6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-08-17 05:29:24 +00:00
Code Issues Projects Releases Wiki Activity

Add a note about endl semantics

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1502 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-01-20 19:01:26 +00:00
parent 304e707e8e
commit 13c4659220
1 changed files with 15 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
docs/CodingStandards.html
View File

@ -37,6 +37,7 @@
<ol>
<li><a href="#hl_assert">Assert Liberally</a>
<li><a href="#hl_preincrement">Prefer Preincrement</a>
<li><a href="#hl_avoidendl">Avoid endl</a>
<li><a href="#hl_exploitcpp">Exploit C++ to its Fullest</a>
</ol>
<li><a href="#iterators">Writing Iterators</a>
@ -292,6 +293,19 @@ Hard fast rule: Preincrement (++X) may be no slower than postincrement (X++) and
The semantics of postincrement include making a copy of the value being incremented, returning it, and then preincrementing the "work value". For primitive types, this isn't a big deal... but for iterators, it can be a huge issue (for example, some iterators contains stack and set objects in them... copying an iterator could invoke the copy ctor's of these as well). In general, get in the habit of always using preincrement, and you won't have a problem.<p>
<!-- _______________________________________________________________________ -->
</ul><a name="hl_avoidendl"><h4><hr size=0>Avoid endl</h4><ul>
The <tt>endl</tt> modifier, when used with iostreams outputs a newline to the output stream specified. In addition to doing this, however, it also flushes the output stream. In other words, these are equivalent:<p>
<pre>
cout << endl;
cout << "\n" << flush;
</pre>
Most of the time, you probably have no reason to flush the output stream, so it's better to use a literal <tt>"\n"</tt>.<p>
<!-- _______________________________________________________________________ -->
</ul><a name="hl_exploitcpp"><h4><hr size=0>Exploit C++ to its Fullest</h4><ul>
@ -646,7 +660,7 @@ If you get some free time, and you haven't read them: do so, you might learn som
<address><a href="mailto:sabre@nondot.org">Chris Lattner</a></address>
<!-- Created: Tue Jan 23 15:19:28 CST 2001 -->
<!-- hhmts start -->
Last modified: Mon Oct 1 15:33:40 CDT 2001
Last modified: Sun Jan 20 13:01:02 CST 2002
<!-- hhmts end -->
</font>
</body></html>