device_partition.cuh

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/******************************************************************************
 * Copyright (c) 2011, Duane Merrill.  All rights reserved.
 * Copyright (c) 2011-2018, NVIDIA CORPORATION.  All rights reserved.
 *
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 * 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.
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 *       names of its contributors may be used to endorse or promote products
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#pragma once

#include <stdio.h>
#include <iterator>

#include "dispatch/dispatch_select_if.cuh"
#include "../util_namespace.cuh"

CUB_NS_PREFIX

namespace cub {


struct DevicePartition
{
    template <
        typename                    InputIteratorT,
        typename                    FlagIterator,
        typename                    OutputIteratorT,
        typename                    NumSelectedIteratorT>
    CUB_RUNTIME_FUNCTION __forceinline__
    static cudaError_t Flagged(
        void*               d_temp_storage,                
        size_t                      &temp_storage_bytes,            
        InputIteratorT              d_in,                           
        FlagIterator                d_flags,                        
        OutputIteratorT             d_out,                          
        NumSelectedIteratorT        d_num_selected_out,             
        int                         num_items,                      
        cudaStream_t                stream             = 0,         
        bool                        debug_synchronous  = false)     
    {
        typedef int                     OffsetT;         // Signed integer type for global offsets
        typedef NullType                SelectOp;       // Selection op (not used)
        typedef NullType                EqualityOp;     // Equality operator (not used)

        return DispatchSelectIf<InputIteratorT, FlagIterator, OutputIteratorT, NumSelectedIteratorT, SelectOp, EqualityOp, OffsetT, true>::Dispatch(
            d_temp_storage,
            temp_storage_bytes,
            d_in,
            d_flags,
            d_out,
            d_num_selected_out,
            SelectOp(),
            EqualityOp(),
            num_items,
            stream,
            debug_synchronous);
    }


    template <
        typename                    InputIteratorT,
        typename                    OutputIteratorT,
        typename                    NumSelectedIteratorT,
        typename                    SelectOp>
    CUB_RUNTIME_FUNCTION __forceinline__
    static cudaError_t If(
        void*               d_temp_storage,                
        size_t                      &temp_storage_bytes,            
        InputIteratorT              d_in,                           
        OutputIteratorT             d_out,                          
        NumSelectedIteratorT        d_num_selected_out,             
        int                         num_items,                      
        SelectOp                    select_op,                      
        cudaStream_t                stream             = 0,         
        bool                        debug_synchronous  = false)     
    {
        typedef int                     OffsetT;         // Signed integer type for global offsets
        typedef NullType*               FlagIterator;   // FlagT iterator type (not used)
        typedef NullType                EqualityOp;     // Equality operator (not used)

        return DispatchSelectIf<InputIteratorT, FlagIterator, OutputIteratorT, NumSelectedIteratorT, SelectOp, EqualityOp, OffsetT, true>::Dispatch(
            d_temp_storage,
            temp_storage_bytes,
            d_in,
            NULL,
            d_out,
            d_num_selected_out,
            select_op,
            EqualityOp(),
            num_items,
            stream,
            debug_synchronous);
    }

};

}               // CUB namespace
CUB_NS_POSTFIX  // Optional outer namespace(s)