ArraySampleKey.h

//-*****************************************************************************
//
// Copyright (c) 2009-2012,
//  Sony Pictures Imageworks Inc. and
//  Industrial Light & Magic, a division of Lucasfilm Entertainment Company Ltd.
//
// 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 Sony Pictures Imageworks, nor
// Industrial Light & Magic, nor the names of their 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 THE COPYRIGHT
// OWNER OR CONTRIBUTORS 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,
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//
//-*****************************************************************************
 
#ifndef Alembic_AbcCoreAbstract_ArraySampleKey_h
#define Alembic_AbcCoreAbstract_ArraySampleKey_h
 
#include <Alembic/AbcCoreAbstract/Foundation.h>
#include <Alembic/AbcCoreAbstract/DataType.h>
 
namespace Alembic {
namespace AbcCoreAbstract {
namespace ALEMBIC_VERSION_NS {
 
struct ArraySampleKey : public Alembic::Util::totally_ordered<ArraySampleKey>
{
    uint64_t numBytes;

    PlainOldDataType origPOD;

    PlainOldDataType readPOD;
 
    Digest digest;
 
    bool operator==( const ArraySampleKey &iRhs ) const
    {
        return ( ( numBytes == iRhs.numBytes ) &&
                 ( origPOD  == iRhs.origPOD  ) &&
                 ( readPOD  == iRhs.readPOD  ) &&
                 ( digest ==   iRhs.digest ) );
    };
 
    bool operator<( const ArraySampleKey &iRhs ) const
    {
        return ( numBytes < iRhs.numBytes ? true :
                 ( numBytes > iRhs.numBytes ? false :
 
                   ( origPOD < iRhs.origPOD ? true :
                     ( origPOD > iRhs.origPOD ? false :
 
                       ( readPOD < iRhs.readPOD ? true :
                         ( readPOD > iRhs.readPOD ? false :
 
                           ( digest < iRhs.digest ) ) ) ) ) ) );
    };
 
};
 
//-*****************************************************************************
// Equality operator.
struct ArraySampleKeyEqualTo
{
    typedef ArraySampleKey first_argument_type;
    typedef ArraySampleKey second_argument_type;
    typedef bool result_type;
 
    bool operator()( ArraySampleKey const &a,
                     ArraySampleKey const &b ) const
    {
        return a == b;
    }
};
 
//-*****************************************************************************
// Hash function
inline size_t StdHash( ArraySampleKey const &a )
{
    // Theoretically, the bits of our hash are uniformly
    // randomly distributed, so it doesn't matter which of the 128
    // bits we use to generate the 64 bits that we return as the hash
    // key. So, I'll just do the simple thing.
    return *(( const size_t * )&a.digest);
}
 
//-*****************************************************************************
struct ArraySampleKeyStdHash
{
    typedef ArraySampleKey argument_type;
    typedef size_t result_type;
 
    size_t operator()( ArraySampleKey const &a ) const
    {
        return StdHash( a );
    }
};
 
//-*****************************************************************************
template <class MAPPED>
struct UnorderedMapUtil
{
    typedef Alembic::Util::unordered_map<ArraySampleKey,
                                         MAPPED,
                                         ArraySampleKeyStdHash,
                                         ArraySampleKeyEqualTo> umap_type;
};
 
} // End namespace ALEMBIC_VERSION_NS
 
using namespace ALEMBIC_VERSION_NS;
 
} // End namespace AbcCoreAbstract
} // End namespace Alembic
 
#endif