AC_DEFUN([AC_CXX_FUNCTION_NONTYPE_PARAMETERS],

[AC_CACHE_CHECK(whether the compiler supports function templates with non-type parameters,

ac_cv_cxx_function_nontype_parameters,

[AC_LANG_SAVE

 AC_LANG_CPLUSPLUS

 AC_TRY_COMPILE([

template<class int="" n="" t,=""> class A {};</class>

template<class int="" n="" t,=""> int f(const A<t,n>& x) { return 0; }</t,n></class>

],[A<double, 17=""> z; return f(z);],</double,>

 ac_cv_cxx_function_nontype_parameters=yes, ac_cv_cxx_function_nontype_parameters=no)

 AC_LANG_RESTORE

])

if test "$ac_cv_cxx_function_nontype_parameters" = yes; then

  AC_DEFINE(HAVE_FUNCTION_NONTYPE_PARAMETERS,,

            [define if the compiler supports function templates with non-type parameters])

fi

])

AC_DEFUN([AC_CXX_NAMESPACES],

[AC_CACHE_CHECK(whether the compiler implements namespaces,

ac_cv_cxx_namespaces,

[AC_LANG_SAVE

 AC_LANG_CPLUSPLUS

 AC_TRY_COMPILE([namespace Outer { namespace Inner { int i = 0; }}],

                [using namespace Outer::Inner; return i;],

 ac_cv_cxx_namespaces=yes, ac_cv_cxx_namespaces=no)

 AC_LANG_RESTORE

])

if test "$ac_cv_cxx_namespaces" = yes; then

  AC_DEFINE(HAVE_NAMESPACES,,[define if the compiler implements namespaces])

fi

])

AC_DEFUN([AC_CXX_HAVE_COMPLEX],

[AC_CACHE_CHECK(whether the compiler has complex<t>,</t>

ac_cv_cxx_have_complex,

[AC_REQUIRE([AC_CXX_NAMESPACES])

 AC_LANG_SAVE

 AC_LANG_CPLUSPLUS

 AC_TRY_COMPILE([#include <complex></complex>

#ifdef HAVE_NAMESPACES

using namespace std;

#endif],[complex<float> a; complex<double> b; return 0;],</double></float>

 ac_cv_cxx_have_complex=yes, ac_cv_cxx_have_complex=no)

 AC_LANG_RESTORE

])

if test "$ac_cv_cxx_have_complex" = yes; then

  AC_DEFINE(HAVE_COMPLEX,,[define if the compiler has complex<t>])</t>

fi

])

AC_DEFUN([AC_CXX_HAVE_SSTREAM],

[AC_CACHE_CHECK(whether the compiler has stringstream,

ac_cv_cxx_have_sstream,

[AC_REQUIRE([AC_CXX_NAMESPACES])

 AC_LANG_SAVE

 AC_LANG_CPLUSPLUS

 AC_TRY_COMPILE([#include <sstream></sstream>

#ifdef HAVE_NAMESPACES

using namespace std;

#endif],[stringstream message; message << "Hello"; return 0;],

 ac_cv_cxx_have_sstream=yes, ac_cv_cxx_have_sstream=no)

 AC_LANG_RESTORE

])

if test "$ac_cv_cxx_have_sstream" = yes; then

  AC_DEFINE(HAVE_SSTREAM,,[define if the compiler has stringstream])

fi

])

AC_DEFUN([AC_CXX_MUTABLE],

[AC_CACHE_CHECK(whether the compiler supports the mutable keyword,

ac_cv_cxx_mutable,

[AC_LANG_SAVE

 AC_LANG_CPLUSPLUS

 AC_TRY_COMPILE([

class A { mutable int i;

          public:

          int f (int n) const { i = n; return i; }

        };

],[A a; return a.f (1);],

 ac_cv_cxx_mutable=yes, ac_cv_cxx_mutable=no)

 AC_LANG_RESTORE

])

if test "$ac_cv_cxx_mutable" = yes; then

  AC_DEFINE(HAVE_MUTABLE,,[define if the compiler supports the mutable keyword])

fi

])