/usr/include/simgear/sg_inlines.h is in libsimgear-dev 1:2018.1.1+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 | /**
* \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.
//
// $Id$
#include <type_traits>
#include <utility>
#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 &);
namespace simgear {
// A swap() that is guaranteed to be 'noexcept' as long as compilation
// succeeds. Idea and implementation from
// <https://akrzemi1.wordpress.com/2011/06/10/using-noexcept/>.
template<typename T>
void noexceptSwap(T& a, T& b) noexcept
{
using std::swap;
static_assert(noexcept(swap(a, b)), "this swap() is not 'noexcept'" );
swap(a, b);
}
// Cast an enum value to its underlying type (useful with scoped enumerations).
//
// Example: enum class MyEnum { first = 1, second };
// auto e = MyEnum::second;
// std::string msg = "MyEnum::second is " +
// std::to_string(simgear::enumValue(e));
template <typename T>
constexpr typename std::underlying_type<T>::type enumValue(T e) {
return static_cast<typename std::underlying_type<T>::type>(e);
}
} // of namespace simgear
#endif // _SG_INLINES_H
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