File: ac_cxx_partial_ordering.html

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
 <head>
  <title>
   Autoconf Macro: ac_cxx_partial_ordering
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  <h1>
   ac_cxx_partial_ordering
  </h1>
  <h2>
   Synopsis
  </h2>
  <p class="indent" style="white-space:nowrap;">
   <code>AC_CXX_PARTIAL_ORDERING</code>
  </p>
  <h2>
   Description
  </h2>
  <div class="indent">
   <p>
    If the compiler supports partial ordering, define HAVE_PARTIAL_ORDERING.
   </p>
  </div>
  <h2>
   Authors
  </h2>
  <p class="indent">
   Todd Veldhuizen and Luc Maisonobe &lt;luc@spaceroots.org&gt;.
  </p>
  <h2>
   Last Modified
  </h2>
  <p class="indent">
   2004-02-04
  </p>
  <h2>
   M4 Source Code
  </h2>
  <div class="indent">
   <pre class="m4source">
AC_DEFUN([AC_CXX_PARTIAL_ORDERING],
[AC_CACHE_CHECK(whether the compiler supports partial ordering,
ac_cv_cxx_partial_ordering,
[AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE([
template&lt;int N&gt; struct I {};
template&lt;class T&gt; struct A
{  int r;
   template&lt;class T1, class T2&gt; int operator() (T1, T2)       { r = 0; return r; }
   template&lt;int N1, int N2&gt;     int operator() (I&lt;N1&gt;, I&lt;N2&gt;) { r = 1; return r; }
};],[A&lt;float&gt; x, y; I&lt;0&gt; a; I&lt;1&gt; b; return x (a,b) + y (float(), double());],
 ac_cv_cxx_partial_ordering=yes, ac_cv_cxx_partial_ordering=no)
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_partial_ordering" = yes; then
  AC_DEFINE(HAVE_PARTIAL_ORDERING,,
            [define if the compiler supports partial ordering])
fi
])
</pre>
  </div>
  <h2>
   License
  </h2>
  <div class="indent">
   <span style="white-space:nowrap;">Copyright &copy; 2004 Todd
   Veldhuizen</span><br>
   <span style="white-space:nowrap;">Copyright &copy; 2004 Luc Maisonobe
   &lt;luc@spaceroots.org&gt;</span>
   <p>
    Copying and distribution of this file, with or without modification, are
    permitted in any medium without royalty provided the copyright notice and
    this notice are preserved.
   </p>
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