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# ==============================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cxx_have_koenig_lookup.html
# ==============================================================================
#
# SYNOPSIS
#
# AX_CXX_HAVE_KOENIG_LOOKUP
#
# DESCRIPTION
#
# Define CXX_HAVE_KOENIG_LOOKUP if the C++ compiler has argument-dependent
# name lookup (a.k.a. Koenig lookup).
#
# LICENSE
#
# Copyright (c) 2008 Steve M. Robbins <smr@debian.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. This file is offered as-is, without any
# warranty.
#serial 9
AU_ALIAS([MNI_CXX_HAVE_KOENIG_LOOKUP], [AX_CXX_HAVE_KOENIG_LOOKUP])
AC_DEFUN([AX_CXX_HAVE_KOENIG_LOOKUP],
[AC_CACHE_CHECK(whether the compiler implements Koenig lookup,
ax_cv_cxx_have_koenig_lookup,
[AC_LANG_PUSH(C++)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
namespace N1 {
class C {};
void f1(const C& c) {}
}
namespace N2 {
void f2() {
N1::C x;
f1(x); // resolves to N1::f1() if we have Koenig lookup,
// otherwise this will fail to compile.
}
}
]], [])],
[ax_cv_cxx_have_koenig_lookup=yes],
[ax_cv_cxx_have_koenig_lookup=no])
AC_LANG_POP])
if test "$ax_cv_cxx_have_koenig_lookup" = yes; then
AC_DEFINE(CXX_HAVE_KOENIG_LOOKUP,1,
[define to 1 if the compiler implements Koenig lookup])
fi
])
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