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/**
* \file
* \brief Various utility functions.
*//*
* Copyright 2007 Johan Engelen <goejendaagh@zonnet.nl>
* Copyright 2006 Michael G. Sloan <mgsloan@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; 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 MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
*/
#ifndef SEEN_LIB2GEOM_UTILS_H
#define SEEN_LIB2GEOM_UTILS_H
#include <cstddef>
#include <vector>
namespace Geom {
// proper logical xor
inline bool logical_xor (bool a, bool b) { return (a || b) && !(a && b); }
void binomial_coefficients(std::vector<size_t>& bc, size_t n);
struct EmptyClass {};
/**
* @brief Noncommutative multiplication helper.
* Generates operator*(T, U) from operator*=(T, U). Does not generate operator*(U, T)
* like boost::multipliable does. This makes it suitable for noncommutative cases,
* such as transforms.
*/
template <class T, class U, class B = EmptyClass>
struct MultipliableNoncommutative : B
{
friend T operator*(T const &lhs, U const &rhs) {
T nrv(lhs); nrv *= rhs; return nrv;
}
};
} // end namespace Geom
#endif // SEEN_LIB2GEOM_UTILS_H
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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