blob: 47494bbb5d7d7769535cbbce25a11b3883b905d1 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
# ===========================================================================
# http://autoconf-archive.cryp.to/mni_cxx_have_koenig_lookup.html
# ===========================================================================
#
# SYNOPSIS
#
# mni_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.
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
])
|
