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# We check two things: where is the memory include file, and in what
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# namespace does shared_ptr reside.
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# We include AC_COMPILE_IFELSE for all the combinations we've seen in the
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# GCC 4.3: namespace: std:: #include <memory>
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# GCC 4.2: namespace: tr1:: #include <tr1/memory>
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# GCC 4.2: namespace: boost:: #include <boost/shared_ptr.hpp>
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# We define one of HAVE_HAVE_TR1_SHARED_PTR or HAVE_BOOST_SHARED_PTR
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# depending on location, and SHARED_PTR_NAMESPACE to be the namespace in
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# which shared_ptr is defined.
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AC_DEFUN([AC_CXX_SHARED_PTR],[
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AC_REQUIRE([AC_CXX_CHECK_STANDARD])
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AC_CHECK_HEADERS(memory tr1/memory boost/shared_ptr.hpp)
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AC_CACHE_CHECK([the location of shared_ptr header file],
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[ac_cv_shared_ptr_h],[
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for namespace in std tr1 std::tr1 boost
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#if defined(HAVE_MEMORY)
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#if defined(HAVE_TR1_MEMORY)
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# include <tr1/memory>
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#if defined(HAVE_BOOST_SHARED_PTR_HPP)
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# include <boost/shared_ptr.hpp>
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using $namespace::shared_ptr;
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shared_ptr<string> test_ptr(new string("test string"));
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ac_cv_shared_ptr_namespace="${namespace}"
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],[ac_cv_shared_ptr_namespace=no])
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if test "$ac_cv_shared_ptr_namespace" = no
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AC_MSG_WARN([a usable shared_ptr implementation was not found. Let someone know what your platform is.])
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dnl AC_MSG_WARN([a usable shared_ptr implementation is required. If you are on Solaris, please install boost, either via pkg install boost, or pkg-get -i boost. If you are elsewhere, please file a bug])
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AC_DEFINE_UNQUOTED([SHARED_PTR_NAMESPACE],
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${ac_cv_shared_ptr_namespace},
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[The namespace in which SHARED_PTR can be found])