ColdFusion 9 CFML Reference

BitMaskClear

Description

Performs a bitwise mask clear operation.

Returns

A number, bitwise cleared, with length bits beginning at start.

Category

Mathematical functions

Function syntax

BitMaskClear(number, start, length)

See also

BitMaskRead, BitMaskSet

Parameters

Parameter

Description

number

32-bit signed integer

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>BitMaskClear Example</h3> 
 
<p>Returns number bitwise cleared with length bits beginning from start.</p> 
 
<p>BitMaskClear(255, 4, 4): <cfoutput>#BitMaskClear(255, 4, 4)#</cfoutput></p> 
<p>BitMaskClear(255, 0, 4): <cfoutput>#BitMaskClear(255, 0, 4)#</cfoutput></p> 
<p>BitMaskClear(128, 0, 7): <cfoutput>#BitMaskClear(128, 0, 7)#</cfoutput></p>