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<title>CLiki: Issue PRINTING-ARRAYS-READABLY</title>
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<span class="hidden">CLiki - Issue PRINTING-ARRAYS-READABLY</span>
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<div id="content"><div id="content-area"><div id="article-title">Issue PRINTING-ARRAYS-READABLY</div><div id="article"><a href="Issue.html" class="category">Issue</a>: PRINTING-ARRAYS-READABLY<p>Forum: Editorial<p>References: <a href="https://www.cliki.net/site/HyperSpec/Body/var_stprint-readablyst.html" class="hyperspec">*PRINT-READABLY*</a>, <a href="https://www.cliki.net/site/HyperSpec/Body/sec_22-1-3-7.html">CLHS 22.1.3.7</a>, <a href="https://www.cliki.net/site/HyperSpec/Body/sec_22-1-3-8.html">CLHS 22.1.3.8</a><p>Category: CLARIFICATION/CHANGE<p>Edit history: 2004-07-20, Version 1 by Bruno Haible<p>Status: For CLiki consideration<p><dl>
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<dt>Problem Description:<p></dt>
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<dd>The description of <a href="https://www.cliki.net/site/HyperSpec/Body/var_stprint-readablyst.html" class="hyperspec">*PRINT-READABLY*</a> says that throwing a <a href="https://www.cliki.net/site/HyperSpec/Body/contyp_print-not-readable.html" class="hyperspec">PRINT-NOT-READABLE</a> error is allowed for certain arrays. <a href="http://www.cliki.net/site/HyperSpec/Body/sec_22-1-3-7.html">CLHS 22.1.3.7</a> seems to imply that no error is allowed. This should probably be clarified one way or the other.<p></dd>
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<dt>Proposal (PRINTING-ARRAYS-READABLY:NO-ERROR):<p></dt>
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<dd>Add a sentence to 22.1.3.7: "If *print-readably* is true ... Any vector can be printed readably without signaling an error of type PRINT-NOT-READABLE if all its elements can be printed readably without signaling an error of type PRINT-NOT-READABLE."
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And similarly to 22.1.3.8: "If *print-readably* is true ... Any array can be printed readably without signaling an error of type PRINT-NOT-READABLE if all its elements can be printed readably without signaling an error of type PRINT-NOT-READABLE."<p></dd>
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<dt>Test case:<p></dt>
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<dd>(write (make-array '(3 0 5) :element-type '(unsigned-byte 8)) :readably t)<p></dd>
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<dt>Rationale:<p></dt>
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<dd>The implementation should ensure that it can print arrays readably.<p></dd>
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<dt>Current practice:<p></dt>
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<dd>
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<a href="CLISP.html" class="internal">CLISP</a> supports proposal NO-ERROR. <a href="SBCL.html" class="internal">SBCL</a> doesn't.<p></dd>
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<dt>Cost to Implementors:<p></dt>
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<dd>Define a way to print arrays readably, including when the element-type is not t, or when one of the dimensions is 0.<p></dd>
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<dt>Cost to Users:<p></dt>
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<dd>None.<p></dd>
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<dt>Cost of Non-Adoption:<p></dt>
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<dd>
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<a href="https://www.cliki.net/site/HyperSpec/Body/var_stprint-readablyst.html" class="hyperspec">*PRINT-READABLY*</a> is less useful.<p></dd>
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<dt>Benefits:<p></dt>
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<dd>Makes <a href="https://www.cliki.net/site/HyperSpec/Body/var_stprint-readablyst.html" class="hyperspec">*PRINT-READABLY*</a> more useful.<p></dd>
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<dt>Aesthetics:<p><dt>Discussion:
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</dt>
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</dt>
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<dd>
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<ul>
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<li>Bruno Haible supports proposal NO-ERROR.
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</li>
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</ul><p></dd>
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