[857] | 1 | /* boost random/detail/uniform_int_float.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: pass_through_engine.hpp,v 1.5 2004/07/27 03:43:32 dgregor Exp $
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| 11 | *
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| 12 | */
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| 13 |
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| 14 | #ifndef BOOST_RANDOM_DETAIL_PASS_THROUGH_ENGINE_HPP
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| 15 | #define BOOST_RANDOM_DETAIL_PASS_THROUGH_ENGINE_HPP
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| 16 |
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| 17 | #include <boost/config.hpp>
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| 18 | #include <boost/random/detail/ptr_helper.hpp>
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| 19 |
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| 20 |
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| 21 | namespace boost {
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| 22 | namespace random {
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| 23 | namespace detail {
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| 24 |
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| 25 | template<class UniformRandomNumberGenerator>
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| 26 | class pass_through_engine
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| 27 | {
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| 28 | private:
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| 29 | typedef ptr_helper<UniformRandomNumberGenerator> helper_type;
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| 30 |
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| 31 | public:
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| 32 | typedef typename helper_type::value_type base_type;
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| 33 | typedef typename base_type::result_type result_type;
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| 34 |
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| 35 | explicit pass_through_engine(UniformRandomNumberGenerator rng)
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| 36 | // make argument an rvalue to avoid matching Generator& constructor
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| 37 | : _rng(static_cast<typename helper_type::rvalue_type>(rng))
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| 38 | { }
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| 39 |
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| 40 | result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return (base().min)(); }
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| 41 | result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return (base().max)(); }
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| 42 | base_type& base() { return helper_type::ref(_rng); }
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| 43 | const base_type& base() const { return helper_type::ref(_rng); }
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| 44 |
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| 45 | result_type operator()() { return base()(); }
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| 46 |
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| 47 | private:
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| 48 | UniformRandomNumberGenerator _rng;
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| 49 | };
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| 50 |
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| 51 | #ifndef BOOST_NO_STD_LOCALE
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| 52 |
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| 53 | template<class UniformRandomNumberGenerator, class CharT, class Traits>
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| 54 | std::basic_ostream<CharT,Traits>&
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| 55 | operator<<(
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| 56 | std::basic_ostream<CharT,Traits>& os
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| 57 | , const pass_through_engine<UniformRandomNumberGenerator>& ud
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| 58 | )
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| 59 | {
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| 60 | return os << ud.base();
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| 61 | }
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| 62 |
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| 63 | template<class UniformRandomNumberGenerator, class CharT, class Traits>
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| 64 | std::basic_istream<CharT,Traits>&
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| 65 | operator>>(
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| 66 | std::basic_istream<CharT,Traits>& is
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| 67 | , const pass_through_engine<UniformRandomNumberGenerator>& ud
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| 68 | )
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| 69 | {
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| 70 | return is >> ud.base();
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| 71 | }
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| 72 |
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| 73 | #else // no new streams
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| 74 |
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| 75 | template<class UniformRandomNumberGenerator>
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| 76 | inline std::ostream&
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| 77 | operator<<(std::ostream& os,
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| 78 | const pass_through_engine<UniformRandomNumberGenerator>& ud)
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| 79 | {
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| 80 | return os << ud.base();
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| 81 | }
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| 82 |
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| 83 | template<class UniformRandomNumberGenerator>
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| 84 | inline std::istream&
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| 85 | operator>>(std::istream& is,
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| 86 | const pass_through_engine<UniformRandomNumberGenerator>& ud)
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| 87 | {
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| 88 | return is >> ud.base();
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| 89 | }
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| 90 |
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| 91 | #endif
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| 92 |
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| 93 | } // namespace detail
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| 94 | } // namespace random
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| 95 | } // namespace boost
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| 96 |
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| 97 | #endif // BOOST_RANDOM_DETAIL_PASS_THROUGH_ENGINE_HPP
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| 98 |
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