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[m6w6/libmemcached] / m4 / pandora_shared_ptr.m4
1 dnl Copyright (C) 2009 Sun Microsystems
2 dnl This file is free software; Sun Microsystems
3 dnl gives unlimited permission to copy and/or distribute it,
4 dnl with or without modifications, as long as this notice is preserved.
5
6 dnl We check two things: where is the memory include file, and in what
7 dnl namespace does shared_ptr reside.
8 dnl We include AC_COMPILE_IFELSE for all the combinations we've seen in the
9 dnl wild:
10 dnl
11 dnl GCC 4.3: namespace: std:: #include <memory>
12 dnl GCC 4.2: namespace: tr1:: #include <tr1/memory>
13 dnl GCC 4.2: namespace: boost:: #include <boost/shared_ptr.hpp>
14 dnl
15 dnl We define one of HAVE_HAVE_TR1_SHARED_PTR or HAVE_BOOST_SHARED_PTR
16 dnl depending on location, and SHARED_PTR_NAMESPACE to be the namespace in
17 dnl which shared_ptr is defined.
18 dnl
19
20 AC_DEFUN([PANDORA_SHARED_PTR],[
21 AC_REQUIRE([PANDORA_CHECK_CXX_STANDARD])
22 AC_LANG_PUSH(C++)
23 AC_CHECK_HEADERS(memory tr1/memory boost/shared_ptr.hpp)
24 AC_CACHE_CHECK([the location of shared_ptr header file],
25 [ac_cv_shared_ptr_h],[
26 for namespace in std tr1 std::tr1 boost
27 do
28 AC_COMPILE_IFELSE(
29 [AC_LANG_PROGRAM([[
30 #if defined(HAVE_MEMORY)
31 # include <memory>
32 #endif
33 #if defined(HAVE_TR1_MEMORY)
34 # include <tr1/memory>
35 #endif
36 #if defined(HAVE_BOOST_SHARED_PTR_HPP)
37 # include <boost/shared_ptr.hpp>
38 #endif
39 #include <string>
40
41 using $namespace::shared_ptr;
42 using namespace std;
43 ]],[[
44 shared_ptr<string> test_ptr(new string("test string"));
45 ]])],
46 [
47 ac_cv_shared_ptr_namespace="${namespace}"
48 break
49 ],[ac_cv_shared_ptr_namespace=missing])
50 done
51 ])
52 AC_DEFINE_UNQUOTED([SHARED_PTR_NAMESPACE],
53 ${ac_cv_shared_ptr_namespace},
54 [The namespace in which SHARED_PTR can be found])
55 AC_LANG_POP()
56 ])