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110 lines
3.5 KiB
HTML
110 lines
3.5 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Strict//EN">
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<html><head>
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<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
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<meta http-equiv="Content-Language" content="en-us">
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<title>Product</title><link rel="stylesheet" type="text/css" href="./style.css"></head>
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<body bgcolor="#ffffff">
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<h3><a name="over"></a>bit</h3>This is ugly but acording to Roberto, this is what Lua 5.2+ will have.
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<p class="MsoNormal" style="font-family: Verdana;">
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The problem is that <b>not </b>and <b>and</b> are Lua reserved words and cannot be used as table indexes.<br>
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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We could add .rot and .rotc to these :)
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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<br>
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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Res = bit.bnot( value ): unary negation
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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Res = bit.band( v1, v2, ... ): <b>bitwise </b>"and"
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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Res = bit.bor( v1, v2, ... ): <b>bitwise</b><b> </b>"or"
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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Res = bit.bxor( v1, v2, ... ): <b>bitwise</b><b> </b>"exclusive or"
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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Res = bit.lshift( value, pos ): shift "value" left "pos" positions.
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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Res = bit.rshift( value, pos ): shift "value" right "pos" positions. The sign is
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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not propagated.
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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Res = bit.arshift( value, pos ): shift "value" right "pos" positions. The sign
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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is propagated ("arithmetic shift").
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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Res = bit.bit( bitno ): a shortcut for bit.lshift( 1, bitno )
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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Res1, Res2, ... = bit.set( bitno, v1, v2, ... ): set the bit at position "bitno"
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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in v1, v2, ... to 1.
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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Res1, Res2, ... = bit.clear( bitno, v1, v2, ... ): set the bit at position
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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"bitno"in v1, v2, ... to 0.
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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Res = bit.isset( value, bitno ): returns true if bit at position "bitno" in
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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"value" is 1, false otherwise.
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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Res = bit.isclear( value, bitno ): returns true if bit at position "bitno" in
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</p>
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<p class="MsoNormal" style="font-family: Verdana;">
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"value" is 0, false otherwise.
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</p>
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<br style="font-family: Verdana;"></body></html>
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