random/detail/seed.hpp

0001 /* boost random/detail/seed.hpp header file
0002  *
0003  * Copyright Steven Watanabe 2009
0004  * Distributed under the Boost Software License, Version 1.0. (See
0005  * accompanying file LICENSE_1_0.txt or copy at
0006  * http://www.boost.org/LICENSE_1_0.txt)
0007  *
0008  * See http://www.boost.org for most recent version including documentation.
0009  *
0010  * $Id$
0011  */
0012
0013 #ifndef BOOST_RANDOM_DETAIL_SEED_HPP
0014 #define BOOST_RANDOM_DETAIL_SEED_HPP
0015
0016 #include <boost/config.hpp>
0017
0018 // Sun seems to have trouble with the use of SFINAE for the
0019 // templated constructor.  So does Borland.
0020 #if !defined(BOOST_NO_SFINAE) && !defined(__SUNPRO_CC) && !defined(BOOST_BORLANDC)
0021
0022 #include <boost/utility/enable_if.hpp>
0023 #include <boost/type_traits/is_arithmetic.hpp>
0024
0025 namespace boost {
0026 namespace random {
0027 namespace detail {
0028
0029 template<class T>
0030 struct disable_seed : boost::disable_if<boost::is_arithmetic<T> > {};
0031
0032 template<class Engine, class T>
0033 struct disable_constructor : disable_seed<T> {};
0034
0035 template<class Engine>
0036 struct disable_constructor<Engine, Engine> {};
0037
0038 #define BOOST_RANDOM_DETAIL_GENERATOR_CONSTRUCTOR(Self, Generator, gen) \
0039     template<class Generator>                                           \
0040     explicit Self(Generator& gen, typename ::boost::random::detail::disable_constructor<Self, Generator>::type* = 0)
0041
0042 #define BOOST_RANDOM_DETAIL_GENERATOR_SEED(Self, Generator, gen)    \
0043     template<class Generator>                                       \
0044     void seed(Generator& gen, typename ::boost::random::detail::disable_seed<Generator>::type* = 0)
0045
0046 #define BOOST_RANDOM_DETAIL_SEED_SEQ_CONSTRUCTOR(Self, SeedSeq, seq)    \
0047     template<class SeedSeq>                                             \
0048     explicit Self(SeedSeq& seq, typename ::boost::random::detail::disable_constructor<Self, SeedSeq>::type* = 0)
0049
0050 #define BOOST_RANDOM_DETAIL_SEED_SEQ_SEED(Self, SeedSeq, seq)   \
0051     template<class SeedSeq>                                     \
0052     void seed(SeedSeq& seq, typename ::boost::random::detail::disable_seed<SeedSeq>::type* = 0)
0053
0054 #define BOOST_RANDOM_DETAIL_ARITHMETIC_CONSTRUCTOR(Self, T, x)  \
0055     explicit Self(const T& x)
0056
0057 #define BOOST_RANDOM_DETAIL_ARITHMETIC_SEED(Self, T, x) \
0058     void seed(const T& x)
0059 }
0060 }
0061 }
0062
0063 #else
0064
0065 #include <boost/type_traits/is_arithmetic.hpp>
0066
0067 #define BOOST_RANDOM_DETAIL_GENERATOR_CONSTRUCTOR(Self, Generator, gen) \
0068     Self(Self& other) { *this = other; }                                \
0069     Self(const Self& other) { *this = other; }                          \
0070     template<class Generator>                                           \
0071     explicit Self(Generator& gen) {                                     \
0072         boost_random_constructor_impl(gen, ::boost::is_arithmetic<Generator>());\
0073     }                                                                   \
0074     template<class Generator>                                           \
0075     void boost_random_constructor_impl(Generator& gen, ::boost::false_type)
0076
0077 #define BOOST_RANDOM_DETAIL_GENERATOR_SEED(Self, Generator, gen)    \
0078     template<class Generator>                                       \
0079     void seed(Generator& gen) {                                     \
0080         boost_random_seed_impl(gen, ::boost::is_arithmetic<Generator>());\
0081     }\
0082     template<class Generator>\
0083     void boost_random_seed_impl(Generator& gen, ::boost::false_type)
0084
0085 #define BOOST_RANDOM_DETAIL_SEED_SEQ_CONSTRUCTOR(Self, SeedSeq, seq)    \
0086     Self(Self& other) { *this = other; }                                \
0087     Self(const Self& other) { *this = other; }                          \
0088     template<class SeedSeq>                                             \
0089     explicit Self(SeedSeq& seq) {                                       \
0090         boost_random_constructor_impl(seq, ::boost::is_arithmetic<SeedSeq>());\
0091     }                                                                   \
0092     template<class SeedSeq>                                             \
0093     void boost_random_constructor_impl(SeedSeq& seq, ::boost::false_type)
0094
0095 #define BOOST_RANDOM_DETAIL_SEED_SEQ_SEED(Self, SeedSeq, seq)           \
0096     template<class SeedSeq>                                             \
0097     void seed(SeedSeq& seq) {                                           \
0098         boost_random_seed_impl(seq, ::boost::is_arithmetic<SeedSeq>()); \
0099     }                                                                   \
0100     template<class SeedSeq>                                             \
0101     void boost_random_seed_impl(SeedSeq& seq, ::boost::false_type)
0102
0103 #define BOOST_RANDOM_DETAIL_ARITHMETIC_CONSTRUCTOR(Self, T, x)  \
0104     explicit Self(const T& x) { boost_random_constructor_impl(x, ::boost::true_type()); }\
0105     void boost_random_constructor_impl(const T& x, ::boost::true_type)
0106
0107 #define BOOST_RANDOM_DETAIL_ARITHMETIC_SEED(Self, T, x) \
0108     void seed(const T& x) { boost_random_seed_impl(x, ::boost::true_type()); }\
0109     void boost_random_seed_impl(const T& x, ::boost::true_type)
0110
0111 #endif
0112
0113 #endif