EMAN::BitStream< T > Class Template Reference

#include <eerio.h>

Collaboration diagram for EMAN::BitStream< T >:

Public Member Functions
	BitStream (T *buf)
T	get_bits (int N)

Private Attributes
T *	buffer
T	cur
const size_t	max_num_bits = 8*sizeof(T)
size_t	bit_counter = max_num_bits

Friends
std::ostream &	operator<< (std::ostream &out, const BitStream &obj)

Detailed Description

template<class T>
class EMAN::BitStream< T >

Definition at line 44 of file eerio.h.

Constructor & Destructor Documentation

BitStream()

template<class T >

EMAN::BitStream< T >::BitStream ( T *  buf )

inline

Definition at line 46 of file eerio.h.

                : buffer(buf), cur(*buffer)
                {}

Member Function Documentation

get_bits()

template<class T >

T EMAN::BitStream< T >::get_bits ( int  N )

inline

Definition at line 50 of file eerio.h.

                                  {
                        auto result = cur & ((1 << N) - 1);
 
                        if(N < bit_counter) {
                                cur        >>= N;
                                bit_counter -= N;
                        }
                        else {
                                auto remaining_bits = N - bit_counter;
 
                                cur = *(++buffer);
                                result |= ((cur & ((1 << remaining_bits) - 1)) << bit_counter);
 
                                cur >>= remaining_bits;
                                bit_counter = max_num_bits - remaining_bits;
                        }
 
                        return result;
                }

References EMAN::BitStream< T >::bit_counter, EMAN::BitStream< T >::buffer, EMAN::BitStream< T >::cur, and EMAN::BitStream< T >::max_num_bits.

Friends And Related Function Documentation

operator<<

template<class T >

std::ostream & operator<< ( std::ostream &  out, const BitStream< T > &  obj  )

friend

Definition at line 76 of file eerio.h.

                                                                                     {
                        return out<<"cur: "<<std::bitset<8*sizeof(T)>(obj.cur)
                                                <<endl
                                                <<"bit_counter: "<<obj.bit_counter<<endl
                                                <<"max_num_bits: "<<obj.max_num_bits<<endl;
                }

Member Data Documentation

bit_counter

template<class T >

size_t EMAN::BitStream< T >::bit_counter = max_num_bits

private

Definition at line 74 of file eerio.h.

Referenced by EMAN::BitStream< T >::get_bits().

buffer

template<class T >

T* EMAN::BitStream< T >::buffer

private

Definition at line 71 of file eerio.h.

Referenced by EMAN::BitStream< T >::get_bits().

cur

template<class T >

T EMAN::BitStream< T >::cur

private

Definition at line 72 of file eerio.h.

Referenced by EMAN::BitStream< T >::get_bits().

max_num_bits

template<class T >

const size_t EMAN::BitStream< T >::max_num_bits = 8*sizeof(T)

private

Definition at line 73 of file eerio.h.

Referenced by EMAN::BitStream< T >::get_bits().

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The documentation for this class was generated from the following file:

• eerio.h