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101 lines
2.7 KiB
C
101 lines
2.7 KiB
C
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/*
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* Tiny Vector Matrix Library
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* Dense Vector Matrix Libary of Tiny size using Expression Templates
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*
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* Copyright (C) 2001 - 2003 Olaf Petzold <opetzold@users.sourceforge.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* $Id: Random.h,v 1.3 2004/09/16 09:14:18 opetzold Exp $
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*/
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#ifndef TVMET_UTIL_RANDOM_H
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#define TVMET_UTIL_RANDOM_H
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#include <tvmet/CompileTimeError.h>
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namespace tvmet {
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namespace util {
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/**
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* \class Random Random.h "tvmet/util/Random.h"
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* \brief A simple random class.
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* On each access this class returns a new random number using
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* std::rand(). The range generated is templated by MIN and
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* MAX.
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* \ingroup _util_function
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*
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* \par Example:
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* \code
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* #include <algorithm>
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*
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* tvmet::Random<int, 0, 100> random;
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*
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* std::generate(m1.begin(), m1.end(), random());
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* \endcode
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*/
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template<class T, int MIN=0, int MAX=100>
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class Random {
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static unsigned int s_seed;
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public:
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typedef T value_type;
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Random() { TVMET_CT_CONDITION(MIN<MAX, wrong_random_range) }
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value_type operator()() {
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s_seed += (unsigned)std::time(0);
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std::srand(s_seed);
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return MIN + int(double(MAX) * std::rand()/(double(RAND_MAX)+1.0));
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}
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};
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// instance
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template<class T, int MIN, int MAX>
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unsigned int Random<T, MIN, MAX>::s_seed;
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#if defined(TVMET_HAVE_COMPLEX)
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/**
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* \class Random< std::complex<T> > Random.h "tvmet/util/Random.h"
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* \brief Specialized Random class.
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* \ingroup _util_function
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*/
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template<class T, int MIN=0, int MAX=100>
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class Random {
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static unsigned int s_seed;
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public:
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typedef std::complex<T> value_type;
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Random() { TVMET_CT_CONDITION(MIN<MAX, wrong_random_range) }
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value_type operator()() {
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s_seed += (unsigned)std::time(0);
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std::srand(s_seed);
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return MIN + int(double(MAX) * std::rand()/(double(RAND_MAX)+1.0));
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}
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};
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// instance
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template<class T, int MIN, int MAX>
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unsigned int Random<std::complex<T>, MIN, MAX>::s_seed;
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#endif // defined(TVMET_HAVE_COMPLEX)
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} // namespace util
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} // namespace tvmet
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#endif // TVMET_UTIL_RANDOM_H
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// Local Variables:
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// mode:C++
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// End:
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