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| -rw-r--r-- | docs/ACE-guidelines.html | 17 |
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diff --git a/docs/ACE-guidelines.html b/docs/ACE-guidelines.html index 52c5e0cc96f..cfe40056943 100644 --- a/docs/ACE-guidelines.html +++ b/docs/ACE-guidelines.html @@ -149,6 +149,23 @@ bgcolor="#ffffff"> const ASYS_TCHAR *net_if, #endif /* ! ACE_PSOS */ </pre><p> + + <li>Protect header files against multiple inclusion with this + construct: + <pre> + #ifndef FOO_H + #define FOO_H + + [contents of header file] + + #endif /* FOO_H */ + </pre><p> + + This exact construct (note the <code>#ifndef</code>) + is optimized by many compilers such they only open the + file once per compilation unit. <strong>No</strong> code + can appear after the final <code>#endif</code> for the + optimization to be effective and correct.<p> </ul> <li><strong>C++ Syntax and Constructs</strong><p> |