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WeakTable (Luaj API)
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SUMMARY: <A HREF="#nested_class_summary">NESTED</A> | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD>
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org.luaj.vm2</FONT>
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Class WeakTable</H2>
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<PRE>
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java.lang.Object
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<IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>org.luaj.vm2.WeakTable</B>
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</PRE>
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<HR>
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<DL>
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<DT><PRE>public class <B>WeakTable</B><DT>extends java.lang.Object</DL>
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</PRE>
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<P>
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Subclass of <A HREF="../../../org/luaj/vm2/LuaTable.html" title="class in org.luaj.vm2"><CODE>LuaTable</CODE></A> that provides weak key and weak value semantics.
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<p>
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Normally these are not created directly, but indirectly when changing the mode
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of a <A HREF="../../../org/luaj/vm2/LuaTable.html" title="class in org.luaj.vm2"><CODE>LuaTable</CODE></A> as lua script executes.
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<p>
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However, calling the constructors directly when weak tables are required from
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Java will reduce overhead.
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<B>Nested Class Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static class</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../org/luaj/vm2/WeakTable.WeakSlot.html" title="class in org.luaj.vm2">WeakTable.WeakSlot</A></B></CODE>
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<BR>
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
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<B>Constructor Summary</B></FONT></TH>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD><CODE><B><A HREF="../../../org/luaj/vm2/WeakTable.html#WeakTable(boolean, boolean, org.luaj.vm2.LuaValue)">WeakTable</A></B>(boolean weakkeys,
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boolean weakvalues,
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<A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A> backing)</CODE>
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<BR>
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Construct a table with weak keys, weak values, or both</TD>
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</TR>
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</TABLE>
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<!-- ========== METHOD SUMMARY =========== -->
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<A NAME="method_summary"><!-- --></A>
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<B>Method Summary</B></FONT></TH>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE> <A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A></CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../org/luaj/vm2/WeakTable.html#arrayget(org.luaj.vm2.LuaValue[], int)">arrayget</A></B>(<A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A>[] array,
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int index)</CODE>
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<BR>
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Returns the value at the given index in the array, or null if it is a weak reference that
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has been dropped.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE> org.luaj.vm2.LuaTable.Slot</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../org/luaj/vm2/WeakTable.html#entry(org.luaj.vm2.LuaValue, org.luaj.vm2.LuaValue)">entry</A></B>(<A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A> key,
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<A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A> value)</CODE>
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<BR>
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Return an instance of Slot appropriate for the given key and value.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static <A HREF="../../../org/luaj/vm2/LuaTable.html" title="class in org.luaj.vm2">LuaTable</A></CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../org/luaj/vm2/WeakTable.html#make(boolean, boolean)">make</A></B>(boolean weakkeys,
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boolean weakvalues)</CODE>
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<BR>
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</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>protected static <A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A></CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../org/luaj/vm2/WeakTable.html#strengthen(java.lang.Object)">strengthen</A></B>(java.lang.Object ref)</CODE>
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<BR>
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Unwrap a LuaValue from a WeakReference and/or WeakUserdata.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE> <A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A></CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../org/luaj/vm2/WeakTable.html#toLuaValue()">toLuaValue</A></B>()</CODE>
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<BR>
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Return this metatable as a LuaValue.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE> boolean</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../org/luaj/vm2/WeakTable.html#useWeakKeys()">useWeakKeys</A></B>()</CODE>
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<BR>
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Return whether or not this table's keys are weak.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE> boolean</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../org/luaj/vm2/WeakTable.html#useWeakValues()">useWeakValues</A></B>()</CODE>
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<BR>
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Return whether or not this table's values are weak.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>protected static <A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A></CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../org/luaj/vm2/WeakTable.html#weaken(org.luaj.vm2.LuaValue)">weaken</A></B>(<A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A> value)</CODE>
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<BR>
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Self-sent message to convert a value to its weak counterpart</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE> <A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A></CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../org/luaj/vm2/WeakTable.html#wrap(org.luaj.vm2.LuaValue)">wrap</A></B>(<A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A> value)</CODE>
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<BR>
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Returns the given value wrapped in a weak reference if appropriate.</TD>
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</TR>
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</TABLE>
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<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
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<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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</TR>
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</TABLE>
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<P>
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<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<A NAME="constructor_detail"><!-- --></A>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
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<B>Constructor Detail</B></FONT></TH>
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</TR>
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</TABLE>
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<A NAME="WeakTable(boolean, boolean, org.luaj.vm2.LuaValue)"><!-- --></A><H3>
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WeakTable</H3>
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<PRE>
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public <B>WeakTable</B>(boolean weakkeys,
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boolean weakvalues,
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<A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A> backing)</PRE>
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<DL>
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<DD>Construct a table with weak keys, weak values, or both
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<P>
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<DL>
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<DT><B>Parameters:</B><DD><CODE>weakkeys</CODE> - true to let the table have weak keys<DD><CODE>weakvalues</CODE> - true to let the table have weak values</DL>
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</DL>
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<!-- ============ METHOD DETAIL ========== -->
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<A NAME="method_detail"><!-- --></A>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
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<B>Method Detail</B></FONT></TH>
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</TR>
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</TABLE>
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<A NAME="make(boolean, boolean)"><!-- --></A><H3>
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make</H3>
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<PRE>
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public static <A HREF="../../../org/luaj/vm2/LuaTable.html" title="class in org.luaj.vm2">LuaTable</A> <B>make</B>(boolean weakkeys,
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boolean weakvalues)</PRE>
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<DL>
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<DD><DL>
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</DL>
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</DD>
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<DD><DL>
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</DL>
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</DD>
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</DL>
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<HR>
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<A NAME="useWeakKeys()"><!-- --></A><H3>
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useWeakKeys</H3>
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<PRE>
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public boolean <B>useWeakKeys</B>()</PRE>
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<DL>
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<DD>Return whether or not this table's keys are weak.
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<P>
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<DD><DL>
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</DL>
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</DD>
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<DD><DL>
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</DL>
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</DD>
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</DL>
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<HR>
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<A NAME="useWeakValues()"><!-- --></A><H3>
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useWeakValues</H3>
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<PRE>
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public boolean <B>useWeakValues</B>()</PRE>
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<DL>
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<DD>Return whether or not this table's values are weak.
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<P>
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<DD><DL>
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</DL>
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</DD>
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<DD><DL>
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</DL>
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</DD>
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</DL>
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<HR>
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<A NAME="toLuaValue()"><!-- --></A><H3>
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toLuaValue</H3>
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<PRE>
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public <A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A> <B>toLuaValue</B>()</PRE>
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<DL>
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<DD>Return this metatable as a LuaValue.
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<P>
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<DD><DL>
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</DL>
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</DD>
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<DD><DL>
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</DL>
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</DD>
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</DL>
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<HR>
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<A NAME="entry(org.luaj.vm2.LuaValue, org.luaj.vm2.LuaValue)"><!-- --></A><H3>
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entry</H3>
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<PRE>
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public org.luaj.vm2.LuaTable.Slot <B>entry</B>(<A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A> key,
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<A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A> value)</PRE>
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<DL>
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<DD>Return an instance of Slot appropriate for the given key and value.
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<P>
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<DD><DL>
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</DL>
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</DD>
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<DD><DL>
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</DL>
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</DD>
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</DL>
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<HR>
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<A NAME="weaken(org.luaj.vm2.LuaValue)"><!-- --></A><H3>
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weaken</H3>
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<PRE>
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protected static <A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A> <B>weaken</B>(<A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A> value)</PRE>
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<DL>
|
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<DD>Self-sent message to convert a value to its weak counterpart
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<P>
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<DD><DL>
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</DL>
|
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</DD>
|
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<DD><DL>
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<DT><B>Parameters:</B><DD><CODE>value</CODE> - value to convert
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<DT><B>Returns:</B><DD><A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2"><CODE>LuaValue</CODE></A> that is a strong or weak reference, depending on type of <code>value</code></DL>
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</DD>
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</DL>
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<HR>
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<A NAME="strengthen(java.lang.Object)"><!-- --></A><H3>
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strengthen</H3>
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<PRE>
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protected static <A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A> <B>strengthen</B>(java.lang.Object ref)</PRE>
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<DL>
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<DD>Unwrap a LuaValue from a WeakReference and/or WeakUserdata.
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<P>
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<DD><DL>
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</DL>
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</DD>
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<DD><DL>
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<DT><B>Parameters:</B><DD><CODE>ref</CODE> - reference to convert
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<DT><B>Returns:</B><DD>LuaValue or null<DT><B>See Also:</B><DD><A HREF="../../../org/luaj/vm2/WeakTable.html#weaken(org.luaj.vm2.LuaValue)"><CODE>weaken(LuaValue)</CODE></A></DL>
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<A NAME="wrap(org.luaj.vm2.LuaValue)"><!-- --></A><H3>
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wrap</H3>
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<PRE>
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public <A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A> <B>wrap</B>(<A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A> value)</PRE>
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<DL>
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<DD>Returns the given value wrapped in a weak reference if appropriate.
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<P>
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<DD><DL>
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</DL>
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</DD>
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<A NAME="arrayget(org.luaj.vm2.LuaValue[], int)"><!-- --></A><H3>
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arrayget</H3>
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<PRE>
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public <A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A> <B>arrayget</B>(<A HREF="../../../org/luaj/vm2/LuaValue.html" title="class in org.luaj.vm2">LuaValue</A>[] array,
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int index)</PRE>
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<DL>
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<DD>Returns the value at the given index in the array, or null if it is a weak reference that
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has been dropped.
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<P>
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