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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/generate.h>
#include <thrust/iterator/iterator_traits.h>
#include <thrust/detail/internal_functional.h>
#include <thrust/for_each.h>
THRUST_NAMESPACE_BEGIN
namespace system
{
namespace detail
{
namespace generic
{
template<typename ExecutionPolicy,
typename ForwardIterator,
typename Generator>
__host__ __device__
void generate(thrust::execution_policy<ExecutionPolicy> &exec,
ForwardIterator first,
ForwardIterator last,
Generator gen)
{
// this static assert is necessary due to a workaround in generate_functor
// it takes a const reference to accept temporaries from proxy iterators
// and then const_casts the constness away
//
// this had the weird side effect of allowing generate (and fill, and whatever
// else is implemented in terms of generate) to fill through const iterators.
// this might become unnecessary once Thrust is C++11-and-above only, since the
// other solution is to take an rvalue reference in a second overload of
// operator() of the function object, but until we support pre-11, this is a
// nice solution that validates the const_cast and doesn't take away any
// functionality.
THRUST_STATIC_ASSERT_MSG(
!thrust::detail::is_const<
typename thrust::detail::remove_reference<
typename thrust::iterator_traits<ForwardIterator>::reference
>::type
>::value
, "generating to `const` iterators is not allowed"
);
thrust::for_each(exec, first, last, typename thrust::detail::generate_functor<ExecutionPolicy,Generator>::type(gen));
} // end generate()
template<typename ExecutionPolicy,
typename OutputIterator,
typename Size,
typename Generator>
__host__ __device__
OutputIterator generate_n(thrust::execution_policy<ExecutionPolicy> &exec,
OutputIterator first,
Size n,
Generator gen)
{
// this static assert is necessary due to a workaround in generate_functor
// it takes a const reference to accept temporaries from proxy iterators
// and then const_casts the constness away
//
// this had the weird side effect of allowing generate (and fill, and whatever
// else is implemented in terms of generate) to fill through const iterators.
// this might become unnecessary once Thrust is C++11-and-above only, since the
// other solution is to take an rvalue reference in a second overload of
// operator() of the function object, but until we support pre-11, this is a
// nice solution that validates the const_cast and doesn't take away any
// functionality.
THRUST_STATIC_ASSERT_MSG(
!thrust::detail::is_const<
typename thrust::detail::remove_reference<
typename thrust::iterator_traits<OutputIterator>::reference
>::type
>::value
, "generating to `const` iterators is not allowed"
);
return thrust::for_each_n(exec, first, n, typename thrust::detail::generate_functor<ExecutionPolicy,Generator>::type(gen));
} // end generate()
} // end namespace generic
} // end namespace detail
} // end namespace system
THRUST_NAMESPACE_END
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