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Viewing changes to m4source/mni_cxx_have_koenig_lookup.m4

  • Committer: Bazaar Package Importer
  • Author(s): Martin A. Godisch
  • Date: 2004-06-26 09:43:57 UTC
  • Revision ID: james.westby@ubuntu.com-20040626094357-3be3jwcz1vcdhpe8
Tags: upstream-20040616
Import upstream version 20040616

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m4source/mni_cxx_have_koenig_lookup.m4
 
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dnl Available from the GNU Autoconf Macro Archive at:
 
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dnl http://www.gnu.org/software/ac-archive/htmldoc/mni_cxx_have_koenig_lookup.html
 
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dnl
 
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AC_DEFUN([mni_CXX_HAVE_KOENIG_LOOKUP],
 
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    [AC_CACHE_CHECK(whether the compiler implements Koenig lookup,
 
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                    ac_cv_cxx_have_koenig_lookup,
 
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                    [AC_LANG_PUSH(C++)
 
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                     AC_TRY_COMPILE([
 
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    namespace N1 {
 
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        class C {};
 
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        void f1(const C& c) {}
 
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    }
 
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    namespace N2 {
 
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        void f2() {
 
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            N1::C x;
 
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            f1(x);     // resolves to N1::f1() if we have Koenig lookup,
 
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                       // otherwise this will fail to compile.
 
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        }
 
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    }
 
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    ],[],
 
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                     ac_cv_cxx_have_koenig_lookup=yes,
 
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                     ac_cv_cxx_have_koenig_lookup=no)
 
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                     AC_LANG_POP])
 
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    if test "$ac_cv_cxx_have_koenig_lookup" = yes; then
 
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        AC_DEFINE(CXX_HAVE_KOENIG_LOOKUP,1,
 
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                  [define to 1 if the compiler implements Koenig lookup])
 
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    fi
 
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])