Outer-totalistic binary rule encoded as two 9-bit bitmasks. More...

#include <tpl_ca_hashlife.H>

Public Member Functions
constexpr bool	apply (const bool current, const std::uint8_t n) const noexcept
	True iff a cell with `current` state and `n` live neighbours is alive next.

constexpr bool	operator== (const Outer_Totalistic_Binary_Rule &) const noexcept=default

Public Attributes
std::uint16_t	birth_mask
	`bit i` ⇒ dead cell with `i` live neighbours becomes alive

std::uint16_t	survival_mask
	`bit i` ⇒ live cell with `i` live neighbours stays alive

Detailed Description

Outer-totalistic binary rule encoded as two 9-bit bitmasks.

Bit i (0 ≤ i ≤ 8) of birth_mask is set iff a dead cell with i live Moore-radius-1 neighbours becomes alive in the next generation. Bit i of survival_mask is set iff a live cell with i live neighbours stays alive.

Pre-defined instances:

Conway_Life — B3/S23.
HighLife — B36/S23.
Day_And_Night — B3678/S34678.
Seeds — B2/S (no survival).

Definition at line 107 of file tpl_ca_hashlife.H.

Member Function Documentation

◆ apply()

constexpr bool Aleph::CA::Outer_Totalistic_Binary_Rule::apply	(	const bool	current,
		const std::uint8_t	n
	)		const

inlineconstexprnoexcept

True iff a cell with current state and n live neighbours is alive next.

Definition at line 113 of file tpl_ca_hashlife.H.

References birth_mask, and survival_mask.

Referenced by Aleph::CA::Hashlife_Engine::evolve_level_2().

◆ operator==()

constexpr bool Aleph::CA::Outer_Totalistic_Binary_Rule::operator== ( const Outer_Totalistic_Binary_Rule & ) const

constexprdefaultnoexcept

Member Data Documentation

◆ birth_mask

std::uint16_t Aleph::CA::Outer_Totalistic_Binary_Rule::birth_mask

bit i ⇒ dead cell with i live neighbours becomes alive

Definition at line 109 of file tpl_ca_hashlife.H.

Referenced by apply().

◆ survival_mask

std::uint16_t Aleph::CA::Outer_Totalistic_Binary_Rule::survival_mask

bit i ⇒ live cell with i live neighbours stays alive

Definition at line 110 of file tpl_ca_hashlife.H.