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/*
* Copyright 2008-2012 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.
*/


/*! \file uninitialized_copy.h
* \brief Copy construction into a range of uninitialized elements from a source range
*/

#pragma once

#include <thrust/detail/config.h>
#include <thrust/detail/dispatchable.h>

namespace thrust
{


template<typename System, typename InputIterator, typename ForwardIterator>
  ForwardIterator uninitialized_copy(thrust::detail::dispatchable_base<System> &system,
                                     InputIterator first,
                                     InputIterator last,
                                     ForwardIterator result);


template<typename System, typename InputIterator, typename Size, typename ForwardIterator>
  ForwardIterator uninitialized_copy_n(thrust::detail::dispatchable_base<System> &system,
                                       InputIterator first,
                                       Size n,
                                       ForwardIterator result);


/*! \addtogroup copying
* \{
*/

/*! In \c thrust, the function \c thrust::device_new allocates memory for
* an object and then creates an object at that location by calling a constructor.
* Occasionally, however, it is useful to separate those two operations.
* If each iterator in the range <tt>[result, result + (last - first))</tt> points
* to uninitialized memory, then \p uninitialized_copy creates a copy of
* <tt>[first, last)</tt> in that range. That is, for each iterator \c i in
* the input, \p uninitialized_copy creates a copy of \c *i in the location pointed
* to by the corresponding iterator in the output range by \p ForwardIterator's
* \c value_type's copy constructor with *i as its argument.
*
* \param first The first element of the input range to copy from.
* \param last The last element of the input range to copy from.
* \param result The first element of the output range to copy to.
* \return An iterator pointing to the last element of the output range.
*
* \tparam InputIterator is a model of <a href="http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>.
* \tparam ForwardIterator is a model of <a href="http://www.sgi.com/tech/stl/ForwardIterator.html">Forward Iterator</a>,
* \p ForwardIterator is mutable, and \p ForwardIterator's \c value_type has a constructor that takes
* a single argument whose type is \p InputIterator's \c value_type.
*
* The following code snippet demonstrates how to use \p uninitialized_copy to initialize
* a range of uninitialized memory.
*
* \code
* #include <thrust/uninitialized_copy.h>
* #include <thrust/device_malloc.h>
* #include <thrust/device_vector.h>
* ...
* struct Int
* {
* __host__ __device__
* Int(int x) : val(x) {}
* int val;
* };
* ...
* const int N = 137;
*
* Int val(46);
* thrust::device_vector<Int> input(N, val);
* thrust::device_ptr<Int> array = thrust::device_malloc<Int>(N);
* thrust::uninitialized_copy(input.begin(), input.end(), array);
*
* // Int x = array[i];
* // x.val == 46 for all 0 <= i < N
* \endcode
*
* \see http://www.sgi.com/tech/stl/uninitialized_copy.html
* \see \c copy
* \see \c uninitialized_fill
* \see \c device_new
* \see \c device_malloc
*/
template<typename InputIterator, typename ForwardIterator>
  ForwardIterator uninitialized_copy(InputIterator first,
                                     InputIterator last,
                                     ForwardIterator result);

/*! In \c thrust, the function \c thrust::device_new allocates memory for
* an object and then creates an object at that location by calling a constructor.
* Occasionally, however, it is useful to separate those two operations.
* If each iterator in the range <tt>[result, result + n)</tt> points
* to uninitialized memory, then \p uninitialized_copy_n creates a copy of
* <tt>[first, first + n)</tt> in that range. That is, for each iterator \c i in
* the input, \p uninitialized_copy_n creates a copy of \c *i in the location pointed
* to by the corresponding iterator in the output range by \p InputIterator's
* \c value_type's copy constructor with *i as its argument.
*
* \param first The first element of the input range to copy from.
* \param n The number of elements to copy.
* \param result The first element of the output range to copy to.
* \return An iterator pointing to the last element of the output range.
*
* \tparam InputIterator is a model of <a href="http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>.
* \tparam Size is an integral type.
* \tparam ForwardIterator is a model of <a href="http://www.sgi.com/tech/stl/ForwardIterator.html">Forward Iterator</a>,
* \p ForwardIterator is mutable, and \p ForwardIterator's \c value_type has a constructor that takes
* a single argument whose type is \p InputIterator's \c value_type.
*
* The following code snippet demonstrates how to use \p uninitialized_copy to initialize
* a range of uninitialized memory.
*
* \code
* #include <thrust/uninitialized_copy.h>
* #include <thrust/device_malloc.h>
* #include <thrust/device_vector.h>
* ...
* struct Int
* {
* __host__ __device__
* Int(int x) : val(x) {}
* int val;
* };
* ...
* const int N = 137;
*
* Int val(46);
* thrust::device_vector<Int> input(N, val);
* thrust::device_ptr<Int> array = thrust::device_malloc<Int>(N);
* thrust::uninitialized_copy_n(input.begin(), N, array);
*
* // Int x = array[i];
* // x.val == 46 for all 0 <= i < N
* \endcode
*
* \see http://www.sgi.com/tech/stl/uninitialized_copy.html
* \see \c uninitialized_copy
* \see \c copy
* \see \c uninitialized_fill
* \see \c device_new
* \see \c device_malloc
*/
template<typename InputIterator, typename Size, typename ForwardIterator>
  ForwardIterator uninitialized_copy_n(InputIterator first,
                                       Size n,
                                       ForwardIterator result);

/*! \} // copying
*/

} // end thrust

#include <thrust/detail/uninitialized_copy.inl>

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