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BitMaskSet
Last update:
May 18, 2026
Description
Performs a bitwise mask set operation.
Returns
A number, bitwise masked with length bits of mask beginning at start.
Category
Function syntax
BitMaskSet(number, mask, start, length) |
See also
Parameters
Parameter | Description |
number | 32-bit signed integer |
mask | 32-bit signed integer; mask |
start | Integer, in the range 0-31, inclusive; start bit for mask |
length | Integer, in the range 0-31, inclusive; length of mask |
Usage
Bit functions operate on 32-bit signed integers, in the range -2147483648 - 2147483647.
Example
<h3>BitMaskSet Example</h3>
<p>Returns number bitwise masked with length bits of mask beginning at start.</p>
<p>BitMaskSet(255, 255, 4, 4): <cfoutput>#BitMaskSet(255, 255, 4, 4)#</cfoutput></p>
<p>BitMaskSet(255, 0, 4, 4): <cfoutput>#BitMaskSet(255, 0, 4, 4)#</cfoutput></p>
<p>BitMaskSet(0, 15, 4, 4): <cfoutput>#BitMaskSet(0, 15, 4, 4)#</cfoutput></p>Example
<cfscript>
number = 0 ;
mask = 15 ;
start = 4;
length = 4;
writeOutput(bitmaskset(number, mask, start, length)) ;
</cfscript>
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