| 1 | /* boost random/uniform_real.hpp header file |
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| 2 | * |
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| 3 | * Copyright Jens Maurer 2000-2001 |
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| 4 | * Distributed under the Boost Software License, Version 1.0. (See |
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| 5 | * accompanying file LICENSE_1_0.txt or copy at |
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| 6 | * http://www.boost.org/LICENSE_1_0.txt) |
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| 7 | * |
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| 8 | * See http://www.boost.org for most recent version including documentation. |
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| 9 | * |
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| 10 | * $Id: uniform_real.hpp,v 1.17 2005/01/28 15:04:17 dgregor Exp $ |
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| 11 | * |
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| 12 | * Revision history |
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| 13 | * 2001-04-08 added min<max assertion (N. Becker) |
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| 14 | * 2001-02-18 moved to individual header files |
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| 15 | */ |
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| 16 | |
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| 17 | #ifndef BOOST_RANDOM_UNIFORM_REAL_HPP |
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| 18 | #define BOOST_RANDOM_UNIFORM_REAL_HPP |
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| 19 | |
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| 20 | #include <cassert> |
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| 21 | #include <iostream> |
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| 22 | #include <boost/config.hpp> |
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| 23 | #include <boost/limits.hpp> |
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| 24 | #include <boost/static_assert.hpp> |
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| 25 | |
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| 26 | namespace boost { |
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| 27 | |
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| 28 | // uniform distribution on a real range |
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| 29 | template<class RealType = double> |
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| 30 | class uniform_real |
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| 31 | { |
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| 32 | public: |
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| 33 | typedef RealType input_type; |
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| 34 | typedef RealType result_type; |
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| 35 | |
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| 36 | explicit uniform_real(RealType min = RealType(0), |
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| 37 | RealType max = RealType(1)) |
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| 38 | : _min(min), _max(max) |
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| 39 | { |
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| 40 | #ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS |
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| 41 | BOOST_STATIC_ASSERT(!std::numeric_limits<RealType>::is_integer); |
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| 42 | #endif |
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| 43 | assert(min < max); |
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| 44 | } |
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| 45 | |
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| 46 | // compiler-generated copy ctor and assignment operator are fine |
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| 47 | |
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| 48 | result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return _min; } |
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| 49 | result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return _max; } |
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| 50 | void reset() { } |
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| 51 | |
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| 52 | template<class Engine> |
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| 53 | result_type operator()(Engine& eng) { |
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| 54 | return static_cast<result_type>(eng() - eng.min BOOST_PREVENT_MACRO_SUBSTITUTION()) |
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| 55 | / static_cast<result_type>(eng.max BOOST_PREVENT_MACRO_SUBSTITUTION() - eng.min BOOST_PREVENT_MACRO_SUBSTITUTION()) |
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| 56 | * (_max - _min) + _min; |
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| 57 | } |
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| 58 | |
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| 59 | #if !defined(BOOST_NO_OPERATORS_IN_NAMESPACE) && !defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS) |
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| 60 | template<class CharT, class Traits> |
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| 61 | friend std::basic_ostream<CharT,Traits>& |
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| 62 | operator<<(std::basic_ostream<CharT,Traits>& os, const uniform_real& ud) |
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| 63 | { |
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| 64 | os << ud._min << " " << ud._max; |
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| 65 | return os; |
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| 66 | } |
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| 67 | |
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| 68 | template<class CharT, class Traits> |
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| 69 | friend std::basic_istream<CharT,Traits>& |
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| 70 | operator>>(std::basic_istream<CharT,Traits>& is, uniform_real& ud) |
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| 71 | { |
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| 72 | is >> std::ws >> ud._min >> std::ws >> ud._max; |
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| 73 | return is; |
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| 74 | } |
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| 75 | #endif |
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| 76 | |
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| 77 | private: |
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| 78 | RealType _min, _max; |
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| 79 | }; |
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| 80 | |
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| 81 | } // namespace boost |
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| 82 | |
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| 83 | #endif // BOOST_RANDOM_UNIFORM_REAL_HPP |
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