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43 lines
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<TITLE>CLHS: Type Specifier OR</TITLE>
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<A NAME="or"><I>Type Specifier</I> <B>OR</B></A> <P>
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<P><B>Compound Type Specifier Kind:</B><P>
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<P>
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Combining. <P>
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<P><B>Compound Type Specifier Syntax:</B><P>
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<B>or</B> <I><I>typespec</I><B>*</B></I><P>
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<P>
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<P><B>Compound Type Specifier Arguments:</B><P>
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<P>
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<I>typespec</I>---a <A REL=DEFINITION HREF="26_glo_t.htm#type_specifier"><I>type specifier</I></A>. <P>
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<P><B>Compound Type Specifier Description:</B><P>
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<P>
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This denotes the set of all <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>objects</I></A> of the <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> determined by the union of the <I>typespecs</I>. For example, the <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <A REL=DEFINITION HREF="t_list.htm#list"><B>list</B></A> by definition is the same as <TT>(or null cons)</TT>. Also, the value returned by <A REL=DEFINITION HREF="f_pos_p.htm#position"><B>position</B></A> is an <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>object</I></A> of <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <TT>(or null (integer 0 *))</TT>; i.e., either <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A> or a non-negative <A REL=DEFINITION HREF="26_glo_i.htm#integer"><I>integer</I></A>. <P>
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<A REL=DEFINITION HREF="a_st.htm#ST"><B>*</B></A> is not permitted as an argument. <P>
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The <A REL=DEFINITION HREF="26_glo_t.htm#type_specifier"><I>type specifiers</I></A> <TT>(or)</TT> and <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A> are equivalent. The symbol <A REL=DEFINITION HREF="#or"><B>or</B></A> is not valid as a <A REL=DEFINITION HREF="26_glo_t.htm#type_specifier"><I>type specifier</I></A>; and, specifically, it is not an abbreviation for <TT>(or)</TT>. <P>
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<P><HR>The following <A REL=META HREF="../Front/X3J13Iss.htm">X3J13 cleanup issue</A>, <I>not part of the specification</I>, applies to this section:<P><UL><LI> <A REL=CHILD HREF="../Issues/iss353.htm">TYPE-SPECIFIER-ABBREVIATION:X3J13-JUN90-GUESS</A><P></UL><HR>
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