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for security reasons, one cannot change the tag of a udata

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from Lua.
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Roberto Ierusalimschy
1997-06-27 19:38:49 -03:00
parent 20a48a818f
commit ef3c45d523
2 changed files with 9 additions and 9 deletions
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14
manual.tex
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@@ -1,4 +1,4 @@
% $Id: manual.tex,v 2.6 1997/06/26 20:39:10 roberto Exp roberto $
% $Id: manual.tex,v 2.7 1997/06/27 18:39:34 roberto Exp roberto $
\documentstyle[fullpage,11pt,bnf]{article}
@@ -38,7 +38,7 @@ Waldemar Celes
\tecgraf\ --- Computer Science Department --- PUC-Rio
}
\date{\small \verb$Date: 1997/06/26 20:39:10 $}
\date{\small \verb$Date: 1997/06/27 18:39:34 $}
\maketitle
@@ -263,7 +263,7 @@ values of type userdata and table can have
as many different tags as needed \see{tag-method}.
Tags are created with the function \verb|newtag|,
and the function \verb|tag| returns the tag of a given value.
To change the tag of a given userdata or table,
To change the tag of a given table,
there is the function \verb|settag| \see{pdf-newtag}.
@@ -1723,12 +1723,12 @@ This function allows Lua to test the tag of a value \see{TypesSec}.
It receives one argument, and returns its tag (a number).
\verb|tag| is equivalent to the API function \verb|lua_tag|.
\subsubsection*{\ff {\tt settag (o, tag)}}\Deffunc{settag}
This function sets the tag of a given object \see{TypesSec}.
The object \verb|o| must be a userdata or a table.
\subsubsection*{\ff {\tt settag (t, tag)}}\Deffunc{settag}
This function sets the tag of a given table \see{TypesSec}.
\verb|tag| must be a value created with \verb|newtag|
\see{pdf-newtag}.
\verb|settag| is equivalent to the API function \verb|lua_settag|.
For security reasons,
it is impossible to change the tag of a userdata from Lua.
\subsubsection*{\ff {\tt assert (v)}}\Deffunc{assert}
This function issues an {\em ``assertion failed!''} error