/usr/include/ETL/_curve_func.h is in etl-dev 0.04.19-1.
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 | /*! ========================================================================
** Extended Template and Library
** Utility Curve Template Class Implementations
** $Id$
**
** Copyright (c) 2002 Robert B. Quattlebaum Jr.
**
** This package is free software; you can redistribute it and/or
** modify it under the terms of the GNU General Public License as
** published by the Free Software Foundation; either version 2 of
** the License, or (at your option) any later version.
**
** This package 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
** General Public License for more details.
**
** === N O T E S ===========================================================
**
** This is an internal header file, included by other ETL headers.
** You should not attempt to use it directly.
**
** ========================================================================= */
/* === S T A R T =========================================================== */
#ifndef __ETL__CURVE_FUNC_H
#define __ETL__CURVE_FUNC_H
/* === H E A D E R S ======================================================= */
#include <functional>
#include "_fixed.h"
/* -- C L A S S E S --------------------------------------------------------- */
template <class T, class K=float>
struct affine_combo
{
// from (a) to (x) : x = a(1-t) + b(t)
T operator()(const T &a,const T &b,const K &t)const
{
return T( (b-a)*t+a );
}
// from (x) to (a) : a = (x-b(t)) / (1-t)
T reverse(const T &x, const T &b, const K &t)const
{
return T( (x-t*b)*(static_cast<K>(1)/(static_cast<K>(1)-t)) );
}
};
template <class T, class K=float>
struct distance_func : public std::binary_function<T, T, K>
{
K operator()(const T &a,const T &b)const
{
T delta=b-a;
return static_cast<K>(delta*delta);
}
K cook(const K &x)const { return x*x; }
K uncook(const K &x)const { return sqrt(x); }
};
/* -- E N D ----------------------------------------------------------------- */
#endif
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