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/******************************************************************************
 * Copyright (c) 2011, Duane Merrill.  All rights reserved.
 * Copyright (c) 2011-2016, NVIDIA CORPORATION.  All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the NVIDIA CORPORATION nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 ******************************************************************************/

/**
 * \file
 * Random-access iterator types
 */

#pragma once

#include <iterator>
#include <iostream>

#include "../thread/thread_load.cuh"
#include "../thread/thread_store.cuh"
#include "../util_device.cuh"
#include "../util_debug.cuh"
#include "../util_namespace.cuh"

#if (CUDA_VERSION >= 5050) || defined(DOXYGEN_ACTIVE)  // This iterator is compatible with CUDA 5.5 and newer

#if (THRUST_VERSION >= 100700)    // This iterator is compatible with Thrust API 1.7 and newer
    #include <thrust/iterator/iterator_facade.h>
    #include <thrust/iterator/iterator_traits.h>
#endif // THRUST_VERSION


/// Optional outer namespace(s)
CUB_NS_PREFIX

/// CUB namespace
namespace cub {


/******************************************************************************
 * Static file-scope Tesla/Fermi-style texture references
 *****************************************************************************/

#ifndef DOXYGEN_SHOULD_SKIP_THIS    // Do not document

// Anonymous namespace
namespace {

/// Global texture reference specialized by type
template <typename T>
struct IteratorTexRef
{
    /// And by unique ID
    template <int UNIQUE_ID>
    struct TexId
    {
        // Largest texture word we can use in device
        typedef typename UnitWord<T>::DeviceWord DeviceWord;
        typedef typename UnitWord<T>::TextureWord TextureWord;

        // Number of texture words per T
        enum {
            DEVICE_MULTIPLE = sizeof(T) / sizeof(DeviceWord),
            TEXTURE_MULTIPLE = sizeof(T) / sizeof(TextureWord)
        };

        // Texture reference type
        typedef texture<TextureWord> TexRef;

        // Texture reference
        static TexRef ref;

        /// Bind texture
        static cudaError_t BindTexture(void *d_in, size_t &offset)
        {
            if (d_in)
            {
                cudaChannelFormatDesc tex_desc = cudaCreateChannelDesc<TextureWord>();
                ref.channelDesc = tex_desc;
                return (CubDebug(cudaBindTexture(&offset, ref, d_in)));
            }