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- //---------------------------------------------------------------------------//
- // Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
- //
- // 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://boostorg.github.com/compute for more information.
- //---------------------------------------------------------------------------//
- #ifndef BOOST_COMPUTE_RANDOM_UNIFORM_REAL_DISTRIBUTION_HPP
- #define BOOST_COMPUTE_RANDOM_UNIFORM_REAL_DISTRIBUTION_HPP
- #include <boost/assert.hpp>
- #include <boost/type_traits.hpp>
- #include <boost/compute/command_queue.hpp>
- #include <boost/compute/function.hpp>
- #include <boost/compute/detail/literal.hpp>
- #include <boost/compute/types/fundamental.hpp>
- namespace boost {
- namespace compute {
- /// \class uniform_real_distribution
- /// \brief Produces uniformly distributed random floating-point numbers.
- ///
- /// The following example shows how to setup a uniform real distribution to
- /// produce random \c float values between \c 1 and \c 100.
- ///
- /// \snippet test/test_uniform_real_distribution.cpp generate
- ///
- /// \see default_random_engine, normal_distribution
- template<class RealType = float>
- class uniform_real_distribution
- {
- public:
- typedef RealType result_type;
- /// Creates a new uniform distribution producing numbers in the range
- /// [\p a, \p b).
- /// Requires a < b
- uniform_real_distribution(RealType a = 0.f, RealType b = 1.f)
- : m_a(a),
- m_b(b)
- {
- BOOST_ASSERT(a < b);
- }
- /// Destroys the uniform_real_distribution object.
- ~uniform_real_distribution()
- {
- }
- /// Returns the minimum value of the distribution.
- result_type a() const
- {
- return m_a;
- }
- /// Returns the maximum value of the distribution.
- result_type b() const
- {
- return m_b;
- }
- /// Generates uniformly distributed floating-point numbers and stores
- /// them to the range [\p first, \p last).
- template<class OutputIterator, class Generator>
- void generate(OutputIterator first,
- OutputIterator last,
- Generator &generator,
- command_queue &queue)
- {
- BOOST_COMPUTE_FUNCTION(RealType, scale_random, (const uint_ x),
- {
- return nextafter(LO + (convert_RealType(x) / MAX_RANDOM) * (HI - LO), (RealType) LO);
- });
- scale_random.define("LO", detail::make_literal(m_a));
- scale_random.define("HI", detail::make_literal(m_b));
- scale_random.define("MAX_RANDOM", "UINT_MAX");
- scale_random.define(
- "convert_RealType", std::string("convert_") + type_name<RealType>()
- );
- scale_random.define("RealType", type_name<RealType>());
- generator.generate(
- first, last, scale_random, queue
- );
- }
- /// \internal_ (deprecated)
- template<class OutputIterator, class Generator>
- void fill(OutputIterator first,
- OutputIterator last,
- Generator &g,
- command_queue &queue)
- {
- generate(first, last, g, queue);
- }
- private:
- RealType m_a;
- RealType m_b;
- BOOST_STATIC_ASSERT_MSG(
- boost::is_floating_point<RealType>::value,
- "Template argument must be a floating point type"
- );
- };
- } // end compute namespace
- } // end boost namespace
- #endif // BOOST_COMPUTE_RANDOM_UNIFORM_REAL_DISTRIBUTION_HPP
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