<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <HTML> <HEAD> <META NAME="GENERATOR" CONTENT="SGML-Tools 1.0.9"> <TITLE> {The S-lang C Library Reference}: SLang_is_defined</TITLE> <LINK HREF="cref-80.html" REL=next> <LINK HREF="cref-78.html" REL=previous> <LINK HREF="cref.html#toc79" REL=contents> </HEAD> <BODY> <A HREF="cref-80.html">Next</A> <A HREF="cref-78.html">Previous</A> <A HREF="cref.html#toc79">Contents</A> <HR> <H2><A NAME="SLang_is_defined"></A> <A NAME="s79">79. <B>SLang_is_defined</B></A></H2> <P> <DL> <DT><B> Synopsis </B><DD><P>Check to see if the interpreter defines an object <DT><B> Usage </B><DD><P><CODE>int SLang_is_defined (char *nm)</CODE> <DT><B> Description </B><DD><P>The <CODE>SLang_is_defined</CODE> function may be used to determine whether or not a variable or function whose name is given by <CODE>em</CODE> has been defined. It returns zero if no such object has been defined. Othewise it returns a non-zero value whose meaning is given by the following table: <BLOCKQUOTE><CODE> <PRE> 1 intrinsic function (SLANG_INTRINSIC) 2 user-defined slang function (SLANG_FUNCTION) -1 intrinsic variable (SLANG_IVARIABLE) -2 user-defined global variable (SLANG_GVARIABLE) </PRE> </CODE></BLOCKQUOTE> <DT><B> See Also </B><DD><P><CODE>SLadd_intrinsic_function, SLang_run_hooks, SLang_execute_function</CODE> </DL> <P> <P> <P> <HR> <A HREF="cref-80.html">Next</A> <A HREF="cref-78.html">Previous</A> <A HREF="cref.html#toc79">Contents</A> </BODY> </HTML>