Macro: ac_cxx_partial_ordering

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Synopsis

  `AC_CXX_PARTIAL_ORDERING`

Version

  1.1.1.1 (2001/07/26) C++_Support @ ac-archive-0.5.39

Author

  Luc Maisonobe

Description

  If the compiler supports partial ordering, define HAVE_PARTIAL_ORDERING.

M4 Source Code

      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
      ])