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/*
* Copyright 2008-2013 NVIDIA Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <thrust/detail/config.h>
#include <thrust/system/detail/generic/sequence.h>
#include <thrust/iterator/iterator_traits.h>
#include <thrust/tabulate.h>
THRUST_NAMESPACE_BEGIN
namespace system
{
namespace detail
{
namespace generic
{
template<typename DerivedPolicy, typename ForwardIterator>
__host__ __device__
void sequence(thrust::execution_policy<DerivedPolicy> &exec,
ForwardIterator first,
ForwardIterator last)
{
typedef typename thrust::iterator_traits<ForwardIterator>::value_type T;
thrust::sequence(exec, first, last, T(0));
} // end sequence()
template<typename DerivedPolicy, typename ForwardIterator, typename T>
__host__ __device__
void sequence(thrust::execution_policy<DerivedPolicy> &exec,
ForwardIterator first,
ForwardIterator last,
T init)
{
thrust::sequence(exec, first, last, init, T(1));
} // end sequence()
namespace detail
{
template <typename T, typename = void>
struct compute_sequence_value
{
T init;
T step;
__thrust_exec_check_disable__
__host__ __device__
T operator()(std::size_t i) const
{
return init + step * i;
}
};
template <typename T>
struct compute_sequence_value<T, typename std::enable_if<std::is_arithmetic<T>::value>::type>
{
T init;
T step;
__thrust_exec_check_disable__
__host__ __device__
T operator()(std::size_t i) const
{
return init + step * static_cast<T>(i);
}
};
}
template<typename DerivedPolicy, typename ForwardIterator, typename T>
__host__ __device__
void sequence(thrust::execution_policy<DerivedPolicy> &exec,
ForwardIterator first,
ForwardIterator last,
T init,
T step)
{
thrust::tabulate(exec,
first,
last,
detail::compute_sequence_value<T>{std::move(init),
std::move(step)});
} // end sequence()
} // end namespace generic
} // end namespace detail
} // end namespace system
THRUST_NAMESPACE_END
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