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Autoconf Macro: mni_cxx_have_koenig_lookup
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<h1>
mni_cxx_have_koenig_lookup
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>mni_CXX_HAVE_KOENIG_LOOKUP</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
Define CXX_HAVE_KOENIG_LOOKUP if the C++ compiler has argument-dependent
name lookup (a.k.a. Koenig lookup).
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Steve Robbins
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2001-09-20
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([mni_CXX_HAVE_KOENIG_LOOKUP],
[AC_CACHE_CHECK(whether the compiler implements Koenig lookup,
ac_cv_cxx_have_koenig_lookup,
[AC_LANG_PUSH(C++)
AC_TRY_COMPILE([
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.
}
}
],[],
ac_cv_cxx_have_koenig_lookup=yes,
ac_cv_cxx_have_koenig_lookup=no)
AC_LANG_POP])
if test "$ac_cv_cxx_have_koenig_lookup" = yes; then
AC_DEFINE(CXX_HAVE_KOENIG_LOOKUP,1,
[define to 1 if the compiler implements Koenig lookup])
fi
])
</pre>
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