senf::UIntFieldParser< Start, End > Struct Template Reference
[Integer parsers]

Parse unsigned bitfield with up to 32bit's. More...

#include <senf/Packets/IntParser.hh>

Inheritance diagram for senf::UIntFieldParser< Start, End >:

[legend]

List of all members.

Detailed Description

template<unsigned Start, unsigned End>
struct senf::UIntFieldParser< Start, End >

Parse unsigned bitfield with up to 32bit's.

This parser will parse a bitfield beginning at the bit Start and ending before End. Bits are numbered most significant bit first as this is the customary numbering used when defining packet data structures. Start and End can be arbitrary as long as the field is between 1 and 32 bits in size. In other words, IntFieldParser<53,81> is a valid 30 bit field.

When defining a compound parser with several bit fields, you need to take care of the fact, that several integer field parsers will interpret the same data bytes (but not the same bits). It is customary for several integer field parsers to start at the same byte offset with ever increasing bit offsets.

See also:: Integer parsers

Implementation note:: The integer field parser is highly optimized. Since the bit positions are compile-time constants, the compiler will create optimized bit-masks to directly access the value. The parser is also optimized to access the minimum number of data bytes necessary.

Definition at line 525 of file IntParser.hh.


Public Types
typedef boost::uint32_t	value_type
Public Member Functions
	UIntFieldParser (data_iterator i, state_type s)
value_type	value () const
void	value (value_type v)
UIntFieldParser const &	operator= (value_type other)
Static Public Attributes
static size_type const	start_bit = Start
static size_type const	end_bit = End
static size_type const	fixed_bytes = (End-1)/8+1
static value_type const	min_value = 0u
static value_type const	max_value = boost::low_bits_mask_t<End-Start>::sig_bits
Related Functions
(Note that these are not member functions.)
template<unsigned Start, unsigned End>
std::ostream &	operator<< (std::ostream &os, UIntFieldParser< Start, End > const &i)
	Write parsed value to stream.