v1::packed_int_array< BitsPerInteger, N > Class Template Reference

#include <hikogui/container/packed_int_array.hpp>

Public Types
using	value_type
	The value type of the unsigned integers that are stored in the array.

Public Member Functions
template<std::integral... Args>
constexpr	packed_int_array (Args... args) noexcept
	Constructor of the array.
constexpr size_t	size () const noexcept
	The number of integers stored in the array.
constexpr value_type	operator[] (size_t i) const noexcept
	Get the integer at an index.

Static Public Attributes
static constexpr size_t	bits_per_integer = BitsPerInteger
	Number of bits of the unsigned integer.
static constexpr size_t	store_size = ceil(bits_per_integer + CHAR_BIT - 1, size_t{CHAR_BIT}) / size_t{CHAR_BIT}
	Number of bytes required to hold the number of bits.

Friends
template<size_t I>
constexpr value_type	get (packed_int_array const &rhs) noexcept
	Get the integer at an index.

Detailed Description

template<size_t BitsPerInteger, size_t N>
class v1::packed_int_array< BitsPerInteger, N >

An array of integers.

The integers in the array are tightly packed without padding bits.

Template Parameters

BitsPerInteger	Number of bits of each integer, between 0 and 57.
N	The number of integers to store.

Member Typedef Documentation

value_type

template<size_t BitsPerInteger, size_t N>

using v1::packed_int_array< BitsPerInteger, N >::value_type

Initial value:

 
        std::conditional_t<sizeof(unsigned char) >= store_size, unsigned char,
        std::conditional_t<sizeof(unsigned short) >= store_size, unsigned short,
        std::conditional_t<sizeof(unsigned int) >= store_size, unsigned int,
        std::conditional_t<sizeof(unsigned long) >= store_size, unsigned long,
        unsigned long long>>>>

The value type of the unsigned integers that are stored in the array.

The size of the unsigned integer type is automatically selected to be the smallest type that can hold BitsPerInteger and can also be aligned/adjusted by up to 7 bits.

Constructor & Destructor Documentation

packed_int_array()

template<size_t BitsPerInteger, size_t N>

template<std::integral... Args>

constexpr v1::packed_int_array< BitsPerInteger, N >::packed_int_array ( Args... args )

inlineconstexprnoexcept

Constructor of the array.

Parameters

args	A list of integers.

Member Function Documentation

operator[]()

template<size_t BitsPerInteger, size_t N>

constexpr value_type v1::packed_int_array< BitsPerInteger, N >::operator[] ( size_t i ) const

inlineconstexprnoexcept

Get the integer at an index.

If possible this function will use load() to do an efficient unaligned load from memory.

Note

It is undefined behavior if i is out-of-bound.

Parameters

i	An index into the array.

Returns

The unsigned integer retrieved from the array.

size()

template<size_t BitsPerInteger, size_t N>

constexpr size_t v1::packed_int_array< BitsPerInteger, N >::size ( ) const

inlineconstexprnoexcept

The number of integers stored in the array.

Friends And Related Symbol Documentation

get

template<size_t BitsPerInteger, size_t N>

template<size_t I>

constexpr value_type get ( packed_int_array< BitsPerInteger, N > const & rhs )

friend

Get the integer at an index.

If possible this function will use load() to do an efficient unaligned load from memory.

Note

It is undefined behavior if I is out-of-bound.

Template Parameters

I	An index into the array.

Parameters

rhs	The packed int array to read from.

Returns

The unsigned integer retrieved from the array.

Field Documentation

bits_per_integer

template<size_t BitsPerInteger, size_t N>

constexpr size_t v1::packed_int_array< BitsPerInteger, N >::bits_per_integer = BitsPerInteger

staticconstexpr

Number of bits of the unsigned integer.

store_size

template<size_t BitsPerInteger, size_t N>

constexpr size_t v1::packed_int_array< BitsPerInteger, N >::store_size = ceil(bits_per_integer + CHAR_BIT - 1, size_t{CHAR_BIT}) / size_t{CHAR_BIT}

staticconstexpr

Number of bytes required to hold the number of bits.

This needs extra 7 bits for alignment/adjustment.

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

• hikogui/src/hikogui/container/packed_int_array.hpp