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# ===========================================================================
# http://autoconf-archive.cryp.to/ac_cxx_partial_ordering.html
# ===========================================================================
#
# SYNOPSIS
#
# AC_CXX_PARTIAL_ORDERING
#
# DESCRIPTION
#
# If the compiler supports partial ordering, define HAVE_PARTIAL_ORDERING.
#
# LICENSE
#
# Copyright (c) 2008 Todd Veldhuizen
# Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org>
#
# 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.
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<int N> struct I {};
template<class T> struct A
{ int r;
template<class T1, class T2> int operator() (T1, T2) { r = 0; return r; }
template<int N1, int N2> int operator() (I<N1>, I<N2>) { r = 1; return r; }
};],[A<float> x, y; I<0> a; I<1> 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
])
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