the GNU Library General Public
|
|
// License as published by the Free Software Foundation; either
|
|
// version 2 of the License, or (at your option) any later version.
|
|
//
|
|
// This library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// 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 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 int SG_SIGN(const T x) {
|
|
return x < T(0) ? -1 : 1;
|
|
}
|
|
|
|
// return the minimum of two values
|
|
template <class T>
|
|
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 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 T SG_MAX2(const T a, const T b) {
|
|
return a > b ? a : b;
|
|
}
|
|
|
|
// return the maximum of three values
|
|
template <class T>
|
|
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
|