Dune::bigunsignedint< k > Class Template Reference

Portable very large unsigned integers. More...

#include <dune/common/bigunsignedint.hh>

Public Member Functions
	bigunsignedint ()
	Construct uninitialized.
template<typename Signed >
	bigunsignedint (Signed x, typename std::enable_if< std::is_integral< Signed >::value &&std::is_signed< Signed >::value >::type *=0)
	Construct from signed int.
	bigunsignedint (std::uintmax_t x)
	Construct from unsigned int.
void	print (std::ostream &s) const
	Print number in hex notation.
bigunsignedint< k >	operator+ (const bigunsignedint< k > &x) const
	add
bigunsignedint< k > &	operator+= (const bigunsignedint< k > &x)
bigunsignedint< k >	operator- (const bigunsignedint< k > &x) const
	subtract
bigunsignedint< k > &	operator-= (const bigunsignedint< k > &x)
bigunsignedint< k >	operator* (const bigunsignedint< k > &x) const
	multiply
bigunsignedint< k > &	operator*= (const bigunsignedint< k > &x)
bigunsignedint< k > &	operator++ ()
	prefix increment
bigunsignedint< k >	operator/ (const bigunsignedint< k > &x) const
bigunsignedint< k > &	operator/= (const bigunsignedint< k > &x)
bigunsignedint< k >	operator% (const bigunsignedint< k > &x) const
bigunsignedint< k > &	operator%= (const bigunsignedint< k > &x)
bigunsignedint< k >	operator& (const bigunsignedint< k > &x) const
	bitwise and
bigunsignedint< k > &	operator&= (const bigunsignedint< k > &x)
bigunsignedint< k >	operator^ (const bigunsignedint< k > &x) const
	bitwise exor
bigunsignedint< k > &	operator^= (const bigunsignedint< k > &x)
bigunsignedint< k >	operator| (const bigunsignedint< k > &x) const
	bitwise or
bigunsignedint< k > &	operator|= (const bigunsignedint< k > &x)
bigunsignedint< k >	operator~ () const
	bitwise complement
bigunsignedint< k >	operator<< (int i) const
	left shift
bigunsignedint< k >	operator>> (int i) const
	right shift
bool	operator< (const bigunsignedint< k > &x) const
	less than
bool	operator<= (const bigunsignedint< k > &x) const
	less than or equal
bool	operator> (const bigunsignedint< k > &x) const
	greater than
bool	operator>= (const bigunsignedint< k > &x) const
	greater or equal
bool	operator== (const bigunsignedint< k > &x) const
	equal
bool	operator!= (const bigunsignedint< k > &x) const
	not equal
std::uint_least32_t	touint () const
	export to other types
double	todouble () const
	Convert to a double.

Static Public Attributes
static constexpr int	bits = std::numeric_limits<std::uint16_t>::digits
static constexpr int	n = k/bits+(k%bits!=0)
static constexpr int	hexdigits = 4
static constexpr int	bitmask = 0xFFFF
static constexpr int	compbitmask = 0xFFFF0000
static constexpr int	overflowmask = 0x1

Friends
class	bigunsignedint< k/2 >
struct	MPITraits< bigunsignedint< k > >
int	bit_width (const bigunsignedint &arg)
	Bit width.
int	countl_zero (const bigunsignedint &arg)
	Count left zero bits.
std::size_t	hash_value (const bigunsignedint &arg)

Detailed Description

template<int k>
class Dune::bigunsignedint< k >

Portable very large unsigned integers.

Implements (arbitrarily) large unsigned integers to be used as global ids in some grid managers. Size is a template parameter.

Template Parameters

k	Number of bits of the integer type

Member Function Documentation

operator%()

template<int k>

bigunsignedint< k > Dune::bigunsignedint< k >::operator%

(

const bigunsignedint< k > &

x

)

const

modulo

Warning

This function is very slow and its usage should be prevented if possible

operator&()

template<int k>

bigunsignedint< k > Dune::bigunsignedint< k >::operator&

(

const bigunsignedint< k > &

x

)

const

bitwise and

operator*()

template<int k>

bigunsignedint< k > Dune::bigunsignedint< k >::operator*

(

const bigunsignedint< k > &

x

)

const

multiply

operator+()

template<int k>

bigunsignedint< k > Dune::bigunsignedint< k >::operator+

(

const bigunsignedint< k > &

x

)

const

add

operator-()

template<int k>

bigunsignedint< k > Dune::bigunsignedint< k >::operator-

(

const bigunsignedint< k > &

x

)

const

subtract

operator/()

template<int k>

bigunsignedint< k > Dune::bigunsignedint< k >::operator/

(

const bigunsignedint< k > &

x

)

const

divide

Warning

This function is very slow and its usage should be prevented if possible

operator^()

template<int k>

bigunsignedint< k > Dune::bigunsignedint< k >::operator^

(

const bigunsignedint< k > &

x

)

const

bitwise exor

operator|()

template<int k>

bigunsignedint< k > Dune::bigunsignedint< k >::operator|

(

const bigunsignedint< k > &

x

)

const

bitwise or

Friends And Related Symbol Documentation

bigunsignedint< k/2 >

template<int k>

friend class bigunsignedint< k/2 >

friend

bit_width

template<int k>

int bit_width ( const bigunsignedint< k > &  arg )

friend

Bit width.

If x is not zero, calculates the number of bits needed to store the value arg

countl_zero

template<int k>

int countl_zero ( const bigunsignedint< k > &  arg )

friend

Count left zero bits.

The number of consecutive ​0​ bits in the value of arg, starting from the most significant bit

hash_value

template<int k>

std::size_t hash_value ( const bigunsignedint< k > &  arg )

friend

MPITraits< bigunsignedint< k > >

template<int k>

friend struct MPITraits< bigunsignedint< k > >

friend

Member Data Documentation

bitmask

template<int k>

constexpr int Dune::bigunsignedint< k >::bitmask = 0xFFFF

staticconstexpr

bits

template<int k>

constexpr int Dune::bigunsignedint< k >::bits = std::numeric_limits<std::uint16_t>::digits

staticconstexpr

compbitmask

template<int k>

constexpr int Dune::bigunsignedint< k >::compbitmask = 0xFFFF0000

staticconstexpr

hexdigits

template<int k>

constexpr int Dune::bigunsignedint< k >::hexdigits = 4

staticconstexpr

n

template<int k>

constexpr int Dune::bigunsignedint< k >::n = k/bits+(k%bits!=0)

staticconstexpr

overflowmask

template<int k>

constexpr int Dune::bigunsignedint< k >::overflowmask = 0x1

staticconstexpr

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

• bigunsignedint.hh