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exponential_distribution.hpp - Hosted on DriveHQ Cloud IT Platform
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Ruta de la carpeta: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\random\exponential_distribution.hpp
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/* boost random/exponential_distribution.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: exponential_distribution.hpp 41369 2007-11-25 18:07:19Z bemandawes $ * * Revision history * 2001-02-18 moved to individual header files */ #ifndef BOOST_RANDOM_EXPONENTIAL_DISTRIBUTION_HPP #define BOOST_RANDOM_EXPONENTIAL_DISTRIBUTION_HPP #include
#include
#include
#include
#include
namespace boost { // exponential distribution: p(x) = lambda * exp(-lambda * x) template
class exponential_distribution { public: typedef RealType input_type; typedef RealType result_type; #if !defined(BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS) && !(defined(BOOST_MSVC) && BOOST_MSVC <= 1300) BOOST_STATIC_ASSERT(!std::numeric_limits
::is_integer); #endif explicit exponential_distribution(result_type lambda_arg = result_type(1)) : _lambda(lambda_arg) { assert(_lambda > result_type(0)); } // compiler-generated copy ctor and assignment operator are fine result_type lambda() const { return _lambda; } void reset() { } template
result_type operator()(Engine& eng) { #ifndef BOOST_NO_STDC_NAMESPACE using std::log; #endif return -result_type(1) / _lambda * log(result_type(1)-eng()); } #if !defined(BOOST_NO_OPERATORS_IN_NAMESPACE) && !defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS) template
friend std::basic_ostream
& operator<<(std::basic_ostream
& os, const exponential_distribution& ed) { os << ed._lambda; return os; } template
friend std::basic_istream
& operator>>(std::basic_istream
& is, exponential_distribution& ed) { is >> std::ws >> ed._lambda; return is; } #endif private: result_type _lambda; }; } // namespace boost #endif // BOOST_RANDOM_EXPONENTIAL_DISTRIBUTION_HPP
exponential_distribution.hpp
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