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item about Borland C++ dislike for objects in ternary operator added

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3871 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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Vadim Zeitlin
1999-10-07 16:02:11 +00:00
parent 2b37dc19c5
commit 00ded55423
1 changed files with 20 additions and 0 deletions
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docs/html/standard.htm
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@@ -50,6 +50,7 @@ C++ portability guide</A> by David Williams.
<LI><A HREF="#no_stl">Don't use STL</A></LI> <LI><A HREF="#no_stl">Don't use STL</A></LI>
<LI><A HREF="#no_fordecl">Don't declare variables inside <TT>for()</TT></A></LI> <LI><A HREF="#no_fordecl">Don't declare variables inside <TT>for()</TT></A></LI>
<LI><A HREF="#no_nestedclasses">Don't use nested classes</A></LI> <LI><A HREF="#no_nestedclasses">Don't use nested classes</A></LI>
<LI><A HREF="#no_ternarywithobjects">Use ternary operator ?: carefully</A></LI>
</OL> </OL>
<BR> <BR>
<LI>General recommendations</LI> <LI>General recommendations</LI>
@@ -332,6 +333,25 @@ you can try the following:
<P>A nice side effect is that you don't need to recompile all the files <P>A nice side effect is that you don't need to recompile all the files
including the header if you change the PrivateLibClass declaration (it's including the header if you change the PrivateLibClass declaration (it's
an example of a more general interface/implementation separation idea). an example of a more general interface/implementation separation idea).
<P><LI><A NAME="no_ternarywithobjects"></A><B>Use ternary operator ?: carefully</B></LI><P>
The ternary operator <TT>?:</TT> shouldn't be used with objects (i.e. if any
of its operands are objects) because some compilers (notable Borland C++) fail
to compile such code.
<P><U>Workaround</U>: use <TT>if/else</TT> instead.
<PRE>
wxString s1, s2;
// Borland C++ won't compile the line below
wxString s = s1.Len() < s2.Len() ? s1 : s2;
// but any C++ compiler will compile this
wxString s;
if ( s1.Len() < s2.Len() )
s = s1;
else
s = s2;
</PRE>
</OL> </OL>
<BR> <BR>