boost/random/detail/seed.hpp

   1 /* boost random/detail/seed.hpp header file
   2  *
   3  * Copyright Steven Watanabe 2009
   4  * Distributed under the Boost Software License, Version 1.0. (See
   5  * accompanying file LICENSE_1_0.txt or copy at
   6  * http://www.boost.org/LICENSE_1_0.txt)
   7  *
   8  * See http://www.boost.org for most recent version including documentation.
   9  *
  10  * $Id: seed.hpp 60755 2010-03-22 00:45:06Z steven_watanabe $
  11  */
  12
  13 #ifndef BOOST_RANDOM_DETAIL_SEED_HPP
  14 #define BOOST_RANDOM_DETAIL_SEED_HPP
  15
  16 #include <boost/config.hpp>
  17
  18 // Sun seems to have trouble with the use of SFINAE for the
  19 // templated constructor.  So does Borland.
  20 #if !defined(BOOST_NO_SFINAE) && !defined(__SUNPRO_CC) && !defined(__BORLANDC__)
  21
  22 #include <boost/utility/enable_if.hpp>
  23 #include <boost/type_traits/is_arithmetic.hpp>
  24
  25 namespace boost {
  26 namespace random {
  27 namespace detail {
  28
  29 template<class T>
  30 struct disable_seed : boost::disable_if<boost::is_arithmetic<T> > {};
  31
  32 template<class Engine, class T>
  33 struct disable_constructor : disable_seed<T> {};
  34
  35 template<class Engine>
  36 struct disable_constructor<Engine, Engine> {};
  37
  38 #define BOOST_RANDOM_DETAIL_GENERATOR_CONSTRUCTOR(Self, Generator, gen) \
  39     template<class Generator>                                           \
  40     explicit Self(Generator& gen, typename ::boost::random::detail::disable_constructor<Self, Generator>::type* = 0)
  41
  42 #define BOOST_RANDOM_DETAIL_GENERATOR_SEED(Self, Generator, gen)    \
  43     template<class Generator>                                       \
  44     void seed(Generator& gen, typename ::boost::random::detail::disable_seed<Generator>::type* = 0)
  45
  46 #define BOOST_RANDOM_DETAIL_ARITHMETIC_CONSTRUCTOR(Self, T, x)  \
  47     explicit Self(const T& x)
  48
  49 #define BOOST_RANDOM_DETAIL_ARITHMETIC_SEED(Self, T, x) \
  50     void seed(const T& x)
  51
  52 }
  53 }
  54 }
  55
  56 #else
  57
  58 #include <boost/type_traits/is_arithmetic.hpp>
  59 #include <boost/mpl/bool.hpp>
  60
  61 #define BOOST_RANDOM_DETAIL_GENERATOR_CONSTRUCTOR(Self, Generator, gen) \
  62     Self(Self& other) { *this = other; }                                \
  63     Self(const Self& other) { *this = other; }                          \
  64     template<class Generator>                                           \
  65     explicit Self(Generator& gen) {                                     \
  66         boost_random_constructor_impl(gen, ::boost::is_arithmetic<Generator>());\
  67     }                                                                   \
  68     template<class Generator>                                           \
  69     void boost_random_constructor_impl(Generator& gen, ::boost::mpl::false_)
  70
  71 #define BOOST_RANDOM_DETAIL_GENERATOR_SEED(Self, Generator, gen)    \
  72     template<class Generator>                                       \
  73     void seed(Generator& gen) {                                     \
  74         boost_random_seed_impl(gen, ::boost::is_arithmetic<Generator>());\
  75     }\
  76     template<class Generator>\
  77     void boost_random_seed_impl(Generator& gen, ::boost::mpl::false_)
  78
  79 #define BOOST_RANDOM_DETAIL_ARITHMETIC_CONSTRUCTOR(Self, T, x)  \
  80     explicit Self(const T& x) { boost_random_constructor_impl(x, ::boost::mpl::true_()); }\
  81     void boost_random_constructor_impl(const T& x, ::boost::mpl::true_)
  82
  83 #define BOOST_RANDOM_DETAIL_ARITHMETIC_SEED(Self, T, x) \
  84     void seed(const T& x) { boost_random_seed_impl(x, ::boost::mpl::true_()); }\
  85     void boost_random_seed_impl(const T& x, ::boost::mpl::true_)
  86
  87 #endif
  88
  89 #endif