71 lines
4.4 KiB
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71 lines
4.4 KiB
HTML
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<TITLE>CLHS: Function STREAM-ELEMENT-TYPE</TITLE>
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<A NAME="stream-element-type"><I>Function</I> <B>STREAM-ELEMENT-TYPE</B></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>stream-element-type</B> <I>stream</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>stream</I>---a <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>stream</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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<A REL=DEFINITION HREF="#stream-element-type"><B>stream-element-type</B></A> returns a <A REL=DEFINITION HREF="26_glo_t.htm#type_specifier"><I>type specifier</I></A> that indicates the <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>types</I></A> of <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>objects</I></A> that may be read from or written to <I>stream</I>. <P>
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<A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>Streams</I></A> created by <A REL=DEFINITION HREF="f_open.htm#open"><B>open</B></A> have an <A REL=DEFINITION HREF="26_glo_e.htm#element_type"><I>element type</I></A> restricted to <A REL=DEFINITION HREF="t_intege.htm#integer"><B>integer</B></A> or a <A REL=DEFINITION HREF="26_glo_s.htm#subtype"><I>subtype</I></A> of <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <A REL=DEFINITION HREF="t_ch.htm#character"><B>character</B></A>. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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;; Note that the stream must accomodate at least the specified type,
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;; but might accomodate other types. Further note that even if it does
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;; accomodate exactly the specified type, the type might be specified in
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;; any of several ways.
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(with-open-file (s "test" :element-type '(integer 0 1)
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:if-exists :error
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:direction :output)
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(stream-element-type s))
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=> INTEGER
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OR=> (UNSIGNED-BYTE 16)
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OR=> (UNSIGNED-BYTE 8)
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OR=> BIT
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OR=> (UNSIGNED-BYTE 1)
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OR=> (INTEGER 0 1)
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OR=> (INTEGER 0 (2))
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</PRE>
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</TT> <P>
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<P><B>Side Effects:</B> None.
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<P>
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<P><B>Affected By:</B> None.
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<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 <I>stream</I> is not a <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>stream</I></A>. <P>
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<P><B>See Also:</B> None.
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<P>
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<P><B>Notes:</B> None.
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<P>
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