64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
/*
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* This file is part of libgim.
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*
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* libgim is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* libgim is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with libgim. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2010 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_RANDOM_HPP
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#define __UTIL_RANDOM_HPP
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#include <iterator>
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namespace util {
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template <typename T>
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T& randomise (T &);
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template <typename T, size_t N>
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T* randomise (T(&)[N]);
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template <typename T>
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T random (void);
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template <typename T>
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typename T::value_type&
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choose (T &container) {
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typename T::iterator cursor = container.begin ();
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typename T::size_type size = container.size ();
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typename T::size_type offset = random<typename T::size_type> () % size;
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std::advance (cursor, offset);
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return *cursor;
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}
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template <typename T, size_t N>
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T&
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choose (T (&v)[N]) {
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return v[static_cast<size_t> (random<float> () * N)];
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}
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template <typename T>
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typename T::value_type&
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choose (T begin, T end) {
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typename T::difference_type size = std::distance (begin, end);
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std::advance (begin, random<T::size_type> () % size);
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return *begin;
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}
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}
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#include "random.ipp"
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#endif
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