dd4hep::DDSegmentation::BitField64 Class Reference

A bit field of 64bits that allows convenient declaration. More...

#include <BitField64.h>

Public Member Functions
virtual	~BitField64 ()
	BitField64 ()=delete
	BitField64 (const std::string &initString)
	BitField64 (const BitFieldCoder *coder)
	Initialize from existing BitFieldCoder. More...
CellID	getValue () const
void	setValue (CellID value)
void	setValue (unsigned low_Word, unsigned high_Word)
BitField64 &	operator() (CellID val)
void	reset ()
BitFieldValue	operator[] (size_t idx)
unsigned	highestBit () const
size_t	size () const
size_t	index (const std::string &name) const
BitFieldValue	operator[] (const std::string &name)
unsigned	lowWord () const
unsigned	highWord () const
std::string	fieldDescription () const
std::string	valueString () const

Protected Attributes
bool	_owner {true}
CellID	_value {}
const BitFieldCoder *	_coder {}

Friends
std::ostream &	operator<< (std::ostream &os, const BitField64 &b)

Detailed Description

A bit field of 64bits that allows convenient declaration.

and manipulation of sub fields of various widths.
Example:
BitField64 b("layer:7,system:-3,barrel:3,theta:32:11,phi:11" ) ;
b[ "layer" ] = 123 ;
b[ "system" ] = -4 ;
b[ "barrel" ] = 7 ;
b[ "theta" ] = 180 ;
b[ "phi" ] = 270 ;
...
int theta = b["theta"] ;
...
unsigned phiIndex = b.index("phi") ;
int phi = b[ phiIndex ] ;

Sep-2017: FG: re-implemented as lightweight wrapper around BitFieldCoder

Author

F.Gaede, DESY

Date

2013-06

Definition at line 110 of file BitField64.h.

Constructor & Destructor Documentation

~BitField64()

virtual dd4hep::DDSegmentation::BitField64::~BitField64 ( )

inlinevirtual

Definition at line 116 of file BitField64.h.

BitField64() [1/3]

dd4hep::DDSegmentation::BitField64::BitField64 ( )

delete

No default c'tor

BitField64() [2/3]

dd4hep::DDSegmentation::BitField64::BitField64 ( const std::string &  initString )

inline

The c'tor takes an initialization string of the form:
<fieldDesc>[,<fieldDesc>...]
fieldDesc = name:[start]:[-]length
where:
name: The name of the field
start: The start bit of the field. If omitted assumed to start immediately following previous field, or at the least significant bit if the first field.
length: The number of bits in the field. If preceeded by '-' the field is signed, otherwise unsigned.
Bit numbering is from the least significant bit (bit 0) to the most significant (bit 63).
Example: "layer:7,system:-3,barrel:3,theta:32:11,phi:11"

Definition at line 138 of file BitField64.h.

BitField64() [3/3]

dd4hep::DDSegmentation::BitField64::BitField64 ( const BitFieldCoder *  coder )

inline

Initialize from existing BitFieldCoder.

Definition at line 143 of file BitField64.h.

Member Function Documentation

fieldDescription()

std::string dd4hep::DDSegmentation::BitField64::fieldDescription ( ) const

inline

Return a valid description string of all fields

Definition at line 216 of file BitField64.h.

getValue()

CellID dd4hep::DDSegmentation::BitField64::getValue ( ) const

inline

Returns the current 64bit value

Definition at line 149 of file BitField64.h.

highestBit()

unsigned dd4hep::DDSegmentation::BitField64::highestBit ( ) const

inline

Highest bit used in fields [0-63]

Definition at line 183 of file BitField64.h.

highWord()

unsigned dd4hep::DDSegmentation::BitField64::highWord ( ) const

inline

The high word, bits 32-63

Definition at line 211 of file BitField64.h.

index()

size_t dd4hep::DDSegmentation::BitField64::index ( const std::string &  name ) const

inline

Index for field named 'name'

Definition at line 190 of file BitField64.h.

lowWord()

unsigned dd4hep::DDSegmentation::BitField64::lowWord ( ) const

inline

The low word, bits 0-31

Definition at line 207 of file BitField64.h.

operator()()

BitField64& dd4hep::DDSegmentation::BitField64::operator() ( CellID  val )

inline

Operator for setting a new value and accessing the BitField directly

Definition at line 162 of file BitField64.h.

operator[]() [1/2]

BitFieldValue dd4hep::DDSegmentation::BitField64::operator[] ( const std::string &  name )

inline

Access to field through name .

Definition at line 194 of file BitField64.h.

operator[]() [2/2]

BitFieldValue dd4hep::DDSegmentation::BitField64::operator[] ( size_t  idx )

inline

Acces to field through index

Definition at line 170 of file BitField64.h.

reset()

void dd4hep::DDSegmentation::BitField64::reset ( )

inline

Reset - same as setValue(0) - useful if the same encoder is used for many objects.

Definition at line 166 of file BitField64.h.

setValue() [1/2]

void dd4hep::DDSegmentation::BitField64::setValue ( CellID  value )

inline

Set a new 64bit value - bits not used in description are set to 0.

Definition at line 153 of file BitField64.h.

setValue() [2/2]

void dd4hep::DDSegmentation::BitField64::setValue ( unsigned  low_Word, unsigned  high_Word  )

inline

Set a new 64bit value given as high and low 32bit words.

Definition at line 157 of file BitField64.h.

size()

size_t dd4hep::DDSegmentation::BitField64::size ( ) const

inline

Number of values

Definition at line 186 of file BitField64.h.

valueString()

std::string dd4hep::DDSegmentation::BitField64::valueString

(

)

const

Return a string with a comma separated list of the current sub field values

Definition at line 12 of file BitField64.cpp.

Friends And Related Function Documentation

operator<<

std::ostream& operator<< ( std::ostream &  os, const BitField64 &  b  )

friend

Operator for dumping BitField64 to streams

Definition at line 27 of file BitField64.cpp.

Member Data Documentation

_coder

const BitFieldCoder* dd4hep::DDSegmentation::BitField64::_coder {}

protected

Definition at line 231 of file BitField64.h.

_owner

bool dd4hep::DDSegmentation::BitField64::_owner {true}

protected

Definition at line 229 of file BitField64.h.

_value

CellID dd4hep::DDSegmentation::BitField64::_value {}

protected

Definition at line 230 of file BitField64.h.

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

• DDCore/include/DDSegmentation/BitField64.h
• DDCore/src/segmentations/BitField64.cpp