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Informations about the package php-ds-bitmask

PHP Bitmask Support

Build Status Coverage Status Total Downloads License -->

A class to support bitmask operations.

Install

composer require calabrothers/php-ds-bitmask

Test

composer install
composer test

HowTo

Building an object is done via constructor or factory function:

$X = new Bitmask(3);       // 000...0011
$Y = Bitmask::create(5);   // 000...0101

Available functions:

Let us consider the classic three logical operators:

Operator Notation
AND(a,b) ![AND](https://latex.codecogs.com/gif.latex?a%20%5Cwedge%20b)
OR(a,b) ![OR](https://latex.codecogs.com/gif.latex?a%20%5Cvee%20b)
NOT(a) ![NOT](https://latex.codecogs.com/gif.latex?%5Cbar%20a)

Then the basic Bitmask object will provide the following operators:

PHP Command Bitwise Operation
$x->setValue($v) ![SetValue](https://latex.codecogs.com/gif.latex?x%20%3D%20v)
$x->setBit($b) ![SetBit](https://latex.codecogs.com/gif.latex?x%20%3D%20x%20%5Cvee%202%5Eb)
$x->clearBit($b) ![ClearBit](https://latex.codecogs.com/gif.latex?x%20%3D%20x%20%5Cwedge%20%5Cbar%7B2%5Eb%7D)
$x->checkBit($b) ![CheckBit](https://latex.codecogs.com/gif.latex?%28x%20%5Cwedge%202%5Eb%29%20%3E%200)
$x->setMask($m) ![SetMask](https://latex.codecogs.com/gif.latex?x%20%3D%20x%20%5Cvee%20m)
$x->clearMask($m) ![ClearMask](https://latex.codecogs.com/gif.latex?x%20%3D%20x%20%5Cwedge%20%5Cbar%7Bm%7D)
$x->checkMask($m) ![CheckMask](https://latex.codecogs.com/gif.latex?%28x%20%5Cwedge%20m%29%20%3E%200)
$x->not() ![NotFcn](https://latex.codecogs.com/gif.latex?y%20%3D%20%5Cbar%7Bx%7D)
$x->or($y) ![OrFcn](https://latex.codecogs.com/gif.latex?z%20%3D%20x%20%5Cvee%20y)
$x->and($y) ![AndFcn](https://latex.codecogs.com/gif.latex?z%20%3D%20x%20%5Cwedge%20y)

Example

$X = new Bitmask(3);  
echo $X;                                // Bitmask(64|62|2) [ 0000 0011 ]

$Y = Bitmask::create(5);    
echo $Y;                                // Bitmask(64|61|3) [ 0000 0101 ]

// Return new object
echo $X->and($Y);                       // Bitmask(64|61|3) [ 0000 0101 ]       
echo $X->and($Y);                       // Bitmask(64|61|3) [ 0000 0111 ]

// Alter the object
echo $X->clearBit(0);                   // Bitmask(64|62|2) [ 0000 0010 ]
echo $X->setBit(4);                     // Bitmask(64|59|5) [ 0001 0010 ]

// Check bit (convention starts from 0)
echo $X->checkBit(2) ? "true":"false";  // false
echo $X->checkBit(4) ? "true":"false";  // true

Credits

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License

The MIT License (MIT). Please see LICENSE for more information.

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