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dnl Copyright (C) 2009 Sun Microsystems, Inc.
dnl This file is free software; Sun Microsystems, Inc.
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl We check two things: where is the memory include file, and in what
dnl namespace does shared_ptr reside.
dnl We include AC_COMPILE_IFELSE for all the combinations we've seen in the
dnl wild:
dnl
dnl GCC 4.3: namespace: std:: #include <memory>
dnl GCC 4.2: namespace: tr1:: #include <tr1/memory>
dnl GCC 4.2: namespace: boost:: #include <boost/shared_ptr.hpp>
dnl
dnl We define one of HAVE_HAVE_TR1_SHARED_PTR or HAVE_BOOST_SHARED_PTR
dnl depending on location, and SHARED_PTR_NAMESPACE to be the namespace in
dnl which shared_ptr is defined.
dnl
AC_DEFUN([PANDORA_SHARED_PTR],[
AC_REQUIRE([PANDORA_CHECK_CXX_STANDARD])
AC_LANG_PUSH(C++)
save_CXXFLAGS="${CXXFLAGS}"
CXXFLAGS="${CXX_STANDARD} ${CXXFLAGS}"
AC_CHECK_HEADERS(memory tr1/memory boost/shared_ptr.hpp)
AC_CACHE_CHECK([the location of shared_ptr header file],
[ac_cv_shared_ptr_h],[
for namespace in std tr1 std::tr1 boost
do
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[
#if defined(HAVE_MEMORY)
# include <memory>
#endif
#if defined(HAVE_TR1_MEMORY)
# include <tr1/memory>
#endif
#if defined(HAVE_BOOST_SHARED_PTR_HPP)
# include <boost/shared_ptr.hpp>
#endif
#include <string>
using $namespace::shared_ptr;
using namespace std;
]],[[
shared_ptr<string> test_ptr(new string("test string"));
]])],
[
ac_cv_shared_ptr_namespace="${namespace}"
break
],[ac_cv_shared_ptr_namespace=missing])
done
])
AC_DEFINE_UNQUOTED([SHARED_PTR_NAMESPACE],
${ac_cv_shared_ptr_namespace},
[The namespace in which SHARED_PTR can be found])
CXXFLAGS="${save_CXXFLAGS}"
AC_LANG_POP()
])
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