~drizzle-trunk/drizzle/development

dnl  Copyright (C) 2009 Sun Microsystems

dnl This file is free software; Sun Microsystems

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()

])