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| author | Remko Tronçon <git@el-tramo.be> | 2012-04-23 13:32:24 (GMT) |
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| committer | Remko Tronçon <git@el-tramo.be> | 2012-04-23 13:57:24 (GMT) |
| commit | 18f4f0ba13bbfe901dae44e95d869ba0425e93c7 (patch) | |
| tree | 51de477a7f2dc9aba3177e6ea50ed90dbff91f85 /3rdParty/Boost/src | |
| parent | 2f64443e7a3e427a3a38665b5aafb77c9b128cc0 (diff) | |
| download | swift-18f4f0ba13bbfe901dae44e95d869ba0425e93c7.zip swift-18f4f0ba13bbfe901dae44e95d869ba0425e93c7.tar.bz2 | |
Select SRV randomly, taking weight into account.
Resolves: #1030
Diffstat (limited to '3rdParty/Boost/src')
| -rw-r--r-- | 3rdParty/Boost/src/boost/random/uniform_real.hpp | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/random/uniform_real.hpp b/3rdParty/Boost/src/boost/random/uniform_real.hpp new file mode 100644 index 0000000..06bfbc3 --- /dev/null +++ b/3rdParty/Boost/src/boost/random/uniform_real.hpp @@ -0,0 +1,108 @@ +/* boost random/uniform_real.hpp header file + * + * Copyright Jens Maurer 2000-2001 + * Distributed under the Boost Software License, Version 1.0. (See + * accompanying file LICENSE_1_0.txt or copy at + * http://www.boost.org/LICENSE_1_0.txt) + * + * See http://www.boost.org for most recent version including documentation. + * + * $Id: uniform_real.hpp 60755 2010-03-22 00:45:06Z steven_watanabe $ + * + * Revision history + * 2001-04-08 added min<max assertion (N. Becker) + * 2001-02-18 moved to individual header files + */ + +#ifndef BOOST_RANDOM_UNIFORM_REAL_HPP +#define BOOST_RANDOM_UNIFORM_REAL_HPP + +#include <cassert> +#include <iostream> +#include <boost/config.hpp> +#include <boost/limits.hpp> +#include <boost/static_assert.hpp> +#include <boost/random/detail/config.hpp> + +namespace boost { + +/** + * The distribution function uniform_real models a random distribution. + * On each invocation, it returns a random floating-point value uniformly + * distributed in the range [min..max). The value is computed using + * std::numeric_limits<RealType>::digits random binary digits, i.e. + * the mantissa of the floating-point value is completely filled with + * random bits. + * + * Note: The current implementation is buggy, because it may not fill + * all of the mantissa with random bits. + */ +template<class RealType = double> +class uniform_real +{ +public: + typedef RealType input_type; + typedef RealType result_type; + + /** + * Constructs a uniform_real object. @c min and @c max are the + * parameters of the distribution. + * + * Requires: min <= max + */ + explicit uniform_real(RealType min_arg = RealType(0), + RealType max_arg = RealType(1)) + : _min(min_arg), _max(max_arg) + { +#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS + BOOST_STATIC_ASSERT(!std::numeric_limits<RealType>::is_integer); +#endif + assert(min_arg <= max_arg); + } + + // compiler-generated copy ctor and assignment operator are fine + + /** + * Returns: The "min" parameter of the distribution + */ + result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return _min; } + /** + * Returns: The "max" parameter of the distribution + */ + result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return _max; } + void reset() { } + + template<class Engine> + result_type operator()(Engine& eng) { + result_type numerator = static_cast<result_type>(eng() - eng.min BOOST_PREVENT_MACRO_SUBSTITUTION()); + result_type divisor = static_cast<result_type>(eng.max BOOST_PREVENT_MACRO_SUBSTITUTION() - eng.min BOOST_PREVENT_MACRO_SUBSTITUTION()); + assert(divisor > 0); + assert(numerator >= 0 && numerator <= divisor); + return numerator / divisor * (_max - _min) + _min; + } + +#ifndef BOOST_RANDOM_NO_STREAM_OPERATORS + template<class CharT, class Traits> + friend std::basic_ostream<CharT,Traits>& + operator<<(std::basic_ostream<CharT,Traits>& os, const uniform_real& ud) + { + os << ud._min << " " << ud._max; + return os; + } + + template<class CharT, class Traits> + friend std::basic_istream<CharT,Traits>& + operator>>(std::basic_istream<CharT,Traits>& is, uniform_real& ud) + { + is >> std::ws >> ud._min >> std::ws >> ud._max; + return is; + } +#endif + +private: + RealType _min, _max; +}; + +} // namespace boost + +#endif // BOOST_RANDOM_UNIFORM_REAL_HPP |