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<DIV>HI,</DIV>
<DIV> </DIV>
<DIV>I found some wiki about "#pragma once" compiler support</DIV>
<DIV><A 
href="http://en.wikipedia.org/wiki/Pragma_once#Portability">http://en.wikipedia.org/wiki/Pragma_once#Portability</A> 
</DIV>
<DIV> </DIV>
<DIV>http://en.wikipedia.org/wiki/Pragma_once#Portability </DIV>
<DIV>
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    class=headerSort title="Sort ascending">#pragma once</TH></TR></THEAD>
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    <TD 
    style="BORDER-BOTTOM: rgb(170,170,170) 1px solid; BORDER-LEFT: rgb(170,170,170) 1px solid; PADDING-BOTTOM: 0.2em; PADDING-LEFT: 0.2em; PADDING-RIGHT: 0.2em; BORDER-TOP: rgb(170,170,170) 1px solid; BORDER-RIGHT: rgb(170,170,170) 1px solid; PADDING-TOP: 0.2em"><A 
      style="BACKGROUND-IMAGE: none; COLOR: rgb(11,0,128); TEXT-DECORATION: none" 
      title=Clang href="http://en.wikipedia.org/wiki/Clang">Clang</A></TD>
    <TD 
    style="BORDER-BOTTOM: rgb(170,170,170) 1px solid; BORDER-LEFT: rgb(170,170,170) 1px solid; PADDING-BOTTOM: 0.2em; PADDING-LEFT: 0.2em; PADDING-RIGHT: 0.2em; BORDER-TOP: rgb(170,170,170) 1px solid; BORDER-RIGHT: rgb(170,170,170) 1px solid; PADDING-TOP: 0.2em">Supported<SUP 
      style="LINE-HEIGHT: 1em; FONT-STYLE: normal; FONT-WEIGHT: normal" 
      id=cite_ref-7 class=reference><A 
      style="BACKGROUND-IMAGE: none; WHITE-SPACE: nowrap; COLOR: rgb(11,0,128); TEXT-DECORATION: none" 
      href="http://en.wikipedia.org/wiki/Pragma_once#cite_note-7"><SPAN>[</SPAN>7<SPAN>]</SPAN></A></SUP></TD></TR>
  <TR>
    <TD 
    style="BORDER-BOTTOM: rgb(170,170,170) 1px solid; BORDER-LEFT: rgb(170,170,170) 1px solid; PADDING-BOTTOM: 0.2em; PADDING-LEFT: 0.2em; PADDING-RIGHT: 0.2em; BORDER-TOP: rgb(170,170,170) 1px solid; BORDER-RIGHT: rgb(170,170,170) 1px solid; PADDING-TOP: 0.2em"><A 
      style="BACKGROUND-IMAGE: none; COLOR: rgb(11,0,128); TEXT-DECORATION: none" 
      title="Comeau C/C++" 
      href="http://en.wikipedia.org/wiki/Comeau_C/C%2B%2B">Comeau C/C++</A></TD>
    <TD 
    style="BORDER-BOTTOM: rgb(170,170,170) 1px solid; BORDER-LEFT: rgb(170,170,170) 1px solid; PADDING-BOTTOM: 0.2em; PADDING-LEFT: 0.2em; PADDING-RIGHT: 0.2em; BORDER-TOP: rgb(170,170,170) 1px solid; BORDER-RIGHT: rgb(170,170,170) 1px solid; PADDING-TOP: 0.2em">Supported<SUP 
      style="LINE-HEIGHT: 1em; FONT-STYLE: normal; FONT-WEIGHT: normal" 
      id=cite_ref-8 class=reference><A 
      style="BACKGROUND-IMAGE: none; WHITE-SPACE: nowrap; COLOR: rgb(11,0,128); TEXT-DECORATION: none" 
      href="http://en.wikipedia.org/wiki/Pragma_once#cite_note-8"><SPAN>[</SPAN>8<SPAN>]</SPAN></A></SUP></TD></TR>
  <TR>
    <TD 
    style="BORDER-BOTTOM: rgb(170,170,170) 1px solid; BORDER-LEFT: rgb(170,170,170) 1px solid; PADDING-BOTTOM: 0.2em; PADDING-LEFT: 0.2em; PADDING-RIGHT: 0.2em; BORDER-TOP: rgb(170,170,170) 1px solid; BORDER-RIGHT: rgb(170,170,170) 1px solid; PADDING-TOP: 0.2em"><A 
      style="BACKGROUND-IMAGE: none; COLOR: rgb(165,88,88); TEXT-DECORATION: none" 
      class=new title="Digital Mars C++ (page does not exist)" 
      href="http://en.wikipedia.org/w/index.php?title=Digital_Mars_C%2B%2B&action=edit&redlink=1">Digital 
      Mars C++</A></TD>
    <TD 
    style="BORDER-BOTTOM: rgb(170,170,170) 1px solid; BORDER-LEFT: rgb(170,170,170) 1px solid; PADDING-BOTTOM: 0.2em; PADDING-LEFT: 0.2em; PADDING-RIGHT: 0.2em; BORDER-TOP: rgb(170,170,170) 1px solid; BORDER-RIGHT: rgb(170,170,170) 1px solid; PADDING-TOP: 0.2em">Supported<SUP 
      style="LINE-HEIGHT: 1em; FONT-STYLE: normal; FONT-WEIGHT: normal" 
      id=cite_ref-9 class=reference><A 
      style="BACKGROUND-IMAGE: none; WHITE-SPACE: nowrap; COLOR: rgb(11,0,128); TEXT-DECORATION: none" 
      href="http://en.wikipedia.org/wiki/Pragma_once#cite_note-9"><SPAN>[</SPAN>9<SPAN>]</SPAN></A></SUP></TD></TR>
  <TR>
    <TD 
    style="BORDER-BOTTOM: rgb(170,170,170) 1px solid; BORDER-LEFT: rgb(170,170,170) 1px solid; PADDING-BOTTOM: 0.2em; PADDING-LEFT: 0.2em; PADDING-RIGHT: 0.2em; BORDER-TOP: rgb(170,170,170) 1px solid; BORDER-RIGHT: rgb(170,170,170) 1px solid; PADDING-TOP: 0.2em"><A 
      style="BACKGROUND-IMAGE: none; COLOR: rgb(11,0,128); TEXT-DECORATION: none" 
      title="GNU Compiler Collection" 
      href="http://en.wikipedia.org/wiki/GNU_Compiler_Collection">GCC</A></TD>
    <TD 
    style="BORDER-BOTTOM: rgb(170,170,170) 1px solid; BORDER-LEFT: rgb(170,170,170) 1px solid; PADDING-BOTTOM: 0.2em; PADDING-LEFT: 0.2em; PADDING-RIGHT: 0.2em; BORDER-TOP: rgb(170,170,170) 1px solid; BORDER-RIGHT: rgb(170,170,170) 1px solid; PADDING-TOP: 0.2em">Supported<SUP 
      style="LINE-HEIGHT: 1em; FONT-STYLE: normal; FONT-WEIGHT: normal" 
      id=cite_ref-10 class=reference><A 
      style="BACKGROUND-IMAGE: none; WHITE-SPACE: nowrap; COLOR: rgb(11,0,128); TEXT-DECORATION: none" 
      href="http://en.wikipedia.org/wiki/Pragma_once#cite_note-10"><SPAN>[</SPAN>10<SPAN>]</SPAN></A></SUP></TD></TR>
  <TR>
    <TD 
    style="BORDER-BOTTOM: rgb(170,170,170) 1px solid; BORDER-LEFT: rgb(170,170,170) 1px solid; PADDING-BOTTOM: 0.2em; PADDING-LEFT: 0.2em; PADDING-RIGHT: 0.2em; BORDER-TOP: rgb(170,170,170) 1px solid; BORDER-RIGHT: rgb(170,170,170) 1px solid; PADDING-TOP: 0.2em"><A 
      style="BACKGROUND-IMAGE: none; COLOR: rgb(11,0,128); TEXT-DECORATION: none" 
      title="Intel C++ Compiler" 
      href="http://en.wikipedia.org/wiki/Intel_C%2B%2B_Compiler">Intel C++ 
      Compiler</A></TD>
    <TD 
    style="BORDER-BOTTOM: rgb(170,170,170) 1px solid; BORDER-LEFT: rgb(170,170,170) 1px solid; PADDING-BOTTOM: 0.2em; PADDING-LEFT: 0.2em; PADDING-RIGHT: 0.2em; BORDER-TOP: rgb(170,170,170) 1px solid; BORDER-RIGHT: rgb(170,170,170) 1px solid; PADDING-TOP: 0.2em">Supported<SUP 
      style="LINE-HEIGHT: 1em; FONT-STYLE: normal; FONT-WEIGHT: normal" 
      id=cite_ref-11 class=reference><A 
      style="BACKGROUND-IMAGE: none; WHITE-SPACE: nowrap; COLOR: rgb(11,0,128); TEXT-DECORATION: none" 
      href="http://en.wikipedia.org/wiki/Pragma_once#cite_note-11"><SPAN>[</SPAN>11<SPAN>]</SPAN></A></SUP></TD></TR>
  <TR>
    <TD 
    style="BORDER-BOTTOM: rgb(170,170,170) 1px solid; BORDER-LEFT: rgb(170,170,170) 1px solid; PADDING-BOTTOM: 0.2em; PADDING-LEFT: 0.2em; PADDING-RIGHT: 0.2em; BORDER-TOP: rgb(170,170,170) 1px solid; BORDER-RIGHT: rgb(170,170,170) 1px solid; PADDING-TOP: 0.2em"><A 
      style="BACKGROUND-IMAGE: none; COLOR: rgb(11,0,128); TEXT-DECORATION: none" 
      class=mw-redirect title="Microsoft Visual C++" 
      href="http://en.wikipedia.org/wiki/Microsoft_Visual_C%2B%2B">Microsoft 
      Visual C++</A></TD>
    <TD 
    style="BORDER-BOTTOM: rgb(170,170,170) 1px solid; BORDER-LEFT: rgb(170,170,170) 1px solid; PADDING-BOTTOM: 0.2em; PADDING-LEFT: 0.2em; PADDING-RIGHT: 0.2em; BORDER-TOP: rgb(170,170,170) 1px solid; BORDER-RIGHT: rgb(170,170,170) 1px solid; PADDING-TOP: 0.2em">Supported<SUP 
      style="LINE-HEIGHT: 1em; FONT-STYLE: normal; FONT-WEIGHT: normal" 
      id=cite_ref-12 class=reference><A 
      style="BACKGROUND-IMAGE: none; WHITE-SPACE: nowrap; COLOR: rgb(11,0,128); TEXT-DECORATION: none" 
      href="http://en.wikipedia.org/wiki/Pragma_once#cite_note-12"><SPAN>[</SPAN>12<SPAN>]</SPAN></A></SUP></TD></TR>
  <TR>
    <TD 
    style="BORDER-BOTTOM: rgb(170,170,170) 1px solid; BORDER-LEFT: rgb(170,170,170) 1px solid; PADDING-BOTTOM: 0.2em; PADDING-LEFT: 0.2em; PADDING-RIGHT: 0.2em; BORDER-TOP: rgb(170,170,170) 1px solid; BORDER-RIGHT: rgb(170,170,170) 1px solid; PADDING-TOP: 0.2em"><A 
      style="BACKGROUND-IMAGE: none; COLOR: rgb(165,88,88); TEXT-DECORATION: none" 
      class=new title="C++Builder XE3 (page does not exist)" 
      href="http://en.wikipedia.org/w/index.php?title=C%2B%2BBuilder_XE3&action=edit&redlink=1">C++Builder 
      XE3</A></TD>
    <TD 
    style="BORDER-BOTTOM: rgb(170,170,170) 1px solid; BORDER-LEFT: rgb(170,170,170) 1px solid; PADDING-BOTTOM: 0.2em; PADDING-LEFT: 0.2em; PADDING-RIGHT: 0.2em; BORDER-TOP: rgb(170,170,170) 1px solid; BORDER-RIGHT: rgb(170,170,170) 1px solid; PADDING-TOP: 0.2em">Supported<SUP 
      style="LINE-HEIGHT: 1em; FONT-STYLE: normal; FONT-WEIGHT: normal" 
      id=cite_ref-13 class=reference><A 
      style="BACKGROUND-IMAGE: none; WHITE-SPACE: nowrap; COLOR: rgb(11,0,128); TEXT-DECORATION: none" 
      href="http://en.wikipedia.org/wiki/Pragma_once#cite_note-13"><SPAN>[</SPAN>13<SPAN>]</SPAN></A></SUP></TD></TR></TBODY></TABLE></DIV>
<DIV> </DIV>
<DIV><A 
href="http://stackoverflow.com/questions/10990488/how-to-include-header-files-more-clearly-in-c/10990521#10990521">http://stackoverflow.com/questions/10990488/how-to-include-header-files-more-clearly-in-c/10990521#10990521</A> 
</DIV>
<DIV> </DIV>
<DIV>Thanks,</DIV>
<DIV> </DIV>
<DIV> </DIV>
<HR style="WIDTH: 210px; HEIGHT: 1px" align=left color=#b5c4df SIZE=1>

<DIV><SPAN>vincent</SPAN></DIV>
<DIV> </DIV>
<DIV 
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<DIV 
style="PADDING-BOTTOM: 8px; PADDING-LEFT: 8px; PADDING-RIGHT: 8px; BACKGROUND: #efefef; COLOR: #000000; FONT-SIZE: 12px; PADDING-TOP: 8px">
<DIV><B>From:</B> <A href="mailto:tml@iki.fi">Tor Lillqvist</A></DIV>
<DIV><B>Date:</B> 2013-03-19 13:51</DIV>
<DIV><B>To:</B> <A href="mailto:nthiebaud@gmail.com">Norbert 
Thiebaud</A></DIV>
<DIV><B>CC:</B> <A 
href="mailto:libreoffice@lists.freedesktop.org">libreoffice</A>; <A 
href="mailto:l.lunak@suse.cz">Lubos Lunak</A></DIV>
<DIV><B>Subject:</B> Re: #ifdef vs #if for feature checks</DIV></DIV></DIV>
<DIV>
<DIV>> otoh, #pragma once is supported by all the compiler we use isn't it ?</DIV>
<DIV> </DIV>
<DIV>Excellent! Let's do that, unless somebody comes up with a</DIV>
<DIV>counter-argument in a week or so.</DIV>
<DIV> </DIV>
<DIV>--tml</DIV>
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