Program Listing for File DirectAccessCodes.h

↰ Return to documentation for file (ADS/compression/DirectAccessCodes.h)

/*--------------------------------------------------------------------------*/
/*------------------------ File DirectAccessCodes.h ------------------------*/
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/*----------------------------- DEFINITIONS --------------------------------*/
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#ifndef __ADS_DirectAccessCodes
 #define __ADS_DirectAccessCodes
                      /* self-identification: #endif constant */

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/*------------------------------ INCLUDES ----------------------------------*/
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#include "ADS/Contract.h"
#include "ADS/succinct/BitVector.h"
#include "ADS/succinct/RankSelect.h"

#include <array>
#include <bit>
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <span>
#include <vector>

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/*--------------------------- NAMESPACE ------------------------------------*/
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namespace ADS {

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/*------------------------- CLASS DirectAccessCodes ------------------------*/
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class DirectAccessCodes {

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 public:

 DirectAccessCodes( void ) = default;

 explicit DirectAccessCodes( std::span< const std::uint64_t > x );

 DirectAccessCodes( std::span< const std::uint64_t > x , int b );

 [[nodiscard]] std::size_t size( void ) const { return( f_n ); }

 [[nodiscard]] bool empty( void ) const { return( f_n == 0 ); }

 [[nodiscard]] std::uint64_t access( std::size_t i ) const;

 [[nodiscard]] std::uint64_t operator[]( std::size_t i ) const {
  return( access( i ) );
  }

 [[nodiscard]] std::vector< int > widths( void ) const;

 [[nodiscard]] std::size_t sizeInBits( void ) const;

/*------------------------- THE STANDARD INTERFACE -------------------------*/

 using value_type = std::uint64_t;
 using size_type = std::size_t;
 using difference_type = std::ptrdiff_t;
 using reference = std::uint64_t;
 using const_reference = std::uint64_t;
 using const_iterator = SubscriptIterator< DirectAccessCodes ,
                                           std::uint64_t >;
 using iterator = const_iterator;

 [[nodiscard]] const_iterator begin( void ) const {
  return( const_iterator( this , 0 ) );
  }
 [[nodiscard]] const_iterator end( void ) const {
  return( const_iterator( this , f_n ) );
  }
 [[nodiscard]] const_iterator cbegin( void ) const { return( begin() ); }
 [[nodiscard]] const_iterator cend( void ) const { return( end() ); }

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 private:

 struct Level {
  int width = 0 , shift = 0;
  BitVector chunks;
  RankSelect more;
  };

 void build( std::span< const std::uint64_t > x ,
             const std::array< int , 65 > & cut , int w );

 std::size_t f_n = 0;
 std::vector< Level > f_lev;

 };  // end( class DirectAccessCodes )

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}  // end( namespace ADS )

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/*-------------------------- IMPLEMENTATION --------------------------------*/
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#include "ADS/compression/impl/DirectAccessCodes.tpp"

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#endif  /* DirectAccessCodes.h included */

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/*---------------------- End File DirectAccessCodes.h ----------------------*/
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