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64 lines
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<TITLE>CLHS: Function ARRAY-ELEMENT-TYPE</TITLE>
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<A NAME="array-element-type"><I>Function</I> <B>ARRAY-ELEMENT-TYPE</B></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>array-element-type</B> <I>array</I> => <I>typespec</I><P>
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<P>
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<P><B>Arguments and Values:</B><P>
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<P>
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<I>array</I>---an <A REL=DEFINITION HREF="26_glo_a.htm#array"><I>array</I></A>. <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>Description:</B><P>
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<P>
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Returns a <A REL=DEFINITION HREF="26_glo_t.htm#type_specifier"><I>type specifier</I></A> which represents the <A REL=DEFINITION HREF="26_glo_a.htm#actual_array_element_type"><I>actual array element type</I></A> of the array, which is the set of <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>objects</I></A> that such an <I>array</I> can hold. (Because of <A REL=DEFINITION HREF="26_glo_a.htm#array"><I>array</I></A> <I>upgrading</I>, this <A REL=DEFINITION HREF="26_glo_t.htm#type_specifier"><I>type specifier</I></A> can in some cases denote a <A REL=DEFINITION HREF="26_glo_s.htm#supertype"><I>supertype</I></A> of the <A REL=DEFINITION HREF="26_glo_e.htm#expressed_array_element_type"><I>expressed array element type</I></A> of the <I>array</I>.) <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(array-element-type (make-array 4)) => T
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(array-element-type (make-array 12 :element-type '(unsigned-byte 8)))
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=> <A REL=DEFINITION HREF="26_glo_i.htm#implementation-dependent">implementation-dependent</A>
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(array-element-type (make-array 12 :element-type '(unsigned-byte 5)))
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=> <A REL=DEFINITION HREF="26_glo_i.htm#implementation-dependent">implementation-dependent</A>
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</PRE>
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</TT> <P>
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<PRE>
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(array-element-type (make-array 5 :element-type '(mod 5)))
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</PRE>
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</TT> could be <TT>(mod 5)</TT>, <TT>(mod 8)</TT>, <TT>fixnum</TT>, <TT>t</TT>, or any other type of which <TT>(mod 5)</TT> is a <A REL=DEFINITION HREF="26_glo_s.htm#subtype"><I>subtype</I></A>. <P>
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<P><B>Affected By:</B><P>
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<P>
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The <A REL=DEFINITION HREF="26_glo_i.htm#implementation"><I>implementation</I></A>. <P>
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<P><B>Exceptional Situations:</B><P>
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<P>
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Should signal an error of <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <A REL=DEFINITION HREF="e_tp_err.htm#type-error"><B>type-error</B></A> if its argument is not an <A REL=DEFINITION HREF="26_glo_a.htm#array"><I>array</I></A>. <P>
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<P><B>See Also:</B><P>
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<P>
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<A REL=DEFINITION HREF="t_array.htm#array"><B>array</B></A>, <A REL=DEFINITION HREF="f_mk_ar.htm#make-array"><B>make-array</B></A>, <A REL=DEFINITION HREF="f_subtpp.htm#subtypep"><B>subtypep</B></A>, <A REL=DEFINITION HREF="f_upgr_1.htm#upgraded-array-element-type"><B>upgraded-array-element-type</B></A> <P>
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<P><B>Notes:</B> None.
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<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/iss015.htm">ARRAY-TYPE-ELEMENT-TYPE-SEMANTICS:UNIFY-UPGRADING</A><P></UL><HR>
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