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Added example of how to code print() methods so that they will disappear

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from the code if "cnull" is passed into them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32641 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2006-12-17 11:40:40 +00:00
parent f2174da713
commit b0a9d1b9bc
1 changed files with 18 additions and 5 deletions
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docs/CodingStandards.html
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@ -509,7 +509,7 @@ library. There are two problems with this:</p>
more pressure on the VM system on low-memory machines.</li>
</ol>
<table>
<table align="center">
<tbody>
<tr>
<th>Old Way</th>
@ -520,8 +520,10 @@ library. There are two problems with this:</p>
<td align="left"><pre>#include "llvm/Support/Streams.h"</pre></td>
</tr>
<tr>
<td align="left"><pre>DEBUG(std::cerr &lt;&lt; ...);</pre></td>
<td align="left"><pre>DOUT &lt;&lt; ...;</pre></td>
<td align="left"><pre>DEBUG(std::cerr &lt;&lt; ...);
DEBUG(dump(std::cerr));</pre></td>
<td align="left"><pre>DOUT &lt;&lt; ...;
dump(DOUT);</pre></td>
</tr>
<tr>
<td align="left"><pre>std::cerr &lt;&lt; "Hello world\n";</pre></td>
@ -535,6 +537,12 @@ library. There are two problems with this:</p>
<td align="left"><pre>std::cin &gt;&gt; Var;</pre></td>
<td align="left"><pre>llvm::cin &gt;&gt; Var;</pre></td>
</tr>
<tr>
<td align="left"><em>N/A</em></td>
<td align="left"><pre>llvm::cnull &gt;&gt; Var;</pre>
<ul><i>N.B.</i> Eats up argument <tt>Var</tt> outputting
nothing.</ul></td>
</tr>
<tr>
<td align="left"><pre>std::ostream</pre></td>
<td align="left"><pre>llvm::OStream</pre></td>
@ -552,9 +560,14 @@ library. There are two problems with this:</p>
// ...
print(std::cerr);</pre></td>
<td align="left"><pre>void print(std::ostream &Out);
void print(std::ostream *Out) { if (Out) print(*Out) }
// ...
print(*llvm::cerr.stream());</pre></td>
</tbody>
print(llvm::cerr);</pre>
<ul><i>N.B.</i> The second <tt>print</tt> method is called by the <tt>print</tt>
expression. It prevents the execution of the first <tt>print</tt> method if the
stream is <tt>cnull</tt>.</ul></td>
</tbody>
</table>
</div>