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//---------------------------------------------------------------------------//
// Copyright (c) 2013-2014 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.
//---------------------------------------------------------------------------//
#define BOOST_TEST_MODULE TestUniformRealDistribution
#include <boost/test/unit_test.hpp>
#include <boost/compute/system.hpp>
#include <boost/compute/command_queue.hpp>
#include <boost/compute/algorithm/count_if.hpp>
#include <boost/compute/algorithm/transform.hpp>
#include <boost/compute/function.hpp>
#include <boost/compute/container/vector.hpp>
#include <boost/compute/random/default_random_engine.hpp>
#include <boost/compute/random/uniform_real_distribution.hpp>
#include <boost/compute/lambda.hpp>
#include <boost/compute/types/fundamental.hpp>
#include "context_setup.hpp"
BOOST_AUTO_TEST_CASE(uniform_real_distribution_doctest)
{
using boost::compute::lambda::_1;
boost::compute::vector<float> vec(128, context);
//! [generate]
// initialize the default random engine
boost::compute::default_random_engine engine(queue);
// setup the uniform distribution to produce floats between 1 and 100
boost::compute::uniform_real_distribution<float> distribution(1.0f, 100.0f);
// generate the random values and store them to 'vec'
distribution.generate(vec.begin(), vec.end(), engine, queue);
//! [generate]
BOOST_CHECK_EQUAL(
boost::compute::count_if(
vec.begin(), vec.end(), _1 < 1.0f || _1 >= 100.0f, queue
),
size_t(0)
);
}
template<class T>
class range_test_engine
{
public:
explicit range_test_engine(boost::compute::command_queue &queue) {
(void) queue;
}
template<class OutputIterator, class Function>
void generate(OutputIterator first, OutputIterator last, Function op, boost::compute::command_queue &queue)
{
boost::compute::vector<T> tmp(std::distance(first, last), queue.get_context());
BOOST_COMPUTE_FUNCTION(T, max_random, (const T x),
{
if(get_global_id(0) < 1)
return (ValueType) MAX_RANDOM;
else
return (ValueType) 0;
});
max_random.define("MAX_RANDOM", "UINT_MAX");
max_random.define("ValueType", boost::compute::type_name<T>());
boost::compute::transform(tmp.begin(), tmp.end(), tmp.begin(), max_random, queue);
boost::compute::transform(tmp.begin(), tmp.end(), first, op, queue);
}
};
// For checking if result is in the correct range [low, hi)
BOOST_AUTO_TEST_CASE(uniform_real_distribution_range)
{
using boost::compute::lambda::_1;
boost::compute::vector<float> vec(32, context);
// initialize the range_test_engine
range_test_engine<boost::compute::uint_> engine(queue);
// setup the uniform distribution to produce floats between 0.9 and 1.0
boost::compute::uniform_real_distribution<float> distribution(0.9f, 1.0f);
// generate the random values and store them to 'vec'
distribution.generate(vec.begin(), vec.end(), engine, queue);
BOOST_CHECK_EQUAL(
boost::compute::count_if(
vec.begin(), vec.end(), _1 < 0.9f || _1 >= 1.0f, queue
),
size_t(0)
);
}
BOOST_AUTO_TEST_SUITE_END()
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